CN115327648B - Doppler microwave detection method and device with detection boundary determination function - Google Patents
Doppler microwave detection method and device with detection boundary determination function Download PDFInfo
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- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
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Abstract
The invention provides a Doppler microwave detection method and a device with a determined detection boundary, wherein the Doppler microwave detection device with the determined detection boundary is provided with a first detection mode and a second detection mode, a corresponding antenna module emits continuous microwaves or pulse microwaves with fixed frequency in the first detection mode, and emits microwaves with variable frequency in a frequency sweeping or frequency hopping mode in the second detection mode so as to form an effective detection space with the determined detection boundary based on multiple limit values of corresponding Doppler intermediate frequency signals in frequency and initial phase, wherein the second detection mode is started only when corresponding target information is acquired based on the first detection mode, and the emission frequency in the first detection mode can be adjusted in a feedback mode so as to reduce the average power consumption of the Doppler microwave detection device with the determined detection boundary, ensure the detection accuracy of the Doppler microwave detection device and simultaneously ensure the anti-interference capability of the Doppler microwave detection device in the two detection modes.
Description
Technical Field
The invention relates to the field of Doppler microwave detection, in particular to a Doppler microwave detection method and device with a detection boundary determination function.
Background
With the development of the internet of things technology, the requirements of artificial intelligence, intelligent home and intelligent security technology on environment detection, especially on detection accuracy of motion characteristics of existence, movement and inching of people, are higher and higher, and accurate judgment basis can be provided for intelligent terminal equipment only by acquiring enough stable detection results. The radio technology, including the existing microwave detection technology based on the Doppler effect principle, has unique advantages in the technology of behavior detection and existence detection, and can transmit a microwave beam at a fixed frequency and receive a reflected echo formed by the reflection of the microwave beam by the corresponding object, and generate a Doppler intermediate frequency signal corresponding to the frequency difference between the microwave beam and the reflected echo in a subsequent mode through frequency mixing detection, then the amplitude fluctuation of the Doppler intermediate frequency signal corresponds to the Doppler effect generated by the motion of the corresponding object, thus representing the motion of the corresponding object based on the effective amplitude of the Doppler intermediate frequency signal meeting the corresponding threshold setting, and realizing the wide application prospect due to the intelligent interconnection between the human and the object when applied to the detection of human activities, on the one hand, the boundary of the corresponding microwave beam is a gradient boundary with a certain degree of radiation energy, on the other hand, the electromagnetic radiation is not deterministic, on the other hand, namely, the shaping means of the corresponding microwave beam boundary is used for shaping the electromagnetic radiation, the main gradient boundary is used for the electromagnetic interference, the detection is difficult to realize the electromagnetic interference of the corresponding microwave beam, the electromagnetic interference is not really matched with the actual condition of the corresponding object, and the real condition is not really realized, the space is not matched with the real condition of the real condition, and the space is not available, and the space is not matched with the real condition of the real condition exists, and the space is not available, the space is actually controlled, the space is not occupied by the detection conditions, the problems of poor precision and/or poor anti-interference performance of the existing microwave detection technology based on the Doppler effect principle are caused, namely, the boundary of the microwave beam is a gradient boundary where radiation energy is attenuated to a certain degree, and meanwhile, a shaping means for the gradient boundary of the microwave beam is lacked, so that the actual detection space of the existing microwave detection module is difficult to match with the corresponding target detection space in actual application, and the defect that the adaptability of the existing microwave detection module in different application scenes in actual application is limited and the detection stability is poor is caused.
In order to solve the above-mentioned drawbacks of the existing microwave detection module, an effective detection space is currently defined in an actual detection space of the microwave detection module mainly by adjusting the sensitivity of the microwave detection module, and specifically, the corresponding sensitivity adjustment of the microwave detection module is implemented by setting a corresponding threshold value of the doppler intermediate frequency signal in amplitude, so that the effective detection space can be matched with the target detection space based on the definition of the effective detection space in a scene that the actual detection space of the microwave detection module is larger than the corresponding target detection space, thereby excluding the environmental interference of the actual detection space outside the target detection space. However, since the amplitude of the doppler intermediate frequency signal is related to the energy level of the reflected echo formed by the reflection of the moving object and is also related to the reflecting surface level and the moving speed of the moving object and the distance from the microwave detection module, the definition of the effective detection space based on the sensitivity adjustment of the microwave detection module is not stable and accurate, for example, different moving objects with the same distance as the microwave detection module have different amplitude feedback in the doppler intermediate frequency signal due to different reflecting surface levels and/or moving speeds, and moving objects farther away from the microwave detection module may have higher amplitude feedback in the doppler intermediate frequency signal due to larger reflecting surfaces and/or moving speeds, i.e. the sensitivity adjustment of the microwave detection module cannot form the effective detection space with a determined boundary, so that the detection boundary of the microwave detection module in practical application is not accurate and stable.
That is, since the boundary of the microwave beam is a gradient boundary where radiation energy is attenuated to a certain extent, and a shaping means for the gradient boundary of the microwave beam is lacking, and the sensitivity adjustment of the microwave detection module based on the corresponding threshold setting of the doppler intermediate frequency signal in amplitude cannot form the effective detection space with a certain boundary, the current microwave detection technology based on the doppler effect principle has the defects of limited adaptability to different application scenarios in practical application and poor detection stability and accuracy.
Disclosure of Invention
An object of the present invention is to provide a method and apparatus for detecting doppler microwave with a defined detection boundary, wherein the method and apparatus for detecting doppler microwave with a defined detection boundary can form an effective detection space with a defined detection boundary in an actual detection space, and an accurate and stable detection result can be obtained based on the method and apparatus for detecting the activity of the effective detection space.
It is an object of the present invention to provide a doppler microwave detection method and apparatus with defined detection boundaries, wherein the boundaries of the effective detection space are allowed to be controllably adjusted based on corresponding circuit or program settings, i.e. the boundaries of the effective detection space can be adjusted to match the corresponding target detection space with adaptability to different application scenarios.
It is an object of the present invention to provide a doppler microwave detection method and apparatus with defined detection boundaries, wherein the boundaries of the active detection space are allowed to be controllably adjusted based on corresponding circuit or program settings, thus allowing accurate and stable detection results to be obtained for active detection of the target detection space based on the doppler microwave detection method and apparatus with defined detection boundaries by adjusting the boundaries of the active detection space to match the corresponding target detection space.
An object of the present invention is to provide a doppler microwave detection method and apparatus with a detection boundary determination, wherein the doppler microwave detection apparatus with a detection boundary determination comprises an antenna module, an oscillation module, a frequency mixing module, a control module and a frequency modulation module, and has a first detection mode and a second detection mode, wherein the oscillation module feeds the antenna module with a first excitation signal in the first detection mode and feeds the antenna module with a second excitation signal in the second detection mode, wherein the first excitation signal is a continuous signal or a pulse signal with a fixed frequency, wherein the second excitation signal is a signal with a varying frequency formed in a frequency sweep or a frequency hopping manner, wherein the frequency mixing module is electrically connected to the antenna module and the oscillation module, respectively, and generates a first doppler intermediate frequency signal by frequency mixing processing the signal received by the antenna module and the first excitation signal in the first detection mode, and generates a first doppler intermediate frequency signal by frequency mixing processing the signal received by the antenna module and the second intermediate frequency signal in the second detection mode, wherein the first excitation signal is a doppler intermediate frequency signal is generated by frequency mixing the first doppler intermediate frequency signal received by the antenna module and the second excitation signal in the second detection mode, wherein the frequency mixing module is electrically connected to the control module and the first frequency modulation module, respectively, and the frequency modulation module is electrically connected to the control module, and the control module is arranged to output, the oscillation module is configured to control the Doppler microwave detection device with the determined detection boundary to switch from the first detection mode to the second detection mode by outputting the second excitation signal in a frequency sweeping or frequency hopping mode according to the first frequency modulation control signal, and the average power consumption of the Doppler microwave detection device with the determined detection boundary can be reduced by switching from the first detection mode to the second detection mode when and only when the first Doppler intermediate frequency signal has first target information.
An object of the present invention is to provide a method and an apparatus for detecting doppler microwave with a detection boundary determination, in which the first excitation signal is a continuous signal or a pulse signal with a fixed frequency, the second excitation signal is a signal with a variable frequency formed by frequency sweeping or frequency hopping, and the accuracy of the doppler microwave detection apparatus with a detection boundary determination in the detection mode of human body activity can be ensured by further feeding back distance information between a detected object and the antenna module corresponding to the second doppler intermediate frequency signal relative to the first doppler intermediate frequency signal.
An object of the present invention is to provide a method and an apparatus for detecting doppler microwave with a detection boundary determination, and an object of the present invention is to provide a method and an apparatus for detecting doppler microwave with a detection boundary determination, wherein the control module is configured to output a pair of external control signals to the outside in the second detection mode according to the presence of second target information corresponding to the activity of a human body in the second doppler intermediate frequency signal, so as to intelligently control corresponding electrical devices based on the detection of the presence of the human body.
An object of the present invention is to provide a method and an apparatus for detecting doppler microwave with a defined detection boundary, wherein the control module is configured to start timing a period of time according to the generation of the first control signal, wherein the frequency modulation module is configured to stop outputting the first frequency modulation control signal to the oscillation module according to the end of the timing of the period of time, so as to control the oscillation module to output the first excitation signal to control the doppler microwave detection device with a defined detection boundary to switch from the second detection mode to the first detection mode, so as to reduce the working time of the doppler microwave detection device with a defined detection boundary in the second detection mode, and thus facilitate reducing the average power consumption of the doppler microwave detection device with a defined detection boundary.
An object of the present invention is to provide a method and an apparatus for doppler microwave detection with a detection boundary determination, wherein the control module is configured to output a second control signal to the frequency modulation module according to the absence of second target information of the second doppler intermediate frequency signal in the time period, wherein the frequency modulation module is configured to output a second frequency modulation control signal to the oscillation module according to the second control signal, wherein the oscillation module is configured to output the first excitation signal at another fixed frequency according to the second frequency modulation control signal, so as to avoid interference of microwave interference sources in the environment in the first detection mode.
An object of the present invention is to provide a method and an apparatus for doppler microwave detection with a detection boundary determination, wherein the control module includes a first target information extraction unit and a second target information extraction unit electrically connected to the mixing module at the same time, wherein the first target information extraction unit is configured to perform an extraction operation on the first target information in the first doppler intermediate frequency signal in the first detection mode, and output the first control signal to the frequency modulation module and the second target information extraction unit according to the first target information, respectively, and the second target information extraction unit is configured to perform an extraction operation on the second target information in the second doppler intermediate frequency signal according to the first control signal, so as to maintain the second target information extraction unit in a low power consumption state in the first detection mode, thereby being beneficial to further reducing average power consumption of the method and the apparatus for doppler microwave detection with a detection boundary determination.
An object of the present invention is to provide a method and an apparatus for detecting doppler microwave with a determined detection boundary, wherein in the second detection mode, the oscillation module outputs the second excitation signal in a piecewise chirped form according to the first frequency modulation control signal, then the frequency of the second doppler intermediate frequency signal is a discrete state of a difference between the frequencies of the second excitation signal and the signal received by the antenna module, and has at least one frequency component, the initial phase of the second doppler intermediate frequency signal is a discrete state of a difference between the phases of the second excitation signal and the signal received by the antenna module at a time point corresponding to a start point of the second doppler intermediate frequency signal of each frequency component, wherein a coverage space of a microwave beam transmitted by the antenna module is the actual detection space, then different frequency components of the second doppler intermediate frequency signal in a time domain signal form correspond to different distances between an object in the actual detection space, so that an upper limit value of the second doppler intermediate frequency signal can be set correspondingly in frequency, and an effective detection space can be defined according to the upper limit value, and the effective detection space can be defined according to the limit value, and the effective detection space can be defined.
An object of the present invention is to provide a method and an apparatus for detecting doppler microwave with a detection boundary determination, in which when there is motion of an object in the actual detection space, the frequency and the initial phase of the second doppler intermediate frequency signal have fluctuations in the time domain, so that the presence or absence of the second target information can accurately represent the presence or absence of the motion of the object in the effective detection space based on further limit setting of the frequency and/or the initial phase of the second doppler intermediate frequency signal by a lower frequency difference limit and/or a lower phase difference limit, corresponding to fluctuations of the second doppler intermediate frequency signal with a frequency component equal to or less than the upper frequency limit being equal to or fluctuations of the frequency component equal to or greater than the lower frequency difference limit being the second target information.
An object of the present invention is to provide a doppler microwave detection method and apparatus with a detection boundary determination, wherein the second doppler intermediate frequency signal of the frequency components of the second doppler intermediate frequency signal which are less than or equal to the upper frequency limit value is selected in a filtering manner to generate a range-doppler intermediate frequency signal, i.e. the range-doppler intermediate frequency signal characterizes the effective detection space only for the signal components of the second doppler intermediate frequency signal of the frequency components of the second doppler intermediate frequency signal which are less than or equal to the upper frequency limit value, so as to define the effective detection space based on setting of the upper frequency limit value by setting corresponding filtering parameters.
An object of the present invention is to provide a method and an apparatus for doppler microwave detection with a detection boundary determination, in which the range-doppler intermediate frequency signal is converted into a frequency fluctuation signal according to a time-dependent frequency change of the range-doppler intermediate frequency signal, and then an amplitude fluctuation of the frequency fluctuation signal corresponds to a frequency value fluctuation of the range-doppler intermediate frequency signal, so that when the second target information is the amplitude fluctuation of the frequency fluctuation signal which is greater than or equal to the lower frequency difference limit value, the presence or absence of the second target information can accurately represent the presence or absence of the object activity in the effective detection space.
An object of the present invention is to provide a doppler microwave detection method and apparatus having a detection boundary determination, in which a range-wise variation characteristic of an amplitude of the range-wise doppler intermediate frequency signal corresponds to a range-wise variation characteristic of a frequency value of the range-wise doppler intermediate frequency signal when the range-wise variation characteristic of the range-wise doppler intermediate frequency signal is converted into a range-wise variation signal in accordance with a range-wise variation of a frequency of the range-wise doppler intermediate frequency signal, that is, a range-wise variation characteristic of a distance between an object in the effective detection space and a corresponding antenna module, that is, a frequency of the range-wise variation signal corresponds to a movement frequency of the corresponding object, wherein the range-wise variation frequency of the range-wise variation signal is selected in a frequency range of 10Hz or less based on a filtering process of the range-wise variation signal, so that when the range-wise variation of the amplitude of the range-wise variation signal is the range-wise variation of the lower frequency difference limit value of the range-wise variation signal is the second target information, the second target information corresponds to an action frequency within a frequency range of 10Hz, and thus respiratory and cardiac detection of a human body in the effective detection space can be represented with a high probability, and thus the detection of human body in a stable electrical condition is performed, and the presence of a human body is controlled accordingly.
An object of the present invention is to provide a doppler microwave detection method and apparatus having a detection boundary determination, in which the range-doppler intermediate frequency signal is fourier transformed to obtain distribution information of frequency values of the range-doppler intermediate frequency signal of each frequency component in a time dimension, and the distribution information of the frequency values of the range-doppler intermediate frequency signal of each frequency component in the time dimension corresponds to fluctuation information of a distance between a corresponding object defined based on a range resolution and an antenna module in the effective detection space in the time dimension, so that the presence or absence of the second target information can accurately represent the presence or absence of an object activity in the effective detection space when the second target information is obtained by frequency value fluctuation equal to or greater than the lower frequency difference limit value in the distribution information of the frequency values of the range-doppler intermediate frequency signal of at least one frequency component in the time dimension.
It is an object of the present invention to provide a doppler microwave detection method and apparatus with defined detection boundaries, wherein the range-doppler intermediate frequency signal is fourier transformed to obtain distribution information of frequency values of the range-doppler intermediate frequency signal of each frequency component in a time dimension, the distribution information of the frequency values of the range-doppler intermediate frequency signal of each frequency component in the time dimension corresponds to fluctuation information of the distance between the corresponding object defined based on the range resolution and the antenna module in the effective detection space in the time dimension, i.e. the frequency of the frequency value fluctuations of the range-doppler intermediate frequency signal of the frequency components in the time dimension corresponds to the frequency of the movement of the respective object defined on the basis of the range resolution in the effective detection space, so as to have a frequency value fluctuation of the range-doppler intermediate frequency signal of at least one frequency component in the distribution information of the frequency value in the time dimension that is greater than or equal to the lower frequency difference limit value, and the frequency value of the range-doppler intermediate frequency signal of the frequency component has a fluctuation frequency in the time dimension of 10Hz or less and corresponds to an operation with an operation frequency in the frequency range of 10Hz, the second target information is obtained by using the frequency value fluctuation of the frequency value of the range-Doppler intermediate frequency signal of the frequency component in the time dimension, the second target information characterizes with a high probability the breathing and heartbeat actions of the human body in the effective detection space, and the distance between the human body and the corresponding antenna module can be determined corresponding to the frequency component, thus being suitable for accurately and stably detecting the existence of the human body and intelligently controlling corresponding electrical equipment based on the detection of the existence of the human body.
An object of the present invention is to provide a doppler microwave detection method and apparatus having a detection boundary determination, in which the range-doppler intermediate frequency signal is fourier transformed to obtain distribution information of an initial phase of the range-doppler intermediate frequency signal of each frequency component in a time dimension, and the distribution information of the initial phase of the range-doppler intermediate frequency signal of each frequency component in the time dimension corresponds to fluctuation information of a distance between an object corresponding to each frequency component and an antenna module in the effective detection space in the time dimension, so that the presence or absence of the second target information can accurately represent the presence or absence of an object activity in the effective detection space when the fluctuation of the initial phase of the range-doppler intermediate frequency signal of at least one frequency component in the distribution information in the time dimension is the second target information.
An object of the present invention is to provide a doppler microwave detection method and apparatus having a detection boundary determination, wherein, based on a periodic characteristic of a phase, when distribution information of a frequency value of the range-doppler intermediate frequency signal of a corresponding frequency component in a time dimension has a frequency value fluctuation equal to or greater than the lower limit frequency difference limit value, a feedback of the fluctuation of an initial phase of the range-doppler intermediate frequency signal of the frequency component in the time dimension to the fluctuation of a distance between an object corresponding to the frequency component and an antenna module in the time dimension has ambiguity, wherein fourier transformation is performed on the range-doppler intermediate frequency signal to obtain distribution information of a frequency value of the range-doppler intermediate frequency signal of each frequency component in the time dimension, and when the distribution information of a frequency value of the range-doppler intermediate frequency signal of at least one frequency component in the time dimension does not have a frequency value fluctuation equal to or greater than the lower limit frequency difference limit value, the phase of the range-doppler intermediate frequency signal of the frequency component in the initial phase is greater than the lower limit value in the time dimension, and the range-doppler intermediate frequency difference boundary determination method can be performed to determine a second phase difference information of the range-doppler intermediate frequency signal, and the microwave detection apparatus is able to accurately determine a phase difference boundary of the target in the time and the microwave detection boundary.
An object of the present invention is to provide a doppler microwave detection method and apparatus with a detection boundary determination, in which the range-doppler intermediate frequency signal is fourier transformed to obtain distribution information of frequency values of the range-doppler intermediate frequency signal of each frequency component in a time dimension, and to obtain distribution information of initial phases of the range-doppler intermediate frequency signal of each frequency component in the time dimension, wherein when the distribution information of frequency values of the range-doppler intermediate frequency signal of at least one frequency component in the time dimension does not have frequency value fluctuations equal to or greater than the lower frequency difference limit value, the distribution information of initial phases of the range-doppler intermediate frequency signal of the frequency component in the time dimension has non-ambiguity to feedback of the fluctuation of distances between an object corresponding to the frequency component and an antenna module in the time dimension, i.e. the frequency of fluctuation of the initial phase of the range-doppler intermediate frequency signal of the frequency component in the time dimension corresponds to the frequency of motion of the corresponding object defined based on the range resolution in the effective detection space, so that the distribution information of the initial phase of the range-doppler intermediate frequency signal of the frequency component in the time dimension has the phase fluctuation equal to the lower limit phase difference limit value, and the fluctuation frequency of the initial phase of the range-doppler intermediate frequency signal of the frequency component in the time dimension is less than or equal to the frequency range of 10Hz and corresponds to the motion of the motion frequency in the frequency range of 10Hz, the fluctuation of the initial phase of the range-doppler intermediate frequency signal of the frequency component in the time dimension is the second target information, the target information represents the respiration and the heartbeat motion of the human body in the effective detection space with a great probability, and a distance between the human body and the corresponding antenna module can be determined corresponding to the frequency component, thus being suitable for accurately and stably detecting the presence of the human body and intelligently controlling the corresponding electrical device based on the detection of the presence of the human body.
An object of the present invention is to provide a method and an apparatus for detecting doppler microwave with a detection boundary determination, in which, when the second doppler intermediate frequency signal is fourier transformed to obtain distribution information of frequency values of the second doppler intermediate frequency signal of each frequency component in a time dimension, the distribution information of the frequency values of the second doppler intermediate frequency signal of each frequency component in the time dimension corresponds to fluctuation information of a distance between a corresponding object defined based on a distance resolution and an antenna module in the actual detection space in the time dimension, so that presence or absence of the second target information can accurately represent presence or absence of an object activity in the effective detection space when frequency value fluctuation of the frequency value of the second doppler intermediate frequency signal in the time dimension of at least one frequency component smaller than or equal to the upper frequency limit value is the second target information.
An object of the present invention is to provide a method and apparatus for detecting doppler microwaves having a detection boundary, wherein the second doppler intermediate frequency signal is fourier transformed to obtain distribution information of frequency values of the second doppler intermediate frequency signal of each frequency component in a time dimension, the distribution information of the frequency values of the second doppler intermediate frequency signal of each frequency component in the time dimension corresponds to fluctuation information of a distance between a corresponding object defined based on a distance resolution and an antenna module in the actual detection space in the time dimension, that is, fluctuation frequency of frequency value fluctuation of the second doppler intermediate frequency signal of each frequency component in the time dimension corresponds to a motion frequency of a corresponding object defined based on a distance resolution in the actual detection space, such that the fluctuation of the frequency value of the second doppler intermediate frequency signal of at least one frequency component in the time dimension is greater than or equal to the lower frequency difference limit, and the fluctuation frequency of the frequency component in the time dimension is less than or equal to 10Hz, and the fluctuation frequency range of the frequency value fluctuation of the frequency component in the frequency dimension corresponds to a frequency range of 10Hz, the frequency range of the frequency value fluctuation of the frequency component in the frequency range corresponds to the frequency range of the frequency value fluctuation of the frequency component in the frequency range, the second doppler intermediate frequency component is thus applicable to a motion information of the second frequency component in the time dimension, the frequency range of the second doppler intermediate frequency component is more stable, and the motion information of the frequency component in the frequency range is determined to be motion information of the human body is more stable, and the motion information is detected in the human body is detected, and the motion information is more stable in the motion information that can be detected, and intelligently controlling the corresponding electrical device based on the detection of the presence of the human body.
An object of the present invention is to provide a method and an apparatus for detecting doppler microwave with a detection boundary determination, in which, when the second doppler intermediate frequency signal is fourier transformed to obtain distribution information of an initial phase of the second doppler intermediate frequency signal of each frequency component in a time dimension, the distribution information of the initial phase of the second doppler intermediate frequency signal of each frequency component in the time dimension corresponds to fluctuation information of a distance between an object corresponding to each frequency component and an antenna module in the actual detection space in the time dimension, so that a presence or absence of the second target information can accurately represent a presence or absence of an object activity in the effective detection space when a fluctuation of the initial phase of the second doppler intermediate frequency signal of at least one frequency component smaller than or equal to the upper frequency limit value in the distribution information of the initial phase of the second doppler intermediate frequency signal in the time dimension is the second target information.
An object of the present invention is to provide a method and an apparatus for detecting a doppler microwave with a detection boundary, in which the second doppler intermediate frequency signal is fourier transformed to obtain information about a distribution of a frequency value of the second doppler intermediate frequency signal in a time dimension of each frequency component, and to obtain information about a distribution of an initial phase of the second doppler intermediate frequency signal in a time dimension of each frequency component, and when the information about the distribution of the frequency value of the second doppler intermediate frequency signal in the time dimension of at least one frequency component that is less than or equal to the upper limit frequency limit value does not have a frequency value fluctuation that is greater than or equal to the lower limit frequency difference limit value, the information about the second target is used as the information about a phase fluctuation that is greater than or equal to the lower limit phase difference limit value in the distribution of the frequency component in the time dimension, and the second target information can accurately represent an activity of an object that exists in the effective detection space and corresponds to the frequency component based on a distance resolution, so as to improve the detection accuracy of the method and apparatus for detecting a doppler microwave with a detection boundary.
An object of the present invention is to provide a method and apparatus for detecting doppler microwave with a detection boundary determination, in which when at least one frequency component of the second doppler intermediate frequency signal has a frequency value fluctuation greater than or equal to the lower limit frequency difference limit value and/or an initial phase of the second doppler intermediate frequency signal of at least one frequency component has an initial phase fluctuation greater than or equal to the lower limit phase difference limit value, the upper limit frequency limit value is preset or reset for the upper limit frequency limit value by a minimum frequency component of the frequency components based on a setting instruction for the upper limit frequency limit value, so that the boundary setting of the effective detection space is simple and easy, and professional requirements for measuring and calculating the installation height of a corresponding antenna module can be avoided, thereby having better applicability.
An object of the present invention is to provide a method and an apparatus for detecting doppler microwave with a detection boundary determination, wherein at least two paths of second doppler intermediate frequency signals are formed based on the number of corresponding antenna modules, so that distribution position information of a moving object in the effective detection space can be obtained according to a corresponding relationship between the same moving object and corresponding frequency components of the two second doppler intermediate frequency signals, thereby being beneficial to intelligently controlling corresponding electrical devices based on detection of a human existence position.
According to one aspect of the present invention, there is provided a doppler microwave detection device having a determined detection boundary, the doppler microwave detection device having a first detection mode and a second detection mode, and comprising:
an antenna module, wherein a space covered by a microwave beam emitted by the antenna module is an actual detection space of the antenna module;
An oscillating module, wherein the oscillating module feeds the antenna module with a first excitation signal in the first detection mode and feeds the antenna module with a second excitation signal in the second detection mode, wherein the first excitation signal is a continuous signal or a pulse signal with a fixed frequency, wherein the second excitation signal is a signal with a varying frequency formed in a frequency sweep or a frequency hopping manner;
The frequency mixing module is electrically connected to the antenna module and the oscillation module respectively, and is used for mixing the signal received by the antenna module and the first excitation signal in the first detection mode to generate a first Doppler intermediate frequency signal, and mixing the signal received by the antenna module and the second excitation signal in the second detection mode to generate a second Doppler intermediate frequency signal;
A frequency modulation module; and
A control module, wherein the control module is electrically connected to the mixing module and the frequency modulation module, respectively, and outputs a first control signal to the frequency modulation module according to the first target information of the first Doppler intermediate frequency signal in the first detection mode, wherein the frequency modulation module is configured to output a first frequency modulation control signal to the oscillation module according to the first control signal, wherein the oscillation module is configured to output the second excitation signal according to the first frequency modulation control signal in a frequency sweeping or frequency hopping manner, so as to control the Doppler microwave detection device with a determined detection boundary to switch from the first detection mode to the second detection mode, the control module is arranged in the second detection mode and outputs a pair of external control signals according to the existence of second target information of the second Doppler intermediate frequency signal, wherein the second target information is frequency value fluctuation which is greater than or equal to a lower limit frequency difference limit value in the second Doppler intermediate frequency signal of frequency components which are smaller than or equal to an upper limit frequency limit value or initial phase fluctuation which is greater than or equal to a lower limit phase difference limit value in the second Doppler intermediate frequency signal of frequency components which are smaller than or equal to the upper limit frequency limit value, so that the outer boundary of an effective detection space is defined in the actual detection space based on the setting of the upper limit frequency limit value, and the feedback of the human/object activity in the effective detection space is used for intelligently controlling corresponding electrical equipment by the external control signals based on the second target information.
In an embodiment, the control module is further configured to start timing a time period according to the generation of the first control signal, wherein the frequency modulation module is configured to stop outputting the first frequency modulation control signal to the oscillation module according to the end of the time period to control the oscillation module to output the first excitation signal to control the doppler microwave detection device with the determined detection boundary to switch from the second detection mode back to the first detection mode.
In an embodiment, the control module is configured to output a second control signal to the frequency modulation module according to the absence of the second target signal of the second doppler intermediate frequency signal in the period of time, wherein the frequency modulation module is configured to output a second frequency modulation control signal to the oscillation module according to the second control signal, and wherein the oscillation module is configured to output the first excitation signal at another fixed frequency according to the second frequency modulation control signal.
In an embodiment, the control module includes a first target information extraction unit and a second target information extraction unit that are electrically connected to the mixing module at the same time, where the first target information extraction unit is configured to perform an extraction operation on first target information in the first doppler intermediate frequency signal in the first detection mode, and output the first control signal to the frequency modulation module and the second target information extraction unit according to the first target information, respectively, and the second target information extraction unit is configured to perform an extraction operation on second target information in the second doppler intermediate frequency signal according to the first control signal, so as to keep the second target information extraction unit in a low power consumption state in the first detection mode.
In an embodiment, the mixing module includes a mixing unit and a signal amplifying unit, where the mixing unit is electrically connected to the antenna module and the oscillating module, respectively, to mix the signal received by the antenna module and the first excitation signal in the first detection mode to generate the first doppler intermediate frequency signal, and mix the signal received by the antenna module and the second excitation signal in the second detection mode to generate the second doppler intermediate frequency signal, and the signal amplifying unit is electrically connected to the mixing unit, to amplify the first doppler intermediate frequency signal in the first detection mode and amplify the second doppler intermediate frequency amplified signal in the second detection mode.
In an embodiment, wherein the second target information extraction unit is arranged to select the second doppler intermediate frequency signal with a frequency component smaller than or equal to the upper frequency limit value in a frequency selective filtering manner to generate a range-doppler intermediate frequency signal, the range-doppler intermediate frequency signal only characterizes the effective detection space to define the effective detection space based on setting of the upper frequency limit value by setting of the respective filtering parameters.
In an embodiment, the second target information extracting unit is configured to convert the range-doppler intermediate frequency signal into a frequency fluctuation signal according to a time-dependent frequency change of the range-doppler intermediate frequency signal, and extract the second target information by using, as the second target information, amplitude fluctuation of the frequency fluctuation signal that is equal to or greater than the lower frequency difference limit value.
In an embodiment, the second target information extracting unit is further configured to obtain, by frequency selective filtering, the frequency fluctuation signal having a frequency range in which a frequency of amplitude fluctuation is less than or equal to 10Hz, and extract the second target information by using, as the second target information, amplitude fluctuation of the frequency fluctuation signal after the frequency selective filtering processing that is greater than or equal to the lower frequency difference limit value.
In an embodiment, the second target information extracting unit is configured to obtain distribution information of frequency values of the range-doppler intermediate frequency signal of each frequency component in a time dimension according to fourier transform of the range-doppler intermediate frequency signal, and extract the second target information by using frequency value fluctuation of at least one frequency component, which is greater than or equal to the lower frequency difference limit value, as the second target information.
In an embodiment, the second target information extraction unit is further configured to extract the second target information based on a condition that distribution information of frequency values of the range-doppler intermediate frequency signal of at least one frequency component in a time dimension has frequency value fluctuation of the lower limit frequency difference limit value or more, and a fluctuation frequency of the frequency values of the range-doppler intermediate frequency signal of the frequency component in the time dimension is less than or equal to a frequency range of 10 Hz.
In an embodiment, the second target information extracting unit is configured to obtain distribution information of an initial phase of the range-doppler intermediate frequency signal of each frequency component in a time dimension according to fourier transform of the range-doppler intermediate frequency signal, and extract the second target information with a fluctuation of the initial phase of the range-doppler intermediate frequency signal of at least one frequency component in the distribution information of the initial phase of the range-doppler intermediate frequency signal in the time dimension being equal to or greater than the lower limit phase difference limit value as the second target information.
In an embodiment, the second target information extracting unit is configured to obtain distribution information of frequency values of the range-doppler intermediate frequency signal of each frequency component in a time dimension in accordance with fourier transform of the range-doppler intermediate frequency signal, and obtain distribution information of initial phases of the range-doppler intermediate frequency signal of each frequency component in the time dimension, and extract the second target information based on at least one of a condition that the distribution information of the frequency values of the range-doppler intermediate frequency signal of at least one frequency component in the time dimension has a frequency value fluctuation equal to or greater than the lower frequency difference limit value, and a condition that the distribution information of the initial phases of the range-doppler intermediate frequency signal of at least one frequency component in the time dimension has a fluctuation equal to or greater than the lower frequency difference limit value.
In an embodiment, the second target information extracting unit is configured to extract the second target information based on a condition that distribution information of a frequency value of the range-doppler intermediate frequency signal of at least one frequency component in a time dimension does not have a frequency value fluctuation equal to or larger than the lower limit frequency difference limit value, and that distribution information of an initial phase of the range-doppler intermediate frequency signal of the frequency component in the time dimension has a fluctuation equal to or larger than the lower limit frequency difference limit value.
In an embodiment, the second target information extracting unit is configured to extract the second target information based on a condition that distribution information of a frequency value of the range-doppler intermediate frequency signal of at least one frequency component in a time dimension does not have a frequency value fluctuation of the lower limit frequency difference limit value or more, and distribution information of an initial phase of the range-doppler intermediate frequency signal of the frequency component in the time dimension has a fluctuation of the lower limit frequency difference limit value or more, and a frequency range of a fluctuation frequency of the initial phase of the range-doppler intermediate frequency signal of the frequency component in the time dimension is 10Hz or less.
In an embodiment, the second target information extracting unit is configured to obtain distribution information of frequency values of the second doppler intermediate frequency signal of each frequency component in a time dimension according to fourier transform of the second doppler intermediate frequency signal, and extract the second target information by using, as the second target information, frequency value fluctuation greater than or equal to the lower frequency difference limit value in the distribution information of the frequency values of the second doppler intermediate frequency signal of at least one frequency component smaller than or equal to the upper frequency limit value in the time dimension.
In an embodiment, the second target information extraction unit is further configured to extract the second target information based on a condition that distribution information of frequency values of the second doppler intermediate frequency signal of at least one frequency component that is equal to or less than the upper limit frequency limit value in a time dimension has frequency value fluctuation that is equal to or greater than the lower limit frequency difference limit value, and a frequency range in which a fluctuation frequency of the frequency values of the second doppler intermediate frequency signal of the frequency component in the time dimension is equal to or less than 10 Hz.
In an embodiment, the second target information extracting unit is configured to obtain distribution information of an initial phase of the second doppler intermediate frequency signal of each frequency component in a time dimension according to fourier transform of the second doppler intermediate frequency signal, and extract the second target information by using, as the second target information, a fluctuation greater than or equal to the lower limit phase difference limit value in the distribution information of the initial phase of the second doppler intermediate frequency signal of at least one frequency component less than or equal to the upper limit frequency limit value in the time dimension.
In an embodiment, wherein the second target information extraction unit is configured to extract the second target information based on at least one of a condition that the distribution information of the frequency value of the second doppler intermediate frequency signal of at least one frequency component that is equal to or less than the upper limit frequency limit value in the time dimension has a frequency value fluctuation that is equal to or greater than the lower limit frequency difference limit value and a condition that the distribution information of the initial phase of the second doppler intermediate frequency signal of at least one frequency component that is equal to or less than the upper limit frequency limit value in the time dimension has a fluctuation that is equal to or greater than the lower limit phase difference limit value in the time dimension, by acquiring the distribution information of the frequency value of the second doppler intermediate frequency signal of each frequency component in the time dimension in the fourier transform of the second doppler intermediate frequency signal.
In an embodiment, the second target information extracting unit is configured to extract the second target information on the condition that distribution information of the frequency value of the second doppler intermediate frequency signal of at least one frequency component that is equal to or less than the upper limit frequency limit value in the time dimension does not have frequency value fluctuation that is equal to or more than the lower limit frequency difference limit value, and distribution information of the initial phase of the second doppler intermediate frequency signal of the frequency component in the time dimension has phase fluctuation that is equal to or more than the lower limit frequency difference limit value.
In an embodiment, wherein the second target information extraction unit is configured to extract the second target information based on a condition that distribution information of a frequency value of the second doppler intermediate frequency signal of at least one frequency component that is equal to or less than the upper frequency limit value in a time dimension does not have a frequency value fluctuation that is equal to or greater than the lower frequency difference limit value, and distribution information of an initial phase of the second doppler intermediate frequency signal of the frequency component in the time dimension has a fluctuation that is equal to or greater than the lower frequency difference limit value, and a fluctuation frequency of the initial phase of the second doppler intermediate frequency signal of the frequency component in the time dimension is equal to or less than a frequency range of 10 Hz.
In an embodiment, the control module is configured to set the upper frequency limit value for the upper frequency limit value at one of a minimum frequency and a maximum frequency of at least one frequency component when the frequency value of the second doppler intermediate frequency signal of the frequency component has a frequency value fluctuation equal to or greater than the lower frequency limit value and/or the initial phase of the second doppler intermediate frequency signal of the at least one frequency component has an initial phase fluctuation equal to or greater than the lower frequency limit value based on an instruction to set the upper frequency limit value.
In an embodiment, wherein the control module is configured to set the upper frequency limit with a minimum frequency of at least one frequency component when the frequency value of the second doppler intermediate frequency signal of the frequency component has a frequency value fluctuation that is greater than or equal to the lower frequency difference limit and/or the initial phase of the second doppler intermediate frequency signal of the at least one frequency component has an initial phase fluctuation that is greater than or equal to the lower frequency difference limit based on the instruction to set the upper frequency limit.
According to another aspect of the present invention, there is also provided a doppler microwave detection method with a determination of a detection boundary, the doppler microwave detection method with a determination of a detection boundary comprising the steps of:
S1, an oscillation module feeds a first excitation signal with fixed frequency to an antenna module, and a mixing module mixes the signal received by the antenna module and the first excitation signal to generate a first Doppler intermediate frequency signal;
S2, a control module outputs a first control signal to a frequency modulation module according to first target information of the first Doppler intermediate frequency signal, and the frequency modulation module outputs a first frequency modulation control signal to the oscillation module according to the first control signal; and
S3, the oscillation module outputs the second excitation signal to feed the antenna module in a frequency sweeping or frequency hopping mode according to the first frequency modulation control signal, the corresponding antenna module emits a microwave beam in a frequency sweeping or frequency hopping mode, a coverage space of the microwave beam is used as an actual detection space, the mixing module mixes the signal received by the antenna module and the second excitation signal to generate a second Doppler intermediate frequency signal, the control module outputs a pair of external control signals outwards according to the existence of second target information of the second Doppler intermediate frequency signal, wherein the second target information is frequency value fluctuation which is greater than or equal to a lower limit frequency difference limit value or initial phase fluctuation which is greater than or equal to a lower limit phase difference limit value in the second Doppler intermediate frequency signal of a frequency component which is less than or equal to an upper limit frequency limit value, so that the effective detection space has a determined boundary based on the outer boundary of the upper limit frequency limit value which is set in the actual detection space, and feedback of human/object movement in the effective detection space based on the second target information is used for intelligently controlling the corresponding electrical equipment.
In an embodiment, in the step S3, the control module further starts timing a period of time according to the generation of the first control signal, wherein the frequency modulation module stops outputting the first frequency modulation control signal to the oscillation module according to the end of the timing of the period of time to control the oscillation module to output the first excitation signal and returns to the step S1.
In an embodiment, in the step S3, the control module outputs the second control signal to the frequency modulation module according to the absence of the second target signal of the second doppler intermediate frequency signal in the period, wherein the frequency modulation module outputs a second frequency modulation control signal to the oscillation module according to the second control signal, wherein the oscillation module outputs the first excitation signal at another fixed frequency according to the second frequency modulation control signal and returns to the step S1.
In an embodiment, the step S3 includes the following steps:
A. The oscillation module outputs the second excitation signal to feed the antenna module according to the first frequency modulation control signal piecewise linear frequency modulation;
B. the antenna module receives at least one reflected echo formed by the reflection of the microwave beam by at least one object in the actual detection space and generates an echo signal corresponding to the reflected echo;
C. The frequency mixing module generates the second Doppler intermediate frequency signal corresponding to the frequency and phase difference between the second excitation signal and the echo signal in a time domain signal form through a frequency mixing detection mode, the frequency of the second Doppler intermediate frequency signal is a discrete state of the frequency difference between the second excitation signal and each echo signal and has at least one frequency component, and the initial phase of the second Doppler intermediate frequency signal is a discrete state of a phase difference between the second excitation signal and the corresponding echo signal at a time point corresponding to the starting point of the second Doppler intermediate frequency signal of each frequency component;
D. Defining an outer boundary of the effective detection space in the actual detection space by using the upper limit frequency limit value based on the limit value setting of the second Doppler intermediate frequency signal in frequency; and
E. Based on the limit value setting of the second Doppler intermediate frequency signal in frequency and/or initial phase, frequency value fluctuation larger than or equal to the lower limit frequency difference limit value or initial phase fluctuation larger than or equal to the lower limit phase difference limit value in the second Doppler intermediate frequency signal of the frequency component smaller than or equal to the upper limit frequency limit value is taken as second target information, and the control module outputs the external control signal according to the existence of second target information of the second Doppler intermediate frequency signal, so that the corresponding electrical equipment is intelligently controlled by the external control signal based on the feedback of the second target information on the human/object activity in the effective detection space.
Further objects and advantages of the present invention will become fully apparent from the following description and the accompanying drawings.
These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description, the accompanying drawings and the appended claims.
Drawings
Fig. 1 is a schematic block diagram of a doppler microwave detection device with a detection boundary determination function according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a further structural block diagram of the doppler microwave detection device with the detection boundary determination according to the above embodiment of the present invention.
Fig. 3 is a schematic diagram of a portion of logic of a second detection mode of a doppler microwave detection method with detection boundary determination in a static environment according to an embodiment of the present invention.
Fig. 4 is a partial logic schematic diagram of a second detection mode of the doppler microwave detection method with a detection boundary determination according to the above embodiment of the present invention in a static environment.
Fig. 5 is a partial logic schematic diagram of a second detection mode with a doppler microwave detection method for determining a detection boundary according to the above embodiment of the present invention in a dynamic environment.
FIG. 6 is a graph of frequency versus time for a second excitation signal based on a different piecewise chirping scheme.
Fig. 7 is a logic diagram of a doppler microwave detection method with detection boundary determination in a second detection mode according to an embodiment of the present invention.
Fig. 8 is a logic diagram of a doppler microwave detection method with detection boundary determination in a second detection mode according to another embodiment of the present invention.
Fig. 9 is a logic diagram of a doppler microwave detection method with detection boundary determination in a second detection mode according to another embodiment of the present invention.
Fig. 10 is a logic diagram of a doppler microwave detection method with detection boundary determination in a second detection mode according to another embodiment of the present invention.
Fig. 11 is a logic diagram of a doppler microwave detection method with detection boundary determination in a second detection mode according to another embodiment of the present invention.
Fig. 12 is a logic diagram of a doppler microwave detection method with detection boundary determination in a second detection mode according to another embodiment of the present invention.
Figure 13 is a logic diagram of a method of doppler microwave detection with determination of detection boundaries in a second detection mode according to another embodiment of the present invention.
Fig. 14 is a schematic diagram of an application scenario of the doppler microwave detection method with detection boundary determination in the second detection mode according to the embodiments of the present invention.
Detailed Description
The following description is presented to enable one of ordinary skill in the art to make and use the invention. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be appreciated by those skilled in the art that in the present disclosure, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. refer to an orientation or positional relationship based on that shown in the drawings, which is merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore the above terms should not be construed as limiting the present invention.
It will be understood that the terms "a" and "an" should be interpreted as referring to "at least one" or "one or more," i.e., in one embodiment, the number of elements may be one, while in another embodiment, the number of elements may be plural, and the term "a" should not be interpreted as limiting the number.
The present invention provides a method and apparatus for doppler microwave detection with detection boundary determination, as shown in fig. 1 and 2 of the accompanying drawings, according to an embodiment of the present invention, a block diagram of a doppler microwave detection apparatus with detection boundary determination is illustrated, wherein the doppler microwave detection apparatus with detection boundary determination comprises an antenna module 10, an oscillation module 20, a frequency mixing module 30, a control module 40 and a frequency modulation module 50, and has a first detection mode and a second detection mode, wherein the oscillation module 20 feeds the antenna module 10 with a first excitation signal in the first detection mode, and feeds the antenna module 10 with a second excitation signal in the second detection mode, wherein the first excitation signal is a continuous signal or a pulse signal with a fixed frequency, wherein the second excitation signal is a signal with a varying frequency formed in a frequency sweep or a frequency hopping manner, wherein the frequency mixing module 30 is electrically connected to the antenna module 10 and the oscillation module 20, and generates a doppler signal in the first detection mode, and a frequency mixing module receives the first excitation signal in the first detection mode, and the doppler signal is electrically connected to the first frequency mixing module 10 and the first frequency mixing module 50, and the doppler signal is generated in the first detection mode, and the doppler signal is processed in the first frequency mixing module 50, respectively, the frequency modulation module 50 is configured to output a first frequency modulation control signal to the oscillation module 20 according to the first control signal, wherein the oscillation module 20 is configured to control the doppler microwave detection device with a determined detection boundary to switch from the first detection mode to the second detection mode according to the first frequency modulation control signal by outputting the second excitation signal in a frequency sweeping or frequency hopping manner, and the average power consumption of the doppler microwave detection device with a determined detection boundary can be reduced by switching from the first detection mode to the second detection mode corresponding to the doppler microwave detection device with a determined detection boundary if and only if the first doppler intermediate frequency signal has first target information.
It may be understood that the first target information is target information capable of representing the human body/object activity with a certain probability in the first doppler intermediate frequency signal, and a specific form of the first target information may be signal information meeting a corresponding amplitude range in the first doppler intermediate frequency signal, signal information meeting a corresponding frequency range in the first doppler intermediate frequency signal, signal information meeting a corresponding amplitude range and a corresponding frequency range in the first doppler intermediate frequency signal, and information meeting a corresponding parameter requirement in information obtained by the first doppler intermediate frequency signal, such as a frequency spectrum, an energy spectrum, a power spectrum, a cepstrum, a time-frequency analysis spectrum, and the like, of the first doppler intermediate frequency signal, wherein based on different environmental parameters, such as output power, frequency, duty ratio, and the like of the first excitation signal, and influence of parameters of the antenna module 10, a specific form of the first target information is various, and the invention is not limited thereto.
Further, in this embodiment of the present invention, the control module 40 is configured to output a pair of external control signals according to the second target information corresponding to the human activity of the second doppler intermediate frequency signal in the second detection mode, so as to intelligently control the corresponding electrical device based on the detection of the human presence, and to facilitate ensuring the correlation between the external control signals and the human/object activity to improve the degree of intellectualization of the doppler microwave detection device with the determined detection boundary.
That is, when the doppler microwave detection device with the determined detection boundary works in the first detection mode, since the first excitation signal is an excitation signal with a fixed frequency, when a router, bluetooth, wireless earphone, mobile phone and the like are present in the environment, the first doppler intermediate frequency signal has a certain probability that first target information exists due to the presence of the co-frequency microwave interference source, and at this time, the first target information cannot characterize human body/object activities. However, the doppler microwave detection device with the determined detection boundary still enters the second detection mode due to the existence of the first target information, wherein, since the second excitation signal is a signal with a variable frequency formed in a frequency sweeping or frequency hopping manner, the frequency can avoid the frequency of a microwave interference source or is the same as the microwave interference source only in a short time, and the second doppler intermediate frequency signal does not generate the second target signal with a high probability in the presence of the microwave interference source only. In view of this, when the control module 40 is set in the second detection mode and outputs the external control signal according to the second target information corresponding to the human activity of the second doppler intermediate frequency signal, the correlation between the external control signal and the human/object activity is difficult to be interfered by the microwave interference source in the environment, so that when the intelligent control of the corresponding electrical device is implemented according to the external control signal, the false triggering of the corresponding electrical device can be reduced to ensure the intelligent degree of the doppler microwave detection device with the determined detection boundary.
It can be understood that the external control signal may be the second doppler intermediate frequency signal itself, the second target information in the second doppler intermediate frequency signal, or a preset signal which is called according to the existence of the second target information corresponding to the human body activity in the second doppler intermediate frequency signal, which is not limited in the present invention.
In particular, in this embodiment of the invention, the control module 40 is further configured to start timing a period of time according to the generation of the first control signal, wherein the frequency modulation module 50 is configured to stop outputting the first frequency modulation control signal to the oscillation module 20 according to the end of the period of time to control the oscillation module 20 to output the first excitation signal and control the doppler microwave detection device with the determined detection boundary to switch from the second detection mode back to the first detection mode, so as to reduce the operation time of the doppler microwave detection device with the determined detection boundary in the second detection mode, thereby advantageously reducing the average power consumption of the doppler microwave detection device with the determined detection boundary.
It should be noted that, in this embodiment of the present invention, the control module 40 is preferably configured to output a second control signal to the frequency modulation module 50 according to the absence of the second target signal of the second doppler intermediate frequency signal during the period, wherein the frequency modulation module 50 is configured to output a second frequency modulation control signal to the oscillation module 20 according to the second control signal, wherein the oscillation module 20 is configured to output the first excitation signal according to the second frequency modulation control signal at another fixed frequency, so that the interference of the microwave interference source in the environment is avoided in the first detection mode, and accordingly, the average power consumption of the doppler microwave detection method and apparatus with the determined detection boundary can be further reduced by reducing false triggering of the second detection mode.
That is, when the doppler microwave detection device with the determined detection boundary works in the first detection mode, since the first excitation signal is an excitation signal with a fixed frequency, when a router, bluetooth, wireless earphone, mobile phone and the like are present in the environment, the first doppler intermediate frequency signal has a certain probability that first target information exists due to the presence of the co-frequency microwave interference source, and at this time, the first target information cannot characterize human body/object activities. However, the doppler microwave detection device with the determined detection boundary still enters the second detection mode due to the existence of the first target information, wherein, since the second excitation signal is a signal with a variable frequency formed in a frequency sweeping or frequency hopping manner, the frequency can avoid the frequency of a microwave interference source or is the same as the microwave interference source only in a short time, and the second doppler intermediate frequency signal does not generate the second target signal with a high probability in the presence of the microwave interference source only. In view of this, when the control module 40 is set to output the second control signal to the frequency modulation module 50 according to the absence of the second target signal in the second doppler intermediate frequency signal during the period, the frequency modulation module 50 is set to output a second frequency modulation control signal to the oscillation module 20 according to the second control signal, and the oscillation module 20 is set to output the first excitation signal according to the second frequency modulation control signal at another fixed frequency, the doppler microwave detection device with the determined detection boundary returns to the frequency of the first excitation signal in the first detection mode again, and can be staggered with the frequency of the microwave interference source to avoid the interference with the microwave interference source in the environment, so that false triggering to the second detection mode can be reduced to be beneficial to further reduce the average power consumption of the doppler microwave detection method and device with the determined detection boundary.
Further, in this embodiment of the present invention, the mixing module 30 is configured to include a mixing unit 31 and a signal amplifying unit 32, wherein the mixing unit 31 is electrically connected to the antenna module 10 and the oscillating module 20, respectively, to mix the signal received by the antenna module 10 and the first excitation signal in the first detection mode to generate the first doppler intermediate frequency signal, and to mix the signal received by the antenna module 10 and the second excitation signal in the second detection mode to generate the second doppler intermediate frequency signal, wherein the signal amplifying unit 32 is electrically connected to the mixing unit 31 to amplify the first doppler intermediate frequency signal in the first detection mode and to amplify the second doppler intermediate frequency amplified signal in the second detection mode.
Further, the control module 40 includes a first target information extraction unit 41 and a second target information extraction unit 42 electrically connected to the mixing module 30 at the same time, wherein the first target information extraction unit 41 is configured to perform an extraction operation on the first target information in the first doppler intermediate frequency signal in the first detection mode, and output the first control signal to the frequency modulation module 50 and the second target information extraction unit 42 according to the first target information, respectively, and the second target information extraction unit 42 is configured to perform an extraction operation on the second target information in the second doppler intermediate frequency signal according to the first control signal, so that the second target information extraction unit 42 is kept in a low power consumption state in the first detection mode to facilitate further reducing the average power consumption of the doppler microwave detection method and apparatus with a determined detection boundary to be suitable for battery power.
It is understood that, based on the specific form of the first target information and the second target information, the first target information extraction unit 41 and the second target information extraction unit 42 may be implemented to include, but are not limited to, circuits for extracting corresponding target information including a filter circuit, a time-frequency conversion circuit, and the like, which is not limited by the present invention.
It should be noted that, in the description of the present invention, the electrical connection relationship between the modules and/or units refers to an electrical connection form of a transmission channel capable of forming an electrical signal, including but not limited to forming the transmission channel in a physically connected electrical connection form, and forming the transmission channel in a physically disconnected electrical connection form based on electromagnetic coupling characteristics of components such as capacitors, transformers, and coupling lines.
In particular, the second excitation signal is a signal with a variable frequency formed in a frequency sweep or frequency hopping manner, including but not limited to a signal with a variable frequency formed in a Frequency Shift Keying (FSK) manner and a Frequency Modulated Continuous Wave (FMCW) manner, and the accuracy of the detection of the human body activity by the doppler microwave detection device with the determined detection boundary in the second detection mode can be ensured by further feeding back distance information between the detected object and the antenna module 10 corresponding to the second doppler intermediate frequency signal relative to the first doppler intermediate frequency signal.
In a specific example, in the second detection mode, the antenna module 10 emits a microwave beam in a piecewise chirped form by piecewise chirping the second excitation signal, and receives at least one reflected echo formed by reflecting the microwave beam by at least one object to generate an echo signal corresponding to the reflected echo, the mixing module 30 generates the second doppler intermediate frequency signal corresponding to the frequency and phase difference between the second excitation signal and the echo signal in a time domain signal form by means of mixing detection, that is, the frequency of the second doppler intermediate frequency signal is a discrete state of the frequency difference between the second excitation signal and each echo signal, the initial phase of the second doppler intermediate frequency signal is a discrete state of the phase difference between the second excitation signal and the corresponding echo signal at a time point corresponding to the starting point of the second doppler intermediate frequency signal of each frequency component, wherein a space covered by the microwave beam emitted by the antenna module 10 is an actual detection space of the antenna module 10, and the second doppler intermediate frequency signal corresponding to the different frequency components of the time domain signal form is detected in the frequency domain, and the actual detection space is defined by the antenna module, and the effective space is defined by the effective distance between the second doppler intermediate frequency component and the antenna module is defined as an effective space defining the effective boundary between the frequency and the actual boundary.
Further, when there is any motion of an object in the actual detection space, the frequency and the initial phase of the second doppler intermediate frequency signal have fluctuations in the time domain, so that the object activity in the effective detection space can be judged by a lower frequency difference limit value and/or a lower frequency difference limit value based on the further limit value setting of the frequency and/or the initial phase of the second doppler intermediate frequency signal, and when the second doppler intermediate frequency signal corresponding to the frequency component which is less than or equal to the upper frequency limit value has fluctuations of a frequency value which is greater than or equal to the lower frequency difference limit value or the initial phase fluctuation which is greater than or equal to the lower frequency difference limit value is the second target information, the object activity in the effective detection space is judged according to the existence of the second target information in the second doppler intermediate frequency signal.
Referring specifically to fig. 3 of the drawings of the present specification, in a state in which the second excitation signal is piecewise chirped, specifically illustrated as a chirped state in the form of a triangular wave, the relationship between the second excitation signal, the corresponding echo signal, and the second doppler intermediate frequency signal is illustrated, wherein in the plot of the frequency of the second excitation signal over time, T C is a sweep period of a segment of the second excitation signal in the piecewise chirped form, f C is a sweep bandwidth of the segment of the second excitation signal, i.e., within T C, a frequency f S of the segment of the second excitation signal is a function of f S(t)＝f0+fC·t/TC over time T, where f 0 is the starting frequency of the second excitation signal in T C, and the expression of the second excitation signal in the time domain in the segment in the time-dependent plot of the amplitude of the second excitation signal corresponds to U S(t)＝sin(2π·fS(t)·t+Φ1. For a single stationary object, in a state in which the second excitation signal is piecewise chirped based on the transmission time τ of the microwave beam and the corresponding reflected echo, the time-varying function of the frequency f E of the corresponding echo signal is f E(t)＝fS (t- τ), the expression corresponding to this echo signal in the time domain may be expressed as U E(t)＝sin(2π·fE(t)·t+Φ2), i.e. the second excitation signal and the corresponding echo signal have a frequency difference f S(t)-fE(t)＝fC·τ/Tc and a phase difference Φ 1-Φ2＝2πf0 ·τ, the expression corresponding to the second doppler intermediate frequency signal in the time domain may be expressed as U B(t)＝sin(2π·fC·τ·t/Tc+2πf0 ·τ), i.e. the frequency f B＝fC·τ/Tc of the second doppler intermediate frequency signal, the initial phase is 2pi f 0 - τ, where τ is related to the distance d between the object and the antenna module 10, i.e. τ=2d/c, where c is the speed of light, then U B(t)＝sin(2π·fB·t+4πdf0/c), where f B＝2fC·d/c·TC, i.e. the frequency of the second doppler intermediate frequency signal is directly proportional to the distance between the object and the antenna module.
It will be appreciated that, as the actual detection space tends to have a plurality of objects, i.e. the frequency of the second doppler intermediate frequency signal is a discrete state of the difference between the frequencies of the second excitation signal and the echo signals and has at least one frequency component, corresponding to at least one peak in the frequency domain of the second doppler intermediate frequency signal when the second doppler intermediate frequency signal in the time domain signal form is converted into the frequency domain signal form by fourier transform, each peak corresponding to the frequency component of the second doppler intermediate frequency signal and having a certain frequency bandwidth based on the time width of T C, in practical application, the different frequency components of the time domain signal in the frequency domain correspond to the different distances between the corresponding objects in the actual detection space and the antenna module 10, so as to be able to define an effective detection boundary based on the corresponding limit value of the second doppler intermediate frequency signal in the frequency domain, so that the effective detection space is defined with an effective detection boundary defined by the effective detection boundary, based on the frequency limit value.
Further, corresponding to fig. 5, when there is a motion of an object in the actual detection space, the frequency and the initial phase of the second doppler intermediate frequency signal of the corresponding frequency component have time domain fluctuations based on doppler effect principle, specifically based on the expression U B(t)＝sin(2π·fB·t+4πdf0/c of the second doppler intermediate frequency signal in the time domain, wherein f B＝2fC·d/c·TC is understood that, since the change Δd of the distance between the corresponding object and the antenna module 10 causes the change of the frequency value of the second doppler intermediate frequency signal of the corresponding frequency component within the frequency bandwidth of the frequency component, and simultaneously causes the change of the initial phase of the second doppler intermediate frequency signal of the frequency component, when there is a motion of an object in the actual detection space, the frequency value and the initial phase of the second doppler intermediate frequency signal of the corresponding frequency component have time domain fluctuations, so that it can be determined that there is an object motion in the effective detection space with a lower frequency difference limit and/or a lower limit difference between the second doppler intermediate frequency signal of the corresponding to be equal to or less than the upper limit value, and the second doppler motion information of the second doppler intermediate frequency component is equal to or greater than the lower limit value of the initial phase of the second doppler intermediate frequency signal is determined to be equal to the second motion information.
Corresponding to the above description, the Doppler microwave detection method with the determined detection boundary of the present invention comprises the following steps:
S1, the oscillation module 20 feeds the antenna module 10 with the first excitation signal with a fixed frequency, and the mixing module 30 mixes the signal received by the antenna module 10 with the first excitation signal to generate the first Doppler intermediate frequency signal;
s2, the control module 40 outputs the first control signal to the frequency modulation module 50 according to the presence of first target information of the first Doppler intermediate frequency signal, and the frequency modulation module outputs the first frequency modulation control signal to the oscillation module 20 according to the first control signal;
S3, the oscillation module 20 outputs the second excitation signal to feed the antenna module 10 in a frequency sweeping or frequency hopping manner according to the first frequency modulation control signal, the antenna module 10 emits a microwave beam in a frequency sweeping or frequency hopping manner, wherein a coverage space of the microwave beam is taken as an actual detection space, the mixing module 30 mixes the signal received by the antenna module 10 and the second excitation signal to generate the second Doppler intermediate frequency signal, the control module 40 outputs a pair of external control signals according to the existence of second target information of the second Doppler intermediate frequency signal, wherein the second target information is a frequency value fluctuation which is greater than or equal to the lower limit frequency difference limit value or an initial phase fluctuation which is greater than or equal to the lower limit frequency difference limit value in the second Doppler intermediate frequency signal of a frequency component which is less than or equal to the upper limit frequency limit value, so that the effective detection space has a determined boundary based on the fact that the effective detection space is set at the outer boundary of the actual detection space is defined, and the second target information is used for controlling the intelligent human body to move correspondingly.
Specifically, in the step S3, the control module 40 further starts timing a period of time according to the generation of the first control signal, wherein the frequency modulation module 50 stops outputting the first frequency modulation control signal to the oscillation module 20 according to the end of the timing of the period of time to control the oscillation module 20 to output the first excitation signal and returns to the step S1.
Preferably, in the step S3, the control module 40 outputs the second control signal to the frequency modulation module 50 according to the absence of the second target signal in the second doppler intermediate frequency signal, wherein the frequency modulation module 50 outputs a second frequency modulation control signal to the oscillation module 20 according to the second control signal, wherein the oscillation module 20 outputs the first excitation signal at another fixed frequency according to the second frequency modulation control signal to return to the step S1, so as to avoid interference of microwave interference sources in the environment in the first detection mode of the doppler microwave detection device with a determined detection boundary.
For further understanding of the present invention, the step S3 of the doppler microwave detection method with a determination of a detection boundary according to an embodiment of the present invention is specifically exemplified, wherein the step S3 of the doppler microwave detection method with a determination of a detection boundary includes the steps of:
A. The oscillation module 20 performs piecewise chirping to output the second excitation signal according to the first frequency modulation control signal to feed the antenna module 10, and the antenna module 10 correspondingly transmits a microwave beam in a chirped form, wherein a coverage space of the microwave beam is taken as an actual detection space;
B. the antenna module 10 receives at least one reflected echo formed by the reflection of the microwave beam by at least one object in the actual detection space and generates an echo signal corresponding to the reflected echo;
C. The mixing module 30 generates the second doppler intermediate frequency signal corresponding to the frequency and phase difference between the second excitation signal and the echo signal in a time domain signal form by means of mixing detection, wherein the frequency of the second doppler intermediate frequency signal is a discrete state of the frequency difference between the second excitation signal and each echo signal and has at least one frequency component, and the initial phase of the second doppler intermediate frequency signal is a discrete state of the phase difference between the second excitation signal and the corresponding echo signal at a time point corresponding to the start point of the second doppler intermediate frequency signal of each frequency component;
D. Defining an outer boundary of the effective detection space in the actual detection space by using the upper limit frequency limit value based on the limit value setting of the second Doppler intermediate frequency signal in frequency; and
E. And based on the limit value setting of the second Doppler intermediate frequency signal in frequency and/or initial phase, judging the activity of the person/object in the effective detection space by using the lower frequency difference limit value and/or the lower phase difference limit value, wherein the second target information is corresponding to the frequency value fluctuation greater than or equal to the lower frequency difference limit value or the initial phase fluctuation greater than or equal to the lower phase difference limit value in the second Doppler intermediate frequency signal of the frequency component smaller than or equal to the upper frequency limit value, and the control module 40 outputs the external control signal according to the existence of the second target information in the second Doppler intermediate frequency signal, so as to intelligently control corresponding electrical equipment by using the external control signal based on the feedback of the second target information on the activity of the person/object in the effective detection space.
It is worth mentioning that in the step (a), the piecewise chirping of the second excitation signal includes, but is not limited to, triangular wave chirping, sawtooth wave chirping, step wave chirping, and code chirping.
Illustratively, referring to fig. 6 of the drawings of the specification of the present invention, a graph of the frequency of the second excitation signal over time based on different piecewise chirps is illustrated, where T C is the sweep period of a segment of the second excitation signal in piecewise chirped form, f C is the sweep bandwidth of the segment of the second excitation signal, i.e., within T C, and the frequency f S of the segment of the second excitation signal over time T is a function f S(t)＝f0+fC·t/TC, where f 0 is the starting frequency of the segment of the second excitation signal within T C. It should be noted that, in some embodiments of the present invention, the scanning bandwidth T C, the scanning bandwidth f C, and the starting frequency f 0 of the second excitation signal are not limited to be the same for each segment formed by piecewise chirping the second excitation signal, that is, the proportional coefficient 2f C/c·TC between the frequency f B of the second doppler intermediate frequency signal and the distance d between the corresponding object and the antenna module in different time periods is not limited to be the same based on the relation f B＝2fC·d/c·TC, but can also be based on the variation of 2f C/c·TC in different time periods, acquiring a proportional relation of frequency components corresponding to a distance D between the same object and the antenna module in the second Doppler intermediate frequency signals of different time periods to form superposition analysis of the second Doppler intermediate frequency signals, so that the outer boundary of the effective detection space can be defined in the actual detection space by the corresponding upper limit frequency limit value in the step (D), and the object activity in the effective detection space can be judged by the corresponding lower limit frequency difference limit value and/or the corresponding lower limit phase difference limit value in the step (E), and the corresponding relation between different 2f C/c·TC and the corresponding detection speed and/or accuracy is facilitated, the detection accuracy and applicability of the Doppler microwave detection method and device with the detection boundary determination are improved, and the invention is not limited to this.
Preferably, the piecewise chirp of the second excitation signal has periodicity, such as a minimum period corresponding to two scanning periods T C of two adjacent segments of the second excitation signal corresponding to triangular wave frequency modulation illustrated in fig. 3, or a minimum period corresponding to a scanning period T C of one segment of the second excitation signal corresponding to saw-tooth wave frequency modulation illustrated in fig. 6, or a minimum period corresponding to a plurality of segments of the second excitation signal having different scanning periods T C corresponding to step-like wave frequency modulation illustrated in fig. 6, so as to form a periodic piecewise chirp of the second excitation signal, thereby allowing the detection accuracy of the doppler microwave detection method and apparatus with a determined detection boundary to be improved based on a periodical data superposition analysis of the second doppler intermediate frequency signal in the step (D) and the step (E).
In particular, as shown in fig. 7 corresponding to the drawings of the specification of the present invention, a logic block diagram of the step S3 of the doppler microwave detection method with determination of detection boundary according to an embodiment of the present invention is illustrated, wherein in this embodiment of the present invention, according to the step (D), a range-doppler intermediate frequency signal is generated by selecting the second doppler intermediate frequency signal with a frequency component less than or equal to the upper limit frequency limit value in a frequency-selective filtering manner, and the range-doppler intermediate frequency signal only characterizes the effective detection space, so as to define the effective detection space based on setting of the upper limit frequency limit value formed by setting of corresponding filtering parameters.
Further, in the step (E), the method includes the steps of:
E10, converting the range-Doppler intermediate frequency signal into a frequency fluctuation signal according to the change of the frequency of the range-Doppler intermediate frequency signal along with time, wherein the amplitude fluctuation of the frequency fluctuation signal corresponds to the frequency value fluctuation of the range-Doppler intermediate frequency signal; and
And E11, taking amplitude fluctuation of the frequency fluctuation signal which is larger than or equal to the lower limit frequency difference limit value as the second target information, and judging that the object activity exists in the effective detection space based on the second target information of the second Doppler intermediate frequency signal so as to output an external control signal.
It will be appreciated that converting the range-doppler intermediate frequency signal into the frequency-fluctuating signal according to the time-dependent frequency variation of the range-doppler intermediate frequency signal, the amplitude-fluctuating frequency of the frequency-fluctuating signal corresponds to the discrete state of the frequency-value fluctuation of the range-doppler intermediate frequency signal of different frequency components, and characterizes the time-dependent variation of the distance between different objects in the effective detection space and the antenna module 10, wherein the amplitude-fluctuating frequency of the frequency-fluctuating signal corresponds to the motion frequency of the corresponding object based on the periodic time-dependent distance variation of the distance between the object generated by the periodic object motion and the antenna module 10, so as to allow the amplitude-fluctuating frequency of the frequency-fluctuating signal to be selected in a frequency range of 10Hz or less based on the frequency-selective filtering processing, and the second target information corresponds to the motion of which the motion frequency is within a frequency range of 10Hz when the amplitude-fluctuating frequency-limiting value fluctuation of the frequency-fluctuating signal is the lower limit value or more is the second target information, and thus the effective detection of the human body can be performed with a high probability, and thus the effective detection of the human body and the human body can be controlled in a stable and controlled based on the human body.
Correspondingly, in the step (E11), the method comprises the steps of:
E111, frequency-selecting filtering processing the frequency fluctuation signal to obtain the frequency fluctuation signal with the amplitude fluctuation frequency smaller than or equal to a frequency range of 10 Hz; and
And E112, taking amplitude fluctuation of the frequency fluctuation signal which is processed by frequency selection filtering and is larger than or equal to the lower limit frequency difference limit value as the second target information, and judging that the human body activity exists in the effective detection space based on the second target information of the second Doppler intermediate frequency signal so as to output an external control signal.
Further, referring to fig. 8 of the drawings, a logic block diagram of the doppler microwave detection method and apparatus with determination of detection boundary according to another embodiment of the present invention is illustrated, and similarly, in this embodiment of the present invention, a range-doppler intermediate frequency signal is generated by selecting the second doppler intermediate frequency signal with a frequency component less than or equal to the upper limit frequency limit value in a frequency-selective filtering manner according to the step (D), and the range-doppler intermediate frequency signal only characterizes the effective detection space to define the effective detection space based on setting of the upper limit frequency limit value by setting of corresponding filtering parameters.
In particular, in said step (E), the steps are included:
e20, performing fourier transform on the range-doppler intermediate frequency signal to obtain distribution information of frequency values of the range-doppler intermediate frequency signal of each frequency component in a time dimension, where the distribution information of the frequency values of the range-doppler intermediate frequency signal of each frequency component in the time dimension corresponds to fluctuation information of a distance between a corresponding object defined based on a range resolution and the antenna module 10 in the effective detection space in the time dimension; and
And E21, using frequency value fluctuation of the frequency value of the range Doppler intermediate frequency signal of at least one frequency component in the distribution information of the time dimension, which is larger than or equal to the lower limit frequency difference limit value, as the second target information, and judging that the object activity exists in the effective detection space based on the second target information of the second Doppler intermediate frequency signal, so as to output an external control signal.
It will be appreciated that fourier transforming the range-doppler intermediate frequency signal to obtain information of the distribution of the frequency values of the range-doppler intermediate frequency signal of each frequency component in the time dimension, the information of the distribution of the frequency values of the range-doppler intermediate frequency signal of each frequency component in the time dimension corresponds to information of fluctuation of the distance between the corresponding object defined based on the range resolution and the antenna module 10 in the effective detection space in the time dimension, that is, the frequency of fluctuation of the frequency value of the range-doppler intermediate frequency signal of each frequency component in the time dimension corresponds to the frequency of motion of the corresponding object defined based on the range resolution in the effective detection space, in this way, when the frequency value of the range-doppler intermediate frequency signal of at least one frequency component has frequency value fluctuation which is greater than or equal to the lower frequency difference limit value in the distribution information of the frequency value of the range-doppler intermediate frequency signal in the time dimension, and the frequency value of the range-doppler intermediate frequency signal of the frequency component has a frequency range of less than or equal to 10Hz and corresponds to an action with an action frequency in the frequency range of 10Hz, the frequency value of the range-doppler intermediate frequency signal of the frequency component characterizes the respiration and heartbeat action of the human body in the effective detection space in a high probability of the frequency value fluctuation of the frequency component in the time dimension, and the distance between the human body and the antenna module 10 can be determined corresponding to the frequency component, thereby being suitable for accurately and stably detecting the existence of the human body, and intelligently controlling the corresponding electrical device based on the detection of the existence of the human body.
Therefore, in this embodiment of the present invention, wherein in the step (E21), the second target information is a fluctuation of the frequency value of the range-doppler intermediate frequency signal of at least one frequency component whose frequency range of fluctuation of the frequency value of the range-doppler intermediate frequency signal in the time dimension is equal to or less than 10Hz, in the distribution information of the frequency value of the range-doppler intermediate frequency signal in the time dimension, and an external control signal is externally output based on the presence of the second target information in the effective detection space.
Further, referring to fig. 9 of the drawings, a logic block diagram of the doppler microwave detection method and apparatus with determination of detection boundary according to another embodiment of the present invention is illustrated, and similarly, in this embodiment of the present invention, a range-doppler intermediate frequency signal is generated by selecting the second doppler intermediate frequency signal with a frequency component less than or equal to the upper limit frequency limit value in a frequency-selective filtering manner according to the step (D), and the range-doppler intermediate frequency signal only characterizes the effective detection space to define the effective detection space based on setting of the upper limit frequency limit value by setting of corresponding filtering parameters.
In particular, in said step (E), comprising the steps of:
E30, performing fourier transform on the range-doppler intermediate frequency signal to obtain distribution information of an initial phase of the range-doppler intermediate frequency signal of each frequency component in a time dimension, where the distribution information of the initial phase of the range-doppler intermediate frequency signal of each frequency component in the time dimension corresponds to fluctuation information of a distance between an object corresponding to each frequency component and the antenna module 10 in the effective detection space based on a range resolution; and
And E31, taking the fluctuation of the initial phase of the range-Doppler intermediate frequency signal with at least one frequency component in the distribution information of the time dimension, which is larger than or equal to the lower limit phase difference limit value, as the second target information, and judging that the object activity exists in the effective detection space based on the second target information of the second Doppler intermediate frequency signal, so as to output an external control signal.
It is worth mentioning that, based on the periodic characteristics of the phases, when the distribution information of the corresponding frequency component of the second doppler intermediate frequency signal in the time dimension has a frequency value fluctuation equal to or greater than the lower frequency difference limit value, the fluctuation of the initial phase of the second doppler intermediate frequency signal of the frequency component in the time dimension may exceed pi and feedback of the fluctuation of the distance between the corresponding object and the antenna module 10 in the time dimension has ambiguity. That is, when there is motion of an object in the actual detection space, the frequency and the phase of the echo signal are changed based on the doppler effect principle, but the feedback accuracy of the change of the frequency value or the initial phase of the second doppler intermediate frequency signal of the corresponding frequency component to the motion of the corresponding object is not the same based on the expression U B(t)＝sin(2π·fB·t+4πdf0/c),fB＝2fC·d/c·TC of the second doppler intermediate frequency signal in the time domain.
In particular, the frequency value variation Δf B＝2fC·Δd/c·TC of the second doppler intermediate frequency signal of the respective frequency component caused by the variation Δd of the distance between the respective object and the antenna module 10 increases with an increase in Δd, and the initial phase variation ΔΦ=4pi Δdf 0/c of the second doppler intermediate frequency signal of the respective frequency component caused varies periodically with an increase in Δd. Therefore, when the change Δd of the distance between the corresponding object and the antenna module is small, the frequency value change of the second doppler intermediate frequency signal corresponding to the corresponding frequency component is small so as to be difficult to be recognized, as when the distribution information of the frequency value of the second doppler intermediate frequency signal of the frequency component in the time dimension has a frequency value fluctuation smaller than the lower frequency difference limit value, the feedback accuracy of the distribution information of the initial phase of the second doppler intermediate frequency signal of the frequency component in the time dimension to the fluctuation of the distance between the object and the antenna module 10 in the time dimension is relatively higher; when the change Δd of the distance between the corresponding object and the antenna module 10 is large, if the distribution information of the frequency value of the second doppler intermediate frequency signal of the corresponding frequency component in the time dimension has a frequency value fluctuation greater than or equal to the lower frequency difference limit value, the fluctuation of the initial phase of the second doppler intermediate frequency signal of the frequency component in the time dimension may exceed pi, so that only the change of the distance between the object and the antenna module 10 can be represented, and the distance change between the object and the antenna module 10 cannot be specifically represented.
Thus, in some embodiments of the present invention, wherein in the step (E), the object activity in the effective detection space is determined in the combination of the lower frequency difference limit value and the lower phase difference limit value based on the limit value setting of the second doppler intermediate frequency signal in frequency and initial phase, such as at least one of a condition that the second doppler intermediate frequency signal has a frequency value fluctuation equal to or greater than the lower frequency difference limit value based on a frequency component equal to or less than the upper frequency difference limit value, and a condition that the second doppler intermediate frequency signal has an initial phase fluctuation equal to or greater than the lower phase difference limit value, it is determined that the second doppler intermediate frequency signal exists in the second target information and an external control signal is output. This is advantageous in improving the detection accuracy of the Doppler microwave detection method and device with a certain detection boundary.
In particular, referring to fig. 10 of the drawings, a logic block diagram of the step S3 of the doppler microwave detection method with determination of detection boundary according to another embodiment of the present invention is illustrated, and likewise, in this embodiment of the present invention, a range-doppler intermediate frequency signal is generated by selecting the second doppler intermediate frequency signal with a frequency component less than or equal to the upper limit frequency limit value in a frequency-selective filtering manner according to the step (D), and the range-doppler intermediate frequency signal only characterizes the effective detection space to define the effective detection space based on setting of the upper limit frequency limit value formed by setting of corresponding filtering parameters.
Further, in the step (E), the method includes the steps of:
E40, performing Fourier transform on the range-Doppler intermediate frequency signals to obtain the distribution information of the frequency values of the range-Doppler intermediate frequency signals of all frequency components in the time dimension, and obtaining the distribution information of the initial phases of the range-Doppler intermediate frequency signals of all frequency components in the time dimension; and
And E41, judging that the second target information exists in the second Doppler intermediate frequency signal based on the fact that the distribution information of the frequency value of at least one frequency component in the time dimension does not have frequency value fluctuation larger than or equal to the lower frequency difference limit value and the distribution information of the initial phase of the range Doppler intermediate frequency signal of the frequency component in the time dimension has fluctuation larger than or equal to the lower frequency difference limit value, and outputting an external control signal.
It is worth mentioning that, when the distribution information of the frequency value of the range-doppler intermediate frequency signal of at least one frequency component in the time dimension does not have the frequency value fluctuation equal to or greater than the lower frequency difference limit value, the probability of the fluctuation of the initial phase of the range-doppler intermediate frequency signal of the frequency component in the time dimension does not exceed pi, so that the distance variation between the object and the antenna module 10 can be specifically represented. I.e. the initial phase of the range-doppler intermediate frequency signal of the frequency component in the time dimension fluctuates in frequency corresponding to the movement frequency of the object defined based on the range resolution in the effective detection space, so that the distribution information of the initial phase of the range-doppler intermediate frequency signal of the frequency component in the time dimension has a phase fluctuation equal to or greater than the lower limit phase difference limit value, and the initial phase of the range-doppler intermediate frequency signal of the frequency component in the time dimension fluctuates in frequency range of 10Hz or less and corresponds to an action with an action frequency in the frequency range of 10Hz, the fluctuations of the initial phase of the range-doppler intermediate frequency signal of the frequency component in the time dimension are very probable to characterize the breathing and heartbeat action of the human body in the effective detection space, and the distance between the human body and the corresponding antenna module 10 can be determined in correspondence to the frequency component, thus being suitable for accurately and stably detecting the presence of the human body, and intelligently controlling the corresponding electrical device based on the detection of the presence of the human body.
Therefore, in this embodiment of the present invention, wherein in the step (E41), it is determined that the second target information exists for the second doppler intermediate frequency signal based on the frequency value distribution information of at least one frequency component in the time dimension that does not have the frequency value fluctuation of the lower frequency difference limit value or more, and the initial phase distribution information of the range doppler intermediate frequency signal of the frequency component in the time dimension that has the fluctuation of the lower frequency difference limit value or more, and the initial phase fluctuation frequency of the range doppler intermediate frequency signal of the frequency component in the time dimension that is 10Hz or less, the external control signal is externally output.
Referring further to fig. 11 of the drawings, a logic diagram of the doppler microwave detection method and apparatus with determination of detection boundary according to another embodiment of the present invention is illustrated, in particular, in this embodiment of the present invention, wherein in said step (E) the steps are included:
E50, performing Fourier transform on the second Doppler intermediate frequency signal to obtain distribution information of the frequency value of the second Doppler intermediate frequency signal of each frequency component in the time dimension, wherein the distribution information of the frequency value of the second Doppler intermediate frequency signal of each frequency component in the time dimension corresponds to fluctuation information of the distance between the corresponding object defined based on the distance resolution and the antenna module 10 in the actual detection space in the time dimension; and
E51, determining that the second target information exists in the second Doppler intermediate frequency signal based on the distribution information of the frequency value of the second Doppler intermediate frequency signal of at least one frequency component smaller than or equal to the upper limit frequency limit value in the time dimension and having the frequency value fluctuation larger than or equal to the lower limit frequency difference limit value, and outputting an external control signal.
Further, the second doppler intermediate frequency signal is fourier transformed to obtain distribution information of frequency values of the second doppler intermediate frequency signal of each frequency component in a time dimension, and then the distribution information of the frequency values of the second doppler intermediate frequency signal of each frequency component in the time dimension corresponds to fluctuation information of a distance between a corresponding object defined based on a distance resolution and the antenna module 10 in the actual detection space in the time dimension, wherein a fluctuation frequency of frequency value fluctuation of the frequency value of the second doppler intermediate frequency signal of each frequency component in the time dimension corresponds to a movement frequency of the corresponding object defined based on the distance resolution in the actual detection space based on periodic change of the distance between the object and the antenna module 10 generated by periodic object movement, in this way, when the frequency value of the second doppler intermediate frequency signal of at least one frequency component which is smaller than or equal to the upper limit frequency limit value has frequency value fluctuation which is larger than or equal to the lower limit frequency difference limit value in the distribution information of the time dimension, and the fluctuation frequency of the frequency value fluctuation of the frequency component in the time dimension is smaller than or equal to the frequency range of 10Hz and corresponds to the action with the action frequency in the frequency range of 10Hz, the respiration and the heartbeat action of the human body in the effective detection space are represented by the frequency value fluctuation of the frequency value of the second doppler intermediate frequency signal of the frequency component in the time dimension with high probability, and the distance between the human body and the corresponding antenna module corresponding to the frequency component can be determined, thereby being suitable for accurately and stably detecting the existence of the human body, and intelligently controlling the corresponding electrical equipment based on the detection of the existence of the human body.
Correspondingly, in this embodiment of the present invention, wherein in the step (E51), the second target information is externally output based on the distribution information of the frequency value of the second doppler intermediate frequency signal of at least one frequency component which is equal to or less than the upper limit frequency limit value in the time dimension having a frequency value fluctuation which is equal to or greater than the lower limit frequency difference limit value, and the frequency range in which the frequency value of the second doppler intermediate frequency signal of the frequency component in the time dimension has a fluctuation frequency which is equal to or less than 10Hz, determining that the second target information is present in the second doppler intermediate frequency signal.
Referring further to fig. 12 of the drawings, a logic diagram of the doppler microwave detection method and apparatus with determination of detection boundary according to another embodiment of the present invention is illustrated, in particular, in this embodiment of the present invention, wherein in said step (E) the steps are included:
E60, performing Fourier transform on the second Doppler intermediate frequency signal to obtain distribution information of the initial phase of the second Doppler intermediate frequency signal of each frequency component in the time dimension, wherein the distribution information of the initial phase of the second Doppler intermediate frequency signal of each frequency component in the time dimension corresponds to fluctuation information of the distance between a corresponding object defined based on the distance resolution and the antenna module 10 in the actual detection space in the time dimension; and
And E61, judging that the second target information exists in the second Doppler intermediate frequency signal based on the distribution information of the initial phase of the second Doppler intermediate frequency signal of at least one frequency component smaller than or equal to the upper limit frequency limit value in the time dimension and larger than or equal to the lower limit phase difference limit value, and outputting an external control signal.
Also, in some embodiments of the present invention, wherein in the step (E), the object activity in the effective detection space is judged with the lower frequency difference limit value and the lower frequency difference limit value based on the limit value setting of the second doppler intermediate frequency signal in frequency and initial phase, at least one of a condition that the second doppler intermediate frequency signal based on at least one frequency component smaller than or equal to the upper frequency difference limit value has a frequency value fluctuation larger than or equal to the lower frequency difference limit value and a condition that the second doppler intermediate frequency signal based on at least one frequency component smaller than or equal to the upper frequency difference limit value has an initial phase fluctuation larger than or equal to the lower frequency difference limit value is judged. This is advantageous in improving the detection accuracy of the Doppler microwave detection method and device with a certain detection boundary.
In particular, corresponding to fig. 13, a logical block diagram of the doppler microwave detection method and apparatus with determination of detection boundary according to another embodiment of the present invention is illustrated, in particular, in this embodiment of the present invention, wherein in said step (E), the steps are included:
E70, performing Fourier transform on the second Doppler intermediate frequency signal to obtain the distribution information of the frequency value of the second Doppler intermediate frequency signal of each frequency component in the time dimension, and obtaining the distribution information of the initial phase of the second Doppler intermediate frequency signal of each frequency component in the time dimension; and
E71, determining that the second target information exists in the second Doppler intermediate frequency signal based on the distribution information of the frequency value of the second Doppler intermediate frequency signal of at least one frequency component which is smaller than or equal to the upper limit frequency limit value in the time dimension and has no frequency value fluctuation which is larger than or equal to the lower limit frequency difference limit value, and the distribution information of the initial phase of the second Doppler intermediate frequency signal of the frequency component in the time dimension and has the phase fluctuation which is larger than or equal to the lower limit frequency difference limit value, and outputting an external control signal.
Further, in this embodiment of the present invention, wherein in the step (E71), it is determined that the second target information exists for the second doppler intermediate frequency signal to output the external control signal based on a frequency range in which a frequency value of the second doppler intermediate frequency signal of at least one frequency component which is equal to or less than the upper limit frequency limit value does not have a frequency value fluctuation in a time dimension which is equal to or greater than the lower limit frequency difference limit value, and a distribution information of an initial phase of the second doppler intermediate frequency signal of the frequency component in a time dimension has a fluctuation in the lower limit frequency difference limit value or greater, and a fluctuation frequency of the initial phase of the second doppler intermediate frequency signal of the frequency component in the time dimension is equal to or less than 10 Hz.
It should be noted that, in these embodiments of the present invention, the method further includes a step of setting the upper limit frequency limit value, specifically, in the step (D), when the frequency value of the second doppler intermediate frequency signal of at least one frequency component has a frequency value fluctuation greater than or equal to the lower limit frequency difference limit value, and/or the initial phase of the second doppler intermediate frequency signal of at least one frequency component has an initial phase fluctuation greater than or equal to the lower limit phase difference limit value, the upper limit frequency limit value is set (preset or reset) for the upper limit frequency limit value with the minimum frequency or the maximum frequency in the frequency component, so that the boundary setting of the effective detection space is simple, and the professional requirement of measuring and calculating the installation height of the corresponding antenna module can be avoided, thereby having better applicability.
In particular, corresponding to fig. 14, based on the penetration characteristics of microwaves, in practical applications, the far-end space of the actual detection space is uncontrollable and there may be unknown object activity, so in the setting step of the upper limit frequency limit value, the control module 40 preferably defines the effective detection space remotely and intuitively with the outer boundary of the effective detection space where the position boundary thereof is set as the outer boundary of the effective detection space, when the frequency value of the second doppler intermediate frequency signal of at least one frequency component has a frequency value fluctuation equal to or greater than the lower limit frequency limit value, and/or the initial phase of the second doppler intermediate frequency signal of at least one frequency component has an initial phase fluctuation equal to or greater than the lower limit phase difference limit value, based on an instruction to set the upper limit frequency limit value, with the minimum frequency of the frequency component being the upper limit frequency limit value, so as to facilitate observation of the corresponding space by a set person.
It should be noted that, in some embodiments of the present invention, based on the setting of the plurality of upper frequency limit values, the effective detection space is divided by multiple regions to obtain the position distribution of the moving object in the effective detection space, so as to be beneficial to further enrich the intelligent application of the doppler microwave detection method and device with the detection boundary determination.
In addition, in practical application of the present invention, the number of the antenna modules is allowed to be set to be plural, so as to form at least two paths of the second doppler intermediate frequency signals based on the number of the corresponding antenna modules 10, so that the distribution position information of the moving object in the effective detection space can be obtained according to the corresponding relationship between the same moving object and the corresponding frequency components of the two second doppler intermediate frequency signals, thereby being beneficial to intelligently controlling corresponding electrical equipment based on the detection of the existence position of the human body.
It should be noted that, in these embodiments of the present invention, based on the intelligent application of the doppler microwave detection method and apparatus with a determined detection boundary, the doppler microwave detection method and apparatus with a determined detection boundary further includes the steps of: and controlling the state of at least one electrical device based on the detection result of the object activity in the effective detection space.
It will be appreciated by persons skilled in the art that the above embodiments are examples only, wherein the features of the different embodiments may be combined with each other to obtain an embodiment which is easily understood from the disclosure of the invention but which is not explicitly indicated in the drawings, to which the invention is not limited.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are by way of example only and are not limiting. The objects of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been shown and described in the examples and embodiments of the invention may be modified or practiced without departing from the principles described.
Claims (26)
1. A doppler microwave detection device having a defined detection boundary, wherein the doppler microwave detection device having a defined detection boundary has a first detection mode and a second detection mode, and comprises:
an antenna module, wherein a space covered by a microwave beam emitted by the antenna module is an actual detection space of the antenna module;
An oscillating module, wherein the oscillating module feeds the antenna module with a first excitation signal in the first detection mode and feeds the antenna module with a second excitation signal in the second detection mode, wherein the first excitation signal is a continuous signal or a pulse signal with a fixed frequency, wherein the second excitation signal is a signal with a varying frequency formed in a frequency sweep or a frequency hopping manner;
The frequency mixing module is electrically connected to the antenna module and the oscillation module respectively, and is used for mixing the signal received by the antenna module and the first excitation signal in the first detection mode to generate a first Doppler intermediate frequency signal, and mixing the signal received by the antenna module and the second excitation signal in the second detection mode to generate a second Doppler intermediate frequency signal;
A frequency modulation module; and
A control module, wherein the control module is electrically connected to the mixing module and the frequency modulation module, respectively, and outputs a first control signal to the frequency modulation module according to the first target information of the first Doppler intermediate frequency signal in the first detection mode, wherein the frequency modulation module is configured to output a first frequency modulation control signal to the oscillation module according to the first control signal, wherein the oscillation module is configured to output the second excitation signal according to the first frequency modulation control signal in a frequency sweeping or frequency hopping manner, so as to control the Doppler microwave detection device with a determined detection boundary to switch from the first detection mode to the second detection mode, the control module is arranged in the second detection mode and outputs a pair of external control signals according to the existence of second target information of the second Doppler intermediate frequency signal, wherein the second target information is frequency value fluctuation which is greater than or equal to a lower limit frequency difference limit value in the second Doppler intermediate frequency signal of frequency components which are smaller than or equal to an upper limit frequency limit value or initial phase fluctuation which is greater than or equal to a lower limit phase difference limit value in the second Doppler intermediate frequency signal of frequency components which are smaller than or equal to the upper limit frequency limit value, so that the outer boundary of an effective detection space is defined in the actual detection space based on the setting of the upper limit frequency limit value, and the feedback of the human/object activity in the effective detection space is used for intelligently controlling corresponding electrical equipment by the external control signals based on the second target information.
2. The doppler microwave detection device with defined detection boundaries of claim 1 wherein the control module is further configured to begin timing a time period in accordance with the generation of the first control signal, wherein the frequency modulation module is configured to stop outputting the first frequency modulation control signal to the oscillation module in accordance with the end of the time period to control the oscillation module to output the first excitation signal to control the doppler microwave detection device with defined detection boundaries to switch from the second detection mode back to the first detection mode.
3. The doppler microwave detection device with detection boundary determination of claim 2, wherein the control module is configured to output a second control signal to the frequency modulation module in response to the absence of a second target signal from the second doppler intermediate frequency signal within the time period, wherein the frequency modulation module is configured to output a second frequency modulation control signal to the oscillation module in response to the second control signal, wherein the oscillation module is configured to output the first excitation signal at another fixed frequency in response to the second frequency modulation control signal.
4. A doppler microwave probe device with a detection boundary determination function according to any one of claims 1 to 3, wherein the control module comprises a first target information extraction unit and a second target information extraction unit electrically connected to the mixing module at the same time, wherein the first target information extraction unit is arranged in the first detection mode to extract first target information in the first doppler intermediate frequency signal, and outputs the first control signal to the frequency modulation module and the second target information extraction unit according to the first target information, respectively, wherein the second target information extraction unit is arranged to extract second target information in the second doppler intermediate frequency signal according to the first control signal, so as to keep the second target information extraction unit in a low power consumption state in the first detection mode.
5. The doppler microwave detection device with detection boundary determination of claim 4, wherein the frequency mixing module comprises a frequency mixing unit and a signal amplifying unit, wherein the frequency mixing unit is electrically connected to the antenna module and the oscillating module, respectively, to frequency-mix the signal received by the antenna module and the first excitation signal in the first detection mode to generate the first doppler intermediate frequency signal, and to frequency-mix the signal received by the antenna module and the second excitation signal in the second detection mode to generate the second doppler intermediate frequency signal, wherein the signal amplifying unit is electrically connected to the frequency mixing unit to amplify the first doppler intermediate frequency signal in the first detection mode and to amplify the second doppler intermediate frequency amplified signal in the second detection mode.
6. A doppler microwave detection device with defined detection boundaries as claimed in claim 4, wherein the second target information extraction unit is arranged to select the second doppler intermediate frequency signal with a frequency component smaller than or equal to the upper frequency limit value in a frequency selective filtering manner to generate a range doppler intermediate frequency signal, which range doppler intermediate frequency signal characterizes only the effective detection space to define the effective detection space based on the setting of the upper frequency limit value by the setting of the respective filtering parameters.
7. The doppler microwave probe device with the determined probe boundary according to claim 6, wherein the second target information extracting unit is configured to convert the range-doppler intermediate frequency signal into a frequency fluctuation signal in accordance with a change over time of the frequency of the range-doppler intermediate frequency signal, the amplitude fluctuation of the frequency fluctuation signal corresponds to the frequency value fluctuation of the range-doppler intermediate frequency signal, and to extract the second target information with the amplitude fluctuation of the frequency fluctuation signal equal to or larger than the lower frequency difference limit value as the second target information.
8. The doppler microwave probe device with the determined probe boundary according to claim 7, wherein the second target information extracting unit is further configured to acquire the frequency fluctuation signal of a frequency range in which a magnitude fluctuation frequency is 10Hz or less in a frequency selective filtering manner, and to extract the second target information with the magnitude fluctuation of the frequency fluctuation signal after the frequency selective filtering processing being the second target information with the magnitude fluctuation of the frequency fluctuation signal of the frequency fluctuation not more than the lower limit frequency difference limit value.
9. The doppler microwave detection device with the detection boundary determination according to claim 6, wherein the second target information extraction unit is configured to acquire distribution information of frequency values of the range-doppler intermediate frequency signal of each frequency component in a time dimension in accordance with fourier transform of the range-doppler intermediate frequency signal, and to extract the second target information with a fluctuation of frequency values equal to or greater than the lower frequency difference limit value in the distribution information of the frequency values of the range-doppler intermediate frequency signal of at least one frequency component in the time dimension as the second target information.
10. The doppler microwave detection device with the detection boundary determination according to claim 9, wherein the second target information extraction unit is further configured to extract the second target information based on a condition that distribution information of frequency values of the range doppler intermediate frequency signal of at least one frequency component in a time dimension has a frequency value fluctuation of the lower limit frequency difference limit value or more, and a frequency range in which a frequency of fluctuation of frequency values of the range doppler intermediate frequency signal of the frequency component in the time dimension is 10Hz or less.
11. The doppler microwave probe device with the determined probe boundary according to claim 6, wherein the second target information extracting unit is configured to acquire distribution information of an initial phase of the range-doppler intermediate frequency signal of each frequency component in a time dimension in accordance with fourier transform of the range-doppler intermediate frequency signal, and to extract the second target information with a fluctuation of the initial phase of the range-doppler intermediate frequency signal of at least one frequency component in the distribution information of the initial phase of the range-doppler intermediate frequency signal in the time dimension being equal to or larger than the lower limit phase difference limit value as the second target information.
12. The doppler microwave detection device with the detection boundary determined according to claim 6, wherein the second target information extraction unit is configured to acquire distribution information of the frequency value of the range-doppler intermediate frequency signal of each frequency component in the time dimension in accordance with fourier transform of the range-doppler intermediate frequency signal, and acquire distribution information of the initial phase of the range-doppler intermediate frequency signal of each frequency component in the time dimension, and extract the second target information based on at least one of a condition that the distribution information of the frequency value of the range-doppler intermediate frequency signal of at least one frequency component in the time dimension has a frequency value fluctuation equal to or greater than the lower frequency difference limit value, and a condition that the distribution information of the initial phase of the range-doppler intermediate frequency signal of at least one frequency component in the time dimension has a fluctuation equal to or greater than the lower frequency difference limit value.
13. The doppler microwave detection device with the detection boundary determination according to claim 12, wherein the second target information extraction unit is configured to extract the second target information on the condition that distribution information of the frequency value of the range-doppler intermediate frequency signal of at least one frequency component in the time dimension does not have a frequency value fluctuation equal to or greater than the lower frequency difference limit value, and distribution information of the initial phase of the range-doppler intermediate frequency signal of the frequency component in the time dimension has a fluctuation equal to or greater than the lower frequency difference limit value.
14. The doppler microwave detection device with the detection boundary determination according to claim 12, wherein the second target information extraction unit is configured to extract the second target information based on a condition that distribution information of a frequency value of the range doppler intermediate frequency signal of at least one frequency component in a time dimension does not have a frequency value fluctuation equal to or larger than the lower frequency difference limit value, and distribution information of an initial phase of the range doppler intermediate frequency signal of the frequency component in the time dimension has a fluctuation equal to or larger than the lower frequency difference limit value, and a fluctuation frequency of the initial phase of the range doppler intermediate frequency signal of the frequency component in the time dimension is equal to or smaller than a frequency range of 10 Hz.
15. The doppler microwave probe device with the determined probe boundary according to claim 4, wherein the second target information extracting unit is configured to acquire distribution information of the frequency value of the second doppler intermediate frequency signal of each frequency component in a time dimension in accordance with fourier transform of the second doppler intermediate frequency signal, and extract the second target information with a fluctuation of the frequency value of the second doppler intermediate frequency signal of at least one frequency component of the upper limit frequency limit value or more in the distribution information of the frequency value of the second doppler intermediate frequency signal in the time dimension being the second target information.
16. The doppler microwave detection device with the determined detection boundary according to claim 15, wherein the second target information extraction unit is further configured to extract the second target information based on a condition that distribution information of frequency values of the second doppler intermediate frequency signal of at least one frequency component of the upper limit frequency limit value or less in a time dimension has frequency value fluctuation of the lower limit frequency difference limit value or more, and a fluctuation frequency of the frequency values of the second doppler intermediate frequency signal of the frequency component in the time dimension is a frequency range of 10Hz or less.
17. The doppler microwave probe device with the determined probe boundary according to claim 4, wherein the second target information extracting unit is configured to acquire distribution information of an initial phase of the second doppler intermediate frequency signal of each frequency component in a time dimension in accordance with fourier transform of the second doppler intermediate frequency signal, and to extract second target information with a fluctuation of at least one frequency component of the upper limit frequency limit value or more in the distribution information of the initial phase of the second doppler intermediate frequency signal in the time dimension being the second target information.
18. The doppler microwave detection device with the detection boundary determined according to claim 4, wherein the second target information extraction unit is configured to extract the second target information based on at least one of a condition that the distribution information of the frequency value of the second doppler intermediate frequency signal of each frequency component in the time dimension has a frequency value fluctuation of at least one frequency component equal to or smaller than the upper limit frequency limit value and a condition that the distribution information of the initial phase of the second doppler intermediate frequency signal of at least one frequency component equal to or smaller than the upper limit frequency limit value in the time dimension has a fluctuation of at least one frequency component equal to or larger than the lower limit frequency difference limit value in the time dimension, by acquiring the distribution information of the frequency value of the second doppler intermediate frequency signal of each frequency component in the time dimension.
19. The doppler microwave detection device with the detection boundary determined according to claim 18, wherein the second target information extraction unit is configured to extract the second target information on the condition that distribution information of the frequency value of the second doppler intermediate frequency signal of at least one frequency component which is equal to or less than the upper limit frequency limit value in the time dimension does not have frequency value fluctuation equal to or more than the lower limit frequency difference limit value, and distribution information of the initial phase of the second doppler intermediate frequency signal of the frequency component in the time dimension has phase fluctuation equal to or more than the lower limit frequency difference limit value.
20. The doppler microwave detection device with the detection boundary determined according to claim 19, wherein the second target information extraction unit is configured to extract the second target information based on a condition that distribution information of a frequency value of the second doppler intermediate frequency signal of at least one frequency component that is equal to or less than the upper limit frequency limit value in a time dimension does not have a frequency value fluctuation that is equal to or greater than the lower limit frequency difference limit value, and distribution information of an initial phase of the second doppler intermediate frequency signal of the frequency component in the time dimension has a fluctuation that is equal to or greater than the lower limit frequency difference limit value, and a fluctuation frequency of the initial phase of the second doppler intermediate frequency signal of the frequency component in the time dimension is equal to or less than a frequency range of 10 Hz.
21. The doppler microwave detection device with the determined detection boundary according to claim 4, wherein the control module is configured to set the upper frequency limit value for the upper frequency limit value at one of a minimum frequency and a maximum frequency of at least one frequency component when the frequency value of the second doppler intermediate frequency signal of the frequency component has a frequency value fluctuation equal to or greater than the lower frequency difference limit value and/or the initial phase of the second doppler intermediate frequency signal of the at least one frequency component has an initial phase fluctuation equal to or greater than the lower frequency difference limit value, based on an instruction to set the upper frequency limit value.
22. A doppler microwave detection device with a defined detection boundary according to claim 21, wherein the control module is arranged to set the upper frequency limit value for the upper frequency limit value with the smallest frequency of the frequency components when the frequency value of the second doppler intermediate frequency signal of at least one frequency component has a frequency value fluctuation that is equal to or larger than the lower frequency difference limit value and/or the initial phase of the second doppler intermediate frequency signal of at least one frequency component has an initial phase fluctuation that is equal to or larger than the lower frequency difference limit value, based on the instruction to set the upper frequency limit value.
23. A doppler microwave detection method with a defined detection boundary, comprising the steps of:
S1, an oscillation module feeds a first excitation signal with fixed frequency to an antenna module, and a mixing module mixes the signal received by the antenna module and the first excitation signal to generate a first Doppler intermediate frequency signal;
S2, a control module outputs a first control signal to a frequency modulation module according to first target information of the first Doppler intermediate frequency signal, and the frequency modulation module outputs a first frequency modulation control signal to the oscillation module according to the first control signal; and
S3, the oscillation module outputs a second excitation signal to feed the antenna module in a frequency sweeping or frequency hopping mode according to the first frequency modulation control signal, the corresponding antenna module emits a microwave beam in a frequency sweeping or frequency hopping mode, a coverage space of the microwave beam is used as an actual detection space, the frequency mixing module mixes the signal received by the antenna module and the second excitation signal to generate a second Doppler intermediate frequency signal, the control module outputs a pair of external control signals outwards according to the existence of second target information of the second Doppler intermediate frequency signal, wherein the second target information is frequency value fluctuation which is greater than or equal to a lower limit frequency difference limit value or initial phase fluctuation which is greater than or equal to a lower limit frequency difference limit value in the second Doppler intermediate frequency signal of a frequency component which is less than or equal to an upper limit frequency limit value, so that the effective detection space has a determined boundary based on the outer boundary of the upper limit frequency limit value which is set in the actual detection space, and feedback of human/object movement in the effective detection space based on the second target information is used for intelligently controlling corresponding equipment.
24. The method according to claim 23, wherein in the step S3, the control module further starts timing a period of time according to the generation of the first control signal, wherein the frequency modulation module stops outputting the first frequency modulation control signal to the oscillation module to control the oscillation module to output the first excitation signal and returns to the step S1 according to the end of the timing of the period of time.
25. The method according to claim 24, wherein in the step S3, the control module outputs a second control signal to the frequency modulation module according to the second doppler intermediate frequency signal, wherein the frequency modulation module outputs a second frequency modulation control signal to the oscillation module according to the second control signal, wherein the oscillation module outputs the first excitation signal according to the second frequency modulation control signal at another fixed frequency and returns to the step S1.
26. A doppler microwave detection method with defined detection boundaries according to any one of claims 23 to 25, wherein said step S3 comprises the steps of:
A. The oscillation module outputs the second excitation signal to feed the antenna module according to the first frequency modulation control signal piecewise linear frequency modulation;
B. the antenna module receives at least one reflected echo formed by the reflection of the microwave beam by at least one object in the actual detection space and generates an echo signal corresponding to the reflected echo;
C. The frequency mixing module generates the second Doppler intermediate frequency signal corresponding to the frequency and phase difference between the second excitation signal and the echo signal in a time domain signal form through a frequency mixing detection mode, the frequency of the second Doppler intermediate frequency signal is a discrete state of the frequency difference between the second excitation signal and each echo signal and has at least one frequency component, and the initial phase of the second Doppler intermediate frequency signal is a discrete state of a phase difference between the second excitation signal and the corresponding echo signal at a time point corresponding to the starting point of the second Doppler intermediate frequency signal of each frequency component;
D. Defining an outer boundary of the effective detection space in the actual detection space by using the upper limit frequency limit value based on the limit value setting of the second Doppler intermediate frequency signal in frequency; and
E. Based on the limit value setting of the second Doppler intermediate frequency signal in frequency and/or initial phase, frequency value fluctuation larger than or equal to the lower limit frequency difference limit value or initial phase fluctuation larger than or equal to the lower limit phase difference limit value in the second Doppler intermediate frequency signal of the frequency component smaller than or equal to the upper limit frequency limit value is taken as second target information, and the control module outputs the external control signal according to the existence of second target information of the second Doppler intermediate frequency signal, so that the corresponding electrical equipment is intelligently controlled by the external control signal based on the feedback of the second target information on the human/object activity in the effective detection space.
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