CN115754916A

CN115754916A - Doppler microwave detection device and detection boundary adaptive adjustment method thereof

Info

Publication number: CN115754916A
Application number: CN202211449895.8A
Authority: CN
Inventors: 邹高迪; 邹明志; 邹新; 邹亮
Original assignee: Shenzhen Merrytek Technology Co Ltd
Current assignee: Shenzhen Merrytek Technology Co Ltd
Priority date: 2021-11-19
Filing date: 2022-11-19
Publication date: 2023-03-07
Also published as: CN115825970A; CN219039355U; CN219302675U; CN219039354U; CN219349116U; WO2023088451A1

Abstract

The invention provides a Doppler microwave detection device and a detection boundary self-adaptive adjusting method thereof, wherein the Doppler microwave detection device comprises an adjusting input unit, an adjusting control circuit, a feed circuit, a frequency mixing unit and an antenna unit, wherein the feed circuit is electrically connected to the frequency mixing unit and the antenna unit in a feed mode so as to transmit an excitation signal to the frequency mixing unit in a power supply state and feed the antenna unit with the excitation signal, the adjusting control circuit is connected to the adjusting input unit and the feed circuit so as to use the adjusting input unit as a man-machine interaction window of the Doppler microwave detection device, and the independence of the working frequency and the impedance of the feed circuit is maintained in a state of maintaining the independence of the working frequency and the impedance of the feed circuit based on the selection of corresponding input information of the adjusting input unit in a preset amplitude section V _I V _II Segment setting of excitation of the output of the feed circuitEffective amplitude V of the excitation signal _n 。

Description

Doppler microwave detection device and detection boundary adaptive adjustment method thereof

Technical Field

The invention relates to the field of Doppler microwave detection, in particular to a Doppler microwave detection device and a detection boundary adaptive adjustment method thereof.

Background

With the development of the internet of things technology, the requirements of artificial intelligence, smart home and intelligent security technology on environment detection, particularly on detection accuracy of human existence, movement and micro motion are higher and higher, and accurate judgment basis can be provided for intelligent terminal equipment only by acquiring a stable enough detection result. Wherein the microwave detection technology based on the Doppler effect principle is used as a person and an object, the important junction connected between the object and the object has unique advantages in the behavior detection and existence detection technology, the microwave detection technology can transmit a microwave beam at a fixed frequency, 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 mixing detection mode under the condition of not invading the privacy of the person, 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 Doppler intermediate frequency signal and realizing the intelligent interconnection between the person and the object by the response of corresponding electrical equipment to the motion of the human body when being applied to the detection of the motion of the human body, therefore, the method has a wide application prospect, but on one hand, the boundary of the corresponding microwave beam is a gradient boundary of which the radiation energy is attenuated to a certain degree, and on the other hand, the method is not deterministic because of the lack of effective control means of the electromagnetic radiation, namely, shaping means of the gradient boundary of the corresponding microwave beam, and is mainly reflected in the lack of adjusting means of the beam angle of the microwave beam, the actual detection space of the corresponding microwave detection module is fixed and is difficult to control, and correspondingly, the situation that the actual detection space is not matched with the corresponding target detection space is caused, so that the target detection space outside the actual detection space can not be effectively detected, and/or the situation that the environmental interference exists in the actual detection space outside the target detection space comprises action interference, electromagnetic interference and self-excitation interference caused by electromagnetic shielding environment, the problem that the existing microwave detection technology based on the doppler effect principle has poor accuracy and/or poor anti-interference performance is caused, that is, because the boundary of the microwave beam is a gradient boundary of which the radiation energy is attenuated to a certain degree, and a shaping means for the gradient boundary of the microwave beam is absent, the actual detection space of the existing microwave detection module is difficult to match with the corresponding target detection space in the actual application, and the defects that the existing microwave detection module has limited adaptability to different application scenes in the actual application and has poor detection stability are caused.

In order to solve the above-mentioned defects of the existing microwave detection module, at present, the sensitivity of the microwave detection module is reduced mainly by selecting the microwave detection module whose actual detection space is larger than the corresponding target detection space and setting the corresponding threshold value of the doppler intermediate frequency signal on the amplitude value, so as to eliminate the environmental interference and the motion interference of the actual detection space except the target detection space based on the reduction of the sensitivity. However, since the amplitude of the doppler intermediate frequency signal is related to the energy of the reflected echo and is also related to the size of the reflecting surface area in the environment, the size and the moving speed of the reflecting surface of the moving object and the distance between the microwave detection module, the environmental interference and the motion interference of the actual detection space outside the target detection space cannot be accurately excluded based on the reduction of the sensitivity of the microwave detection module, so that the detection of the target detection space is not stable and accurate, for example, different moving objects that are at the same distance as the microwave detection module may have different amplitude feedbacks in the doppler intermediate frequency signal due to having different sizes and/or moving speeds of the reflecting surface, and for example, a moving object farther away from the microwave detection module may have a higher amplitude feedback in the doppler intermediate frequency signal due to having a larger reflecting surface and/or moving speed, that is, the reduction of the sensitivity of the microwave detection module may not accurately exclude the environmental interference and the motion interference of the actual detection space outside the target detection space, so that the detection of the microwave detection module in the actual application is not stable and accurate.

In addition, the reduction of the sensitivity of the microwave detection module does not affect the actual detection space of the microwave detection module, so when the actual detection space of the microwave detection module is larger than the corresponding target detection space, the reduction of the sensitivity of the microwave detection module does not correspondingly reduce the power consumption of the microwave detection module and correspondingly causes radiation loss outside the target detection space, and is easy to form self-excited interference of the target detection space, especially a state that a high-reflection object exists in the target detection space and a state that the target detection space is a small non-open space, such as a state that the target detection space is a factory building or a warehouse with a large number of metal structures.

That is to say, in the prior art, by selecting the microwave detection module having an actual detection space larger than a corresponding target detection space and excluding doppler intermediate frequency signals generated by environmental interference and motion interference of the actual detection space except the target detection space in a manner of reducing the sensitivity of the microwave detection module, on one hand, the environmental interference and motion interference of the actual detection space except the target detection space cannot be accurately excluded, so that the detection of the target detection space is not stable and accurate; on the other hand, self-excited interference of the target detection space is easily formed to cause unstable operation of the microwave detection module, especially a state that a high-reflection object exists in the target detection space and a state that a small non-open space of a wall surface and a ground exists in the target detection space; and the radiation loss outside the target detection space caused by correspondingly reducing the power consumption of the microwave detection module is avoided.

Disclosure of Invention

An object of the present invention is to provide a doppler microwave detection device and a detection boundary adaptive adjustment method thereof, wherein in a state where the sensitivity of the doppler microwave detection device is fixedly set according to a threshold setting of a corresponding doppler intermediate frequency signal on an amplitude of a frequency spectrum, a power spectrum, or an amplitude, the amplitude of an excitation signal of the doppler microwave detection device can be adjusted and set, so as to adjust a gradient boundary of a microwave beam to adjust an actual detection space of the doppler microwave detection device bounded by the gradient boundary based on a correlation between the amplitude of the excitation signal and an energy density distribution of the microwave beam emitted by the doppler microwave detection device, and to equivalently form a sensitivity adjustment of the doppler microwave detection device correspondingly to an object of adjusting a detection range of the doppler microwave detection device.

Another objective of the present invention is to provide a doppler microwave detection device and a detection boundary adaptive adjustment method thereof, wherein an amplitude of an excitation signal of the doppler microwave detection device can be adjusted and set to adjust the actual detection space of the doppler microwave detection device bounded by the gradient boundary, so as to utilize characteristics of attenuation, reflectivity, and penetration rate of the microwave beam in the same dielectric layer to be constant, based on the adjustment of the actual detection space, in a state where the adjustment of the amplitude of the excitation signal in the actual detection space is adapted to a target detection space bounded by a wall, a glass layer, or a metal plate layer, to reduce a field strength of the microwave beam outside the target detection space, which is correspondingly beneficial to excluding environmental interference and motion interference outside the target detection space based on the adjustment of the amplitude of the excitation signal.

Another objective of the present invention is to provide a doppler microwave detection device and a detection boundary adaptive adjustment method thereof, wherein an amplitude of an excitation signal of the doppler microwave detection device can be adjusted and set to adjust the actual detection space of the doppler microwave detection device bounded by the gradient boundary, so as to utilize characteristics of attenuation, reflectivity, and constant transmittance of the microwave beam in the same dielectric layer, based on the adjustment of the actual detection space, in a state where the adjustment of the amplitude of the excitation signal in the actual detection space is adapted to a target detection space bounded by a wall, a glass layer, or a metal plate layer, to reduce a field intensity of the microwave beam outside the target detection space, which is correspondingly beneficial to reducing electromagnetic interference of the doppler microwave detection device outside the target detection space based on the adjustment of the amplitude of the excitation signal.

Another object of the present invention is to provide a doppler microwave detection device and a detection boundary adaptive adjustment method thereof, in which based on adjustment of the actual detection space, in a state where the adjustment of the amplitude of the excitation signal in the actual detection space is adapted to the target detection space, the intensity of an echo signal formed by reflection of the microwave beam by a wall, a glass or a metal plate layer defining the target detection space can be reduced, so as to facilitate a state where a highly reflective object exists in the target detection space and a state where the target detection space is a small non-open space based on the adjustment of the amplitude of the excitation signal, and reduce the probability that the doppler microwave detection device generates self-excited interference based on multipath reflection.

Another object of the present invention is to provide a doppler microwave detection device and a detection boundary adaptive adjustment method thereof, wherein based on the adjustment of the amplitude of the excitation signal, compared to a method of independently adopting sensitivity adjustment, since the actual detection space can be adjusted, radiation loss outside the target detection space is favorably reduced, and radiation power consumption of the microwave detection device is favorably reduced correspondingly.

Another objective of the present invention is to provide a doppler microwave detection device and a detection boundary adaptive adjustment method thereof, wherein based on the adjustment of the amplitude of the excitation signal, compared to a method of independently adjusting sensitivity, the doppler microwave detection device has a relatively definite detection boundary due to being able to adjust the actual detection space, which is beneficial to ensure the stability and accuracy of the doppler microwave detection device in the actual detection application.

Another objective of the present invention is to provide a doppler microwave detecting device and a detection boundary adaptive adjusting method thereof, wherein the doppler microwave detecting device includes a feeding circuit and an adjusting control circuit, wherein the adjusting control circuit is connected to the feeding circuit and preset with a plurality of stages corresponding to corresponding circuit parameters of the adjusting control circuit, so as to set an effective amplitude of the excitation signal output by the feeding circuit in a preset amplitude section based on the corresponding stage selection of the adjusting control circuit.

Another object of the present invention is to provide a doppler microwave detecting device and a detection boundary adaptive adjusting method thereof, wherein the corresponding step selection of the adjusting control circuit does not change the frequency of the excitation signal output by the feeding circuit nor affect the impedance matching between the feeding circuit and the corresponding antenna unit, i.e. the connection relationship between the adjusting control circuit and the feeding circuit can maintain the independence of the operating frequency and impedance of the feeding circuit, thereby being suitable for microwave detection based on the doppler effect principle.

Another objective of the present invention is to provide a doppler microwave detection device and a detection boundary adaptive adjustment method thereof, wherein the connection relationship between the adjustment control circuit and the feeding circuit can maintain the independence of the working frequency and impedance of the feeding circuit, and the corresponding hierarchical selection of the adjustment control circuit does not change the output efficiency of the feeding circuit outputting the excitation signal, so as to adjust the radiation power consumption of the microwave detection device with the same output efficiency based on the corresponding hierarchical selection of the adjustment control circuit, thereby reducing the overall power consumption of the microwave detection device in a state where the actual detection space is adapted to the target detection space based on the adjustment of the amplitude of the excitation signal.

Another object of the present invention is to provide a doppler microwave detecting device and a detection boundary adaptive adjusting method thereof, wherein, compared to a mode of independently adjusting sensitivity, by adjusting the amplitude of the excitation signal, the actual detection space bounded by the gradient boundary can be adjusted based on the change of the gradient boundary, and then the adaptation relationship between different levels of the adjusting control circuit and the target detection space under the corresponding scene or size can be intuitively indicated based on the adaptation of the size of the actual detection space and the corresponding target detection space, so as to facilitate a user to easily select an appropriate level of the adjusting control circuit according to the adaptation relationship between different levels of the adjusting control circuit and the target detection space under the corresponding scene or size in the target detection space under the different scenes or sizes, thereby facilitating popularization of the doppler microwave detecting device in a state where microwaves are not visible.

It is another object of the present invention to provide a doppler microwave detecting device and a detection boundary adaptive adjusting method thereof, wherein the effective amplitude V of the excitation signal feeding the antenna unit is used _n As a variable, an effective amplitude V of the excitation signal based on an energy density distribution of the microwave beam _n When the responsivity tends to change linearly, an amplitude section V of the excitation signal is corresponded _I V _II Segment for effective amplitude V of said excitation signal _n Adjusting or stepping to select the gradient boundary of the actual detection space, wherein the amplitude value V is obtained due to the energy density distribution of the microwave beam _I V _II The responsivity of the change of the amplitude V of the excitation signal of the section tends to change linearly, and the energy efficiency of the microwave detection device can be guaranteed.

Another objective of the present invention is to provide a doppler microwave detection device and a detection boundary adaptive adjustment method thereof, wherein the doppler microwave detection device is preset with a preset background noise value, wherein the detection direction of the doppler microwave detection device is not occupied in a target detection region, and the amplitude segment V of the excitation signal is occupied in an amplitude segment V of the excitation signal based on a relatively high correlation between the energy density distribution of the microwave beam and the amplitude of the excitation signal _I V _II Segment self-adaptively adjusting effective amplitude V of excitation signal from large to small _n And reading the corresponding effective amplitude V of the excitation signal _n The bottom noise value of the Doppler intermediate frequency signal is set to correspond to the amplitude V of the excitation signal when the read bottom noise value of the Doppler intermediate frequency signal is smaller than or equal to the preset bottom noise value _H For the maximum amplitude of the excitation signal adapted to the current circumstances, it is thus advantageous to set the effective amplitude V of the excitation signal in a subsequent phase on the basis of the boundary of the target detection space _n And when the adjustment is carried out, the adjustable range of the boundary of the target detection space is ensured, and the radiation loss outside the target detection space is reduced.

Another object of the present invention is to provide a doppler microwave detecting device and a detection boundary adaptive adjusting method thereof, wherein in the state that no person is in the target detection region, in the amplitude section V of the excitation signal _I V _II Segment V with _H Adjusting the effective amplitude V of the excitation signal from large to small for the maximum amplitude limit _n And reading the corresponding effective amplitude V of the excitation signal _n Taking the background noise value of the Doppler intermediate frequency signal and the read background noise value of the Doppler intermediate frequency signal as an environment background noise value, and establishing an environment background noise value of the current environment and an effective amplitude V corresponding to the excitation signal _n For the purpose of adaptive setting of the target detection space based on the position of a moving object (e.g., a waving or walking human body) as the boundary of the target detection space, the moving object being present in the target detection area, and the amplitude section V of the excitation signal _I V _II Segment V with _H Adjusting the effective amplitude V of the excitation signal from small to large for a maximum amplitude limit _n And reading the corresponding effective amplitude V of the excitation signal _n The amplitude A of the Doppler intermediate frequency signal in the frequency spectrum, the energy spectrum, the power spectrum or the amplitude is read, so that the amplitude A of the Doppler intermediate frequency signal is read and the effective amplitude V of the corresponding excitation signal _n When the corresponding environment background noise value has a difference value, the amplitude V of the corresponding excitation signal is used as the amplitude value _L To match the minimum amplitude of the target detection space, so as to be able to detect the excitation signal in an amplitude section V based on _L V _H At least one effective amplitude V of the segment _n And setting, namely realizing the self-adaptive setting of the target detection space by taking the position of the movable object as a boundary.

According to an aspect of the present invention, there is provided a doppler microwave detection device, comprising:

an adjustment input unit;

the adjusting control circuit comprises an input identification unit, a logic processing unit and a communication interface unit, wherein the input identification unit is electrically connected with the adjusting input unit and the logic processing unit so as to identify the input information of the adjusting input unit and transmit digital information corresponding to the input information to the logic processing unit;

a feeding circuit, wherein the feeding circuit is configured in an integrated circuit form and comprises a communication interface module, a digital logic processing unit, a voltage-controlled oscillation unit and an excitation signal amplitude adjusting unit, wherein the logic processing unit is pre-provided with a corresponding hierarchical control command capable of being recognized by the digital logic processing unit and is electrically connected to the communication interface unit so as to call the corresponding hierarchical control command to be transmitted to the communication interface unit according to the digital information received from the input recognition unit, wherein the communication interface module is electrically connected to the communication interface unit so as to receive the corresponding hierarchical control command from the communication interface unit, wherein the voltage-controlled oscillation unit is electrically connected to both the digital logic processing unit and the excitation signal amplitude adjusting unit so as to output an excitation signal with a corresponding frequency to the excitation signal amplitude adjusting unit under the control of the digital logic processing unit, and wherein the digital logic processing unit is electrically connected to the communication interface module and the excitation signal amplitude adjusting unit so as to receive the corresponding hierarchical control command from the communication interface module and control the excitation signal amplitude adjusting unit according to the received hierarchical control command so as to adjust the effective amplitude of the excitation signal;

a frequency mixing unit; and

an antenna unit, wherein the antenna unit is electrically connected to the frequency mixing unit and fed to the excitation signal amplitude adjustment unit, so as to transmit a microwave beam corresponding to the frequency of the excitation signal to form an actual detection space in a state of being fed by the excitation signal output by the excitation signal amplitude adjustment unit, and receive a reflected echo formed by the microwave beam being reflected by a corresponding object in the actual detection space, so as to transmit an echo signal corresponding to the reflected echo to the frequency mixing unit, wherein the frequency mixing unit is further electrically connected to the voltage-controlled oscillation unit to access the excitation signal output from the voltage-controlled oscillation unit, and is configured to output an intermediate frequency doppler signal corresponding to the frequency/phase difference between the excitation signal and the echo signal in a frequency-mixing detection manner.

In an embodiment, the excitation signal amplitude adjusting unit includes at least two branch adjusting circuits, wherein each branch adjusting circuit includes a first MOS transistor and a second MOS transistor, a source of the first MOS transistor of the same branch adjusting circuit is electrically connected to a drain of the second MOS transistor, a gate of the second MOS transistor of each branch adjusting circuit is electrically connected to the voltage-controlled oscillation unit, a source of the second MOS transistor of each branch adjusting circuit is grounded, a drain of the first MOS transistor of each branch adjusting circuit is electrically connected to the antenna unit and is connected to a positive power supply via a resistor/inductor, and a gate of the first MOS transistor of each branch adjusting circuit is electrically connected to the digital logic processing unit, so as to implement on and off control of the first MOS transistor of the corresponding branch adjusting circuit based on input information transformation of the adjusting input unit, thereby implementing effective amplitude adjustment of the excitation signal output by the excitation signal amplitude adjusting unit.

In an embodiment, the excitation signal amplitude adjusting unit includes at least two branch adjusting circuits, wherein each branch adjusting circuit includes a first MOS transistor and a second MOS transistor, wherein a source of the first MOS transistor of the same branch adjusting circuit is electrically connected to a drain of the second MOS transistor, wherein a gate of the second MOS transistor of each branch adjusting circuit is electrically connected to the voltage-controlled oscillating unit, and a source of the second MOS transistor of each branch adjusting circuit is grounded, wherein a drain of the first MOS transistor of each branch adjusting circuit is electrically connected to the antenna unit and is connected to a positive electrode of a power supply through a resistor/inductor, respectively, and a gate of the first MOS transistor of each branch adjusting circuit is electrically connected to the digital logic processing unit, respectively, wherein the second MOS transistor of each branch adjusting circuit is equivalently configured with at least two MOS transistors connected in parallel to each other, so as to achieve on-off control of the first MOS transistor of the corresponding branch adjusting circuit based on corresponding input information transformation of the adjusting input unit, thereby achieving effective excitation signal amplitude adjustment of the excitation signal output of the excitation signal amplitude adjusting unit.

In an embodiment, the excitation signal amplitude adjusting unit includes at least two branch adjusting circuits, wherein each branch adjusting circuit includes a first MOS transistor and a second MOS transistor, wherein a source of the first MOS transistor of the same branch adjusting circuit is electrically connected to a drain of the second MOS transistor, a gate of the second MOS transistor of each branch adjusting circuit is electrically connected to the voltage-controlled oscillation unit, a source of the second MOS transistor of each branch adjusting circuit is grounded, a drain of the first MOS transistor of each branch adjusting circuit is connected to a positive power supply terminal through a first inductor, each first inductor is coupled to a second inductor, the second inductor is connected in parallel to one of two third inductors, one end of the third inductor is connected to the antenna unit, and the other end of the third inductor is connected to the antenna unit, so that the drain of the first MOS transistor of each branch adjusting circuit and the drain of the antenna unit are connected to the antenna unit, and the excitation signal amplitude adjusting unit is connected to the gate of the corresponding branch adjusting circuit.

In an embodiment, the excitation signal amplitude adjusting unit includes at least two branch adjusting circuits, wherein each branch adjusting circuit includes a branch MOS transistor and a branch inductor/resistor, wherein one end of the branch inductor/resistor of the same branch adjusting circuit is electrically connected to the drain of the branch MOS transistor, wherein the other end of the branch inductor/resistor of each branch adjusting circuit is electrically connected to the voltage-controlled oscillation unit and the antenna unit, and is connected to the positive electrode of the power supply through a resistor/inductor, the source of the branch MOS transistor of each branch adjusting circuit is grounded, and the gate of the branch MOS transistor of each branch adjusting circuit is electrically connected to the digital logic processing unit, so as to implement on and off control of the branch MOS transistor of the corresponding branch adjusting circuit based on the input information transformation of the adjusting input unit, thereby implementing effective amplitude adjustment of the excitation signal output by the excitation signal amplitude adjusting unit.

In an embodiment, the excitation signal amplitude adjusting unit includes at least two branch adjusting circuits, wherein each branch adjusting circuit includes a branch resistor/inductor, a first MOS transistor and a second MOS transistor, wherein a source of the first MOS transistor of the same branch adjusting circuit is electrically connected to a drain of the second MOS transistor, a drain of the first MOS transistor of the same branch adjusting circuit is connected to a positive power supply via the branch resistor/inductor, a gate of the second MOS transistor of each branch adjusting circuit is electrically connected to the voltage-controlled oscillating unit, a source of the second MOS transistor of each branch adjusting circuit is electrically connected to the antenna unit and is grounded via a resistor/inductor, and a gate of the first MOS transistor of each branch adjusting circuit is electrically connected to the digital logic processing unit, so as to implement on-off control of the first MOS transistor of the corresponding branch adjusting circuit based on input information transformation of the adjusting input unit, thereby implementing effective amplitude adjustment of the excitation signal output by the excitation signal amplitude adjusting unit.

In an embodiment, at least one of the MOS transistors in the excitation signal amplitude adjusting unit is replaced with a triode based on the corresponding relationship between the gate, the drain, and the source of the MOS transistor and the base, the collector, and the emitter of the triode.

In an embodiment, the doppler microwave detection device further includes an intermediate frequency amplifying unit and a signal processing unit, wherein the intermediate frequency amplifying unit is electrically connected to the frequency mixing unit to receive the doppler intermediate frequency signal from the frequency mixing unit and amplify the received doppler intermediate frequency signal, wherein the signal processing unit is electrically connected to the intermediate frequency amplifying unit to extract an effective characteristic of the doppler intermediate frequency signal based on a corresponding threshold setting, and wherein the logic processing unit is electrically connected to the signal processing unit to output corresponding control information according to the effective characteristic of the doppler intermediate frequency signal extracted by the signal processing unit.

In an embodiment, the doppler microwave detection device further includes a control unit, wherein the control unit is electrically connected to the logic processing unit to access the control information output by the logic processing unit, and outputs a corresponding control signal to the corresponding electrical device or executes a corresponding control action to control the operating state of the corresponding electrical device in a state of accessing the corresponding control information.

In an embodiment, wherein the signal processing unit and the adjustment control circuit are respectively provided in an integrated circuit form and integrated into an MCU, the mixing unit and the intermediate frequency amplifying unit are respectively provided in an integrated circuit form and integrated into a microwave chip with the feeding circuit.

In an embodiment, the signal processing unit and the adjustment control circuit are respectively arranged in an integrated circuit form and integrated into an MCU, the intermediate frequency amplifying unit is arranged in an integrated circuit form and integrated into a microwave chip with the feeding circuit, and the mixing unit is externally arranged on the microwave chip.

In one embodiment, the adjustment input unit is one selected from a group of mechanical switch input devices consisting of a dial switch, a code switch, a multi-step switch and a dial switch.

In an embodiment, the adjustment input unit is configured as an adjustable potentiometer.

In one embodiment, the adjustment input unit is configured as a digital signal access device.

According to another aspect of the present invention, the present invention further provides a detection boundary adaptive adjustment method for a doppler microwave detection device, including the following steps:

s1, in an unmanned state in a target detection area, in a preset amplitude section V of an excitation signal _I V _II Segment self-adaptively adjusting effective amplitude V of excitation signal from large to small _n ；

S2, reading the corresponding effective amplitude V of the excitation signal _n A noise floor A of the Doppler intermediate frequency signal in frequency spectrum, energy spectrum, power spectrum or amplitude _k And comparing the read bottom noise value A of the Doppler intermediate frequency signal _k And a predetermined background noise value A ₀ At the read background noise value A of the Doppler intermediate frequency signal _k Less than or equal to the preset background noise value A ₀ In response to the amplitude V of said excitation signal _H Maximum amplitude of the excitation signal adapted to the current environment, and a base noise value A of the Doppler intermediate frequency signal read _k Establishing an environmental background noise value A under the current environment for the environmental background noise value _k And the amplitude section V of the excitation signal _I V _H Effective amplitude V of _n The corresponding information of (2);

s3, in the amplitude range, the state of the movable object in the target detection areaV _I V _H Adjusting the effective amplitude V of the excitation signal from small to large _n ；

S4, reading the corresponding effective amplitude V of the excitation signal _n The amplitude A of the Doppler intermediate frequency signal on the frequency spectrum, the energy spectrum, the power spectrum or the amplitude is obtained, and the read amplitude A of the Doppler intermediate frequency signal is compared with the effective amplitude V of the corresponding excitation signal _n Corresponding environment background noise value A _k The amplitude A of the Doppler intermediate frequency signal is read to be larger than the effective amplitude V of the corresponding excitation signal _n Corresponding environment background noise value A _k In response to the amplitude V of said excitation signal _L Determining an amplitude segment V for matching a minimum amplitude of said target detection space _L V _H Segment is the effective amplitude V of the excitation signal adapted to the current environment _n The adjustment range of (a); and

s5, in the amplitude section V of the excitation signal _L V _H Setting an effective amplitude V of the excitation signal _n 。

In one embodiment, the Doppler microwave detection device comprises a feeding circuit, a mixing unit and an antenna unit, wherein the feeding circuit is configured in an integrated circuit form and comprises a digital logic processing unit, a voltage-controlled oscillation unit and an excitation signal amplitude adjusting unit, wherein the voltage-controlled oscillation unit is electrically connected to the digital logic processing unit and the excitation signal amplitude adjustment unit at the same time, to output the excitation signal with corresponding frequency to the excitation signal amplitude adjustment unit under the control of the digital logic processing unit, wherein the excitation signal amplitude adjusting unit is electrically connected to the antenna unit and the digital logic processing unit under control of the digital logic processing unit, the effective amplitude of the excitation signal accessed from the voltage-controlled oscillation unit is adjusted under the control of the digital logic processing unit, and the excitation signal is fed and output to the antenna unit, wherein the antenna unit is electrically connected to the mixing unit to emit a microwave beam corresponding to a frequency of the excitation signal to form an actual detection space in a state of being fed by the excitation signal output from the excitation signal amplitude adjusting unit, and receiving a reflected echo formed by the microwave beam reflected by a corresponding object in the actual detection space and transmitting an echo signal corresponding to the reflected echo to the frequency mixing unit, wherein the mixing unit is further electrically connected to the voltage-controlled oscillating unit to switch in the excitation signal output from the voltage-controlled oscillating unit and output a doppler intermediate frequency signal corresponding to the frequency/phase difference between the excitation signal and the echo signal in a mixing detection manner.

In an embodiment, the doppler microwave detection device further includes an adjustment input unit and an adjustment control circuit, wherein the adjustment control circuit includes an input recognition unit, a logic processing unit and a communication interface unit, wherein the input recognition unit is electrically connected to the adjustment input unit and the logic processing unit to recognize input information of the adjustment input unit and transmit digital information corresponding to the input information to the logic processing unit, wherein the logic processing unit is preset with corresponding hierarchical control commands capable of being recognized by the digital logic processing unit and is electrically connected to the communication interface unit to retrieve corresponding hierarchical control commands to transmit to the communication interface unit according to the digital information received from the input recognition unit, wherein the feeding circuit further includes a communication interface module, wherein the communication interface module is electrically connected to the communication interface unit to receive the corresponding hierarchical control commands from the communication interface unit, wherein the digital logic processing unit is electrically connected to the communication interface module to receive the corresponding hierarchical control commands from the communication interface module and to control the amplitude of the excitation signal to effectively adjust the voltage-controlled oscillation amplitude of the adjustment unit according to the received hierarchical control commands.

Further objects and advantages of the invention will be fully apparent from the ensuing description and 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 claims.

Drawings

Fig. 1A is a block diagram of a doppler microwave detection device according to an embodiment of the present invention, when an antenna unit for transmitting and receiving is adopted.

Fig. 1B is a schematic structural block diagram of the doppler microwave detection device according to the above embodiment of the present invention, when the antenna units are separated in transmission and reception.

Fig. 2A is a block diagram illustrating an integrated configuration of the doppler microwave detection device according to the above embodiment of the present invention.

Fig. 2B is a block diagram of another integrated form of the doppler microwave detection device according to the above embodiment of the present invention.

Fig. 3A is a schematic diagram of a partial circuit structure of the doppler microwave detection device according to the above embodiment of the present invention for adjusting the amplitude of the excitation signal.

Fig. 3B is a schematic diagram of a partial circuit structure of the doppler microwave detection device according to the above embodiment of the present invention for adjusting the amplitude of the excitation signal.

Fig. 3C is a schematic diagram of a partial circuit structure of the doppler microwave detection device according to the above embodiment of the present invention for adjusting the amplitude of the excitation signal.

Fig. 3D is a schematic diagram of a partial circuit structure of the doppler microwave detection device according to the above embodiment of the present invention for adjusting the amplitude of the excitation signal.

Fig. 3E is a schematic diagram of a partial circuit structure of the doppler microwave detection device according to the above embodiment of the present invention to adjust the amplitude of the excitation signal.

FIG. 4 is a diagram of the energy density distribution of the microwave beam emitted by the Doppler microwave detection device versus the effective amplitude V of the excitation signal according to the above embodiment of the invention _n A response curve of (2) is shown.

Fig. 5 is a schematic diagram of the variation of the actual detection space of the doppler microwave detection device according to the above embodiment of the present invention with the effective amplitude Vn of the excitation signal.

Fig. 6 is a logic block diagram of a detection boundary adaptive adjustment method of a doppler microwave detection device according to an embodiment of the present invention.

Fig. 7 is a schematic diagram of the fitting relationship between the target detection space and the actual detection space in the corresponding size formed by different detection heights and detection areas.

Fig. 8A is a schematic view of an application scenario of the doppler microwave detection device of the present invention in a narrow space corresponding to a target detection space.

Fig. 8B is a schematic view of an application scenario of the doppler microwave detection device of the present invention in a state where an object with a high reflection coefficient exists in a corresponding target detection space.

Fig. 8C is a schematic view of an application scenario of the doppler microwave detection device of the present invention in a state where there is an interference action in a corresponding target detection space.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as 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 understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.

In the present invention, the terms "a" and "an" in the claims and the description should be understood as meaning "one or more", that is, one element may be one in number in one embodiment, and the element may be more than one in number in another embodiment. The terms "a" and "an" should not be construed as limiting the number unless such an element is explicitly recited in the disclosure as only one of the number and the number.

In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" should be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Referring to fig. 1A and 1B of the drawings of the present specification, a block diagram of a doppler microwave detection device according to an embodiment of the present invention is illustrated, wherein the doppler microwave detection device includes a doppler microwave detectorA tuning input unit 10, a tuning control circuit 20, a feeding circuit 30, a mixing unit 40 and an antenna unit 100, wherein the feeding circuit 30 is configured in an integrated circuit form and is electrically connected to the mixing unit 40 and the feeding connection to the antenna unit 100 to transmit an excitation signal to the mixing unit 40 in a powered state and to feed the antenna unit 100 with the excitation signal, wherein the antenna unit 100 transmits a microwave beam corresponding to a frequency of the excitation signal in the powered state to form an actual detection space, and receives a reflected echo formed by the reflection of the microwave beam by a corresponding object in the actual detection space to transmit a echo signal corresponding to the reflected echo to the mixing unit 40, the mixing unit 40 outputs a doppler intermediate frequency signal corresponding to a frequency/phase difference between the excitation signal and the echo signal in a mixing detection manner, wherein the tuning control circuit 20 is connected to the feeding circuit 30 and preset with a plurality of respective circuit parameters corresponding to the tuning control circuit 20 to select a predetermined rank V section based on a magnitude of the tuning control circuit 20 _I V _II Segment setting the effective amplitude V of the excitation signal output by the feed circuit 30 _n 。

Specifically, corresponding to fig. 1A, the antenna unit 100 is illustrated as a transceiver, and corresponding to a state that the antenna unit 100 is fed and connected to the feeding circuit 30 and is electrically connected to the mixing unit 40, so that the antenna unit 100 is fed by the feeding circuit 30 as a transmitting antenna to transmit the microwave beam, and simultaneously, the antenna unit is used as a receiving antenna to receive the reflected echo formed by the microwave beam reflected by the corresponding object in the actual detection space and transmit the echo signal corresponding to the reflected echo to the mixing unit 40. Corresponding to fig. 1B, the antenna unit 100 is disposed in a separated transmitting/receiving manner, and the antenna unit 100 is also electrically connected to the mixer unit 40 in a state of being fed to the feeding circuit 30. Specifically, unlike the antenna unit 100 having a single feeding point and being fed to the feeding circuit 30 at the feeding point and electrically connected to the mixing unit 40 in a transmit-receive integrated mode, in a state where the antenna unit 100 is set in a transmit-receive separated mode, the antenna unit 100 has a transmit feeding point fed to the feeding circuit 30 and a receive feeding point electrically connected to the mixing unit 40, so that the transmit feeding point is fed by the feeding circuit 30, and the receive feeding point transmits the echo signal corresponding to the reflected echo to the mixing unit 40.

It should be noted that, in the embodiments of the present invention, the antenna unit 100 may adopt a transmitting-receiving integrated antenna corresponding to fig. 1A or a transmitting-receiving separated antenna corresponding to fig. 1B, which is not limited in the present invention.

Further, the adjusting control circuit 20 includes an input identification unit 21, a logic processing unit 22 and a communication interface unit 23, wherein the feeding circuit 30 includes a communication interface module 31, a digital logic processing unit 32, a voltage-controlled oscillation unit 33 and an excitation signal amplitude adjusting unit 34, wherein the adjusting input unit 10 is electrically connected to the input identification unit 21 of the adjusting control circuit 20, wherein the input identification unit 21 is electrically connected to the logic processing unit 22 to identify the input information of the adjusting input unit 10 and transmit the digital information corresponding to the input information to the logic processing unit 22, wherein the logic processing unit 22 is preset with a corresponding hierarchical control command capable of being identified by the digital logic processing unit 32 of the feeding circuit 30 and is electrically connected to the communication interface unit 23 to adjust the corresponding hierarchical control command to be transmitted to the communication interface unit 23 according to the digital information received from the input identification unit 21, wherein the communication interface module 31 of the feeding circuit 30 is electrically connected to the communication interface unit 23 of the adjusting control circuit 20 to receive the corresponding hierarchical control command from the communication interface unit 23, wherein the voltage-controlled oscillation unit 32 is electrically connected to the digital processing unit 32 and the amplitude adjusting digital signal amplitude adjusting unit 34 is electrically connected to the digital processing unit 32 to receive the corresponding hierarchical control command from the communication interface unit 23, wherein the adjusting control signal amplitude adjusting input identification unit 32 and the digital processing unit 32 is electrically connected to adjust the amplitude adjusting input signal amplitude of the adjusting circuit 20, and the digital informationOutputting the excitation signal with corresponding frequency to the excitation signal amplitude adjusting unit 34, wherein the digital logic processing unit 32 is electrically connected to the communication interface module 31 and the excitation signal amplitude adjusting unit 34, so as to receive the corresponding hierarchical control command from the communication interface module 31 and control the excitation signal amplitude adjusting unit 34 to adjust the effective amplitude V of the excitation signal according to the received hierarchical control command _n Performing adjustment in which the excitation signal amplitude adjustment unit 34 is fed and connected to the antenna unit 100, so as to transmit the excitation signal with the adjusted amplitude to the antenna unit 100 and feed the antenna unit 100, transmit the microwave beam corresponding to the frequency of the excitation signal to form the actual detection space corresponding to the antenna unit 100 in a state of being fed by the excitation signal output by the excitation signal amplitude adjustment unit 34, and receive the reflected echo formed by the microwave beam being reflected by a corresponding object in the actual detection space, so as to transmit the echo signal corresponding to the reflected echo to the frequency mixing unit 40, wherein the frequency mixing unit 40 is further electrically connected to the voltage-controlled oscillation unit 33 to access the excitation signal output from the voltage-controlled oscillation unit 33, and is configured to output the doppler intermediate frequency signal corresponding to the frequency/phase difference between the excitation signal and the echo signal in a frequency-mixing detection manner.

It is worth mentioning that, based on the above structural configuration of the doppler microwave detection device, the hierarchical selection of the effective amplitude of the excitation signal output by the feeding circuit 30 in the form of a high frequency integrated circuit by the corresponding input information transformation of the adjustment input unit 10 does not change the frequency of the excitation signal output by the feeding circuit 30 nor affect the impedance matching between the feeding circuit 30 and the antenna unit 100, i.e., the connection relationship among the adjustment input unit 10, the adjustment control circuit 20, and the feeding circuit 30 can maintain the independence of the operating frequency and the impedance of the feeding circuit 30, and thus is suitable for microwave detection based on the doppler effect principle.

Further, the above-mentioned connection relationship among the adjustment input unit 10, the adjustment control circuit 20 and the feeding circuit 30 can maintain the independence of the operating frequency and impedance of the feeding circuit 30, and then the corresponding hierarchical selection of the adjustment control circuit 20 does not change the output efficiency of the feeding circuit 30 for outputting the excitation signal, so as to adjust the radiation power consumption of the microwave detection device with the same output efficiency based on the corresponding hierarchical selection of the adjustment control circuit 20, thereby reducing the overall power consumption of the microwave detection device in the actual detection space based on the state that the adjustment of the amplitude of the excitation signal is adapted to the target detection space.

In particular, in this embodiment of the present invention, the adjusting input unit 10 may be configured as a mechanical switch input device, a digital signal access device, or an analog switch input device, and is used as a man-machine interaction window of the doppler microwave detection device to adjust the effective amplitude of the excitation signal output by the feeding circuit 30 in the form of a high frequency device by switching the input information of the adjusting input unit 10, wherein the specific form of the adjusting input unit 10 does not limit the present invention, the mechanical switch input device includes a dial switch, a coded switch (e.g., BCD coded switch), a multi-step switch, a dial switch, etc., the digital signal access device includes a wireless RF module, such as an infrared remote control module, 433mhz,868mhz,2.4ghz wifi, bluetooth, zigbee, NFC, carrier communication, etc., and also includes a wired digital module, such as a DALI, KNX, CAN BUS, RS485, RS232 module, etc., and the analog switch input device includes a potentiometer.

Further, in this embodiment of the present invention, the doppler microwave detection device further includes an intermediate frequency amplifying unit 50 and a signal processing unit 60, wherein the intermediate frequency amplifying unit 50 is electrically connected to the frequency mixing unit 40 to receive the doppler intermediate frequency signal from the frequency mixing unit 40 and amplify the received doppler intermediate frequency signal, wherein the signal processing unit 60 is electrically connected to the intermediate frequency amplifying unit 50 to extract effective features of the doppler intermediate frequency signal based on corresponding threshold settings, such as extracting effective features of the doppler intermediate frequency signal based on corresponding threshold settings of the doppler intermediate frequency signal on frequency, frequency change rate, phase change rate, amplitude or amplitude change rate and/or corresponding threshold settings of the doppler intermediate frequency signal on amplitude of frequency spectrum, energy spectrum or power spectrum, wherein the logic processing unit 22 of the adjustment control circuit 20 is further electrically connected to the signal processing unit 60 to output corresponding control information based on corresponding logic rules according to the effective features of the doppler intermediate frequency signal extracted by the signal processing unit 60.

In particular, in this embodiment of the present invention, the doppler microwave detection device further includes a control unit 70, wherein the control unit 70 is electrically connected to the logic processing unit 22 to access the control information output by the logic processing unit 22, and outputs a corresponding control signal to the corresponding electrical device or performs a corresponding control action to control the operating state of the corresponding electrical device in the state of accessing the corresponding control information, for example, when the control unit 70 is configured to output the control signal of the corresponding electrical device, the control unit outputs a corresponding control signal to control the corresponding electrical device, and when the control unit 70 is configured as an electronic switch or a controllable voltage/current transformation device, the control unit performs a switching operation or a voltage/current transformation operation to control the operating state of the corresponding electrical device, so as to implement an intelligent response of the corresponding electrical device to the corresponding action according to the representation of the effective characteristic of the doppler intermediate frequency signal on the corresponding action of the human (object).

It should be noted that, in some embodiments of the present invention, at least one filtering unit is further disposed between the mixing unit 40 and the intermediate frequency amplifying unit 50 and/or between the intermediate frequency amplifying unit 50 and the signal processing unit 60, wherein the filtering unit is configured in an analog circuit form or a digital circuit form, and corresponding to a state that the filtering unit is configured in an analog circuit form, the corresponding filtering unit is configured as an analog filter including a combination of a capacitor, a resistor, an inductor and an integrated filtering circuit, wherein the type of the analog filter is not limited, and the analog filter may be selected from a low pass filter, a high pass filter, a band stop filter, a dielectric filter, an active filter, a passive filter or a combination of one or more analog filters known to those skilled in the art; corresponding to the state that the filtering units are set in the form of digital circuits, the corresponding filtering units are configured as a digital filter comprising an ADC conversion module, a central processor and a DAC conversion module, wherein the ADC conversion module, the central processor and the DAC conversion module are mutually connected in a communication way, and the central processor provides a hardware environment for running a digital filter algorithm; or, the ADC conversion module and the DAC conversion module are built in the central processing unit. It should be understood by those skilled in the art that the specific hardware configuration and algorithm of the digital Filter are not limited, for example, but not limited to, the digital Filter is configured as one or more of MCU, DSP, FPGA, external high-precision ADC integrated chip, digital logic chip with op-amp, or a combination of chips known to those skilled in the art, wherein the corresponding algorithm includes, but is not limited to, butterworth (Butterworth) algorithm, fourier (FFT/DFT) algorithm, kalman Filter (Kalman Filter) algorithm, finite impulse response Filter, non-recursive Filter (FIR) algorithm, hilbert yellow transform (HHT), linear system transform, wavelet transform, infinite impulse response Filter, recursive Filter (IIR) algorithm, or one or more algorithms known to those skilled in the art.

It is to be understood that the respective circuits of the doppler microwave detecting device can be integrated in various combinations in a state of being configured as an integrated circuit, and the present invention is not limited thereto. For example, in some embodiments of the present invention, corresponding to fig. 2A of the drawings accompanying the description of the present invention, the signal processing unit 60 is provided in the form of an integrated circuit and integrated with the regulation control circuit 20 into an MCU, and the mixing unit 40 and the intermediate frequency amplifying unit 50 are respectively provided in the form of an integrated circuit and integrated with the feeding circuit 30 into a microwave chip. In other embodiments of the present invention, as shown in fig. 2B of the drawings corresponding to the present specification, the signal processing unit 60 is provided in an integrated circuit form and integrated with the adjustment control circuit 20 into an MCU, the intermediate frequency amplifying unit 50 is provided in an integrated circuit form and integrated with the feeding circuit 30 into a microwave chip, and the mixing unit 40 is externally disposed on the microwave chip.

In particular, in some embodiments of the present invention, the antenna unit 100 is integrally packaged in the microwave chip in a state where the mixing unit 40 and the intermediate frequency amplifying unit 50 are provided in an integrated circuit form and integrated with the feeding circuit 30 into the microwave chip, or in a state where the intermediate frequency amplifying unit 50 is provided in an integrated circuit form and integrated with the feeding circuit 30 into the microwave chip, respectively.

Furthermore, it is understood that the plurality of stages preset in the adjustment control circuit 20 corresponding to the respective circuit parameters of the adjustment control circuit 20 may be a limited number of stages or may be stages tending to be continuous, so that the respective stage of the adjustment control circuit 20 is selected based on the respective state adjustment of the adjustment input unit 10 to be within the preset amplitude section V _I V _II Setting the effective amplitude V of the excitation signal output by the feed circuit 30 in stages or steplessly _n 。

For further understanding of the present invention, referring to fig. 3A to 3C of the drawings accompanying the description of the present invention, different circuit structures of the excitation signal amplitude adjusting unit 34 of the feeding circuit 30 are illustrated respectively. In this embodiment of the invention, corresponding to fig. 3A, the excitation signal amplitude adjusting unit 34 includes at least two branch adjusting circuits 341, wherein each of the branch adjusting circuits 341 includes a first MOS transistor 3411 and a second MOS transistor 3412, wherein the source of the first MOS transistor 3411 of the same branch adjusting circuit 341 is electrically connected to the drain of the second MOS transistor 3412, wherein the gate of the second MOS transistor 3412 of each branch adjusting circuit 341 is electrically connected to the voltage-controlled oscillating unit 33, the source of the second MOS transistor 3412 of each branch adjusting circuit 341 is grounded, wherein the drain of the first MOS transistor 3411 of each branch adjusting circuit 341 is electrically connected to the antenna unit 100 and is connected to the positive power supply via a resistor/inductor 344, the gates of the first MOS transistors 3411 of the branch adjusting circuits 341 are electrically connected to the digital logic processing unit 32, so that in the above structure of the doppler microwave detection device, based on the above circuit structure of the excitation signal amplitude adjusting unit 34, in a state of maintaining independence of the operating frequency and impedance of the feeding circuit 30, the corresponding input information of the adjusting input unit 10 is transformed to implement on and off control of the first MOS transistors 3411 of the corresponding branch adjusting circuits 341, thereby implementing hierarchical selection of the effective amplitude of the excitation signal output by the feeding circuit 30 in a high frequency integrated circuit form.

In this embodiment of the present invention, corresponding to fig. 3B, the excitation signal amplitude adjusting unit 34 includes at least two branch adjusting circuits 341, wherein each of the branch adjusting circuits 341 includes a branch inductor/resistor 3411 and a branch MOS 3412, wherein one end of the branch inductor/resistor 3411 of the same branch adjusting circuit 341 is electrically connected to the drain of the branch MOS 3412, wherein the other end of the branch inductor/resistor 3411 of each branch adjusting circuit 341 is electrically connected to the voltage-controlled oscillating unit 33 and the antenna unit 100, and is connected to the positive power supply via a resistor/inductor 344, the source of the branch MOS 2 of each branch adjusting circuit 341 is grounded, and the gate of the branch MOS 3412 of each branch adjusting circuit 341 is electrically connected to the digital logic processing unit 32, so that in the foregoing configuration of the doppler microwave detection device, based on the foregoing circuit configuration of the excitation signal amplitude adjusting unit 34, the amplitude adjusting circuit 30 is maintained independent in the operating frequency and impedance state, the amplitude of the input signal to the corresponding input/output switching circuit of the doppler microwave detection device is adjusted, and the integrated circuit 341 controls the corresponding branch excitation signal switching circuit 30 to be switched on and the corresponding input/output stage.

In this embodiment of the present invention, corresponding to fig. 3C, the excitation signal amplitude adjusting unit 34 includes at least two branch adjusting circuits 341, wherein each of the branch adjusting circuits 341 includes a branch resistor/inductor 3411, a first MOS transistor 3412 and a second MOS transistor 3413, wherein the source of the first MOS transistor 3412 of the same branch adjusting circuit 341 is electrically connected to the drain of the second MOS transistor 3413, the drain of the first MOS transistor 3412 of the same branch adjusting circuit 341 is connected to the positive power supply via the branch resistor/inductor 3411, wherein the gate of the second MOS transistor 3413 of each branch adjusting circuit 341 is electrically connected to the digital logic processing unit 33, the source of the second MOS transistor 3413 of each branch adjusting circuit 341 is electrically connected to the antenna unit 100 and is connected to the ground via a resistor/inductor 344, and the gates of the first MOS transistors 3412 of each branch adjusting circuit 341 are electrically connected to the digital logic processing unit 32, so that the amplitude adjusting circuits 34 are controlled by the respective input and output power supply frequency of the respective branch adjusting circuits according to the doppler detection device, and the feedback signal amplitude adjusting circuit impedance of the respective branch adjusting circuits 341 is controlled by the respective input and the respective input frequency of the respective branch adjusting circuits 30, thereby achieving the respective input and output of the respective feedback circuit.

Corresponding to fig. 3D, a variant of the circuit configuration of the excitation signal amplitude adjustment unit 34 illustrated in fig. 3A is illustrated, wherein the excitation signal amplitude adjustment unit 34 comprises at least two branch adjustment circuits 341, wherein each branch adjustment circuit 341 comprises a first MOS transistor 3411 and a second MOS transistor 3412, wherein the source of the first MOS transistor 3411 of the same branch adjustment circuit 341 is electrically connected to the drain of the second MOS transistor 3412, wherein the gate of the second MOS transistor 3412 of each branch adjustment circuit 341 is electrically connected to the voltage-controlled oscillation unit 33, the source of the second MOS transistor 3412 of each branch adjustment circuit 341 is grounded, wherein the drain of the first MOS transistor 3411 of each branch adjustment circuit 341 is electrically connected to the antenna unit 100 and is connected to the positive power supply via a resistor/inductor 344, the gate of the first MOS transistor 3411 of each branch adjustment circuit is electrically connected to the digital logic processing unit 32, so as to detect the impedance of the respective branch adjustment circuit 341, and to implement the respective switching of the excitation signal amplitude adjustment circuits 34 on and switching off of the respective branch adjustment circuits 341, thereby achieving the respective switching of the amplitude adjustment circuits on-off of the respective high-frequency feeding frequency switching circuits 30.

Corresponding to fig. 3E, another modified structure of the circuit structure of the excitation signal amplitude adjusting unit 34 illustrated in fig. 3A is illustrated, wherein the excitation signal amplitude adjusting unit 34 includes at least two branch adjusting circuits 341, wherein each branch adjusting circuit 341 includes a first MOS transistor 3411 and a second MOS transistor 3412, wherein the source of the first MOS transistor 3411 of the same branch adjusting circuit 341 is electrically connected to the drain of the second MOS transistor 3412, wherein the gate of the second MOS transistor 3412 of each branch adjusting circuit 341 is electrically connected to the voltage-controlled oscillating unit 33, the source of the second MOS transistor 3412 of each branch adjusting circuit 341 is grounded, wherein the drain of the first MOS transistor 3411 of each branch adjusting circuit 341 is respectively connected to the positive power supply via a first inductor 344, wherein each first inductor 344 is coupled to a second inductor 345, wherein the second inductor 345 is connected in parallel to one of two third inductors 346 coupled to each other, wherein one end of the third inductor 346 connected in parallel to the second inductor 345 in the two third inductors 346 is grounded, and the other end of the third inductor 346 is electrically connected to the antenna unit 100, so as to form a coupled electrical connection relationship between the drain of the first MOS 3411 of each branch adjusting circuit 341 and the antenna unit 100, wherein the gate of the first MOS 3411 of each branch adjusting circuit 341 is electrically connected to the digital logic processing unit 32, respectively, so as to maintain the independence of the operating frequency and the impedance of the feeding circuit 30 based on the circuit structure of the excitation signal amplitude adjusting unit 34 in the aforementioned structural configuration of the doppler microwave detection device, the corresponding input information transformation of the regulation input unit 10 is used to realize the on and off control of the first MOS transistor 3411 of the corresponding branch regulation circuit 341, thereby realizing the hierarchical selection of the effective amplitude of the excitation signal output by the feeding circuit 30 in the form of a high frequency integrated circuit.

Optionally, in this embodiment of the present invention, the two third inductors 346 coupled with each other are implemented as a transformer with a center tap.

It should be noted that, based on the corresponding relationship between the gate, the drain, and the source of the MOS transistor and the base, the collector, and the emitter of the transistor, in the circuit structure of the excitation signal amplitude adjusting unit 34 of the feeding circuit 30 illustrated in fig. 3A to 3E, any one of the MOS transistors can be equivalently replaced by a transistor, which is not limited in the present invention.

To further disclose the present invention, refer to the attached drawings of the present specification and as shown in fig. 4 and 5, in the vertical detection application scenario of the doppler microwave detection device, the effective amplitude V of the excitation signal for feeding the antenna unit 100 _n As variables, based on the corresponding relationship between the energy density distribution of the microwave beam and the background noise value of the corresponding Doppler intermediate frequency signal, the energy density distribution of the microwave beam and the effective amplitude V of the excitation signal _n The correlation curve between and the corresponding actual detection space formed are respectively illustrated.

Specifically, based on the background noise value of the Doppler intermediate frequency signal and the effective amplitude V of the excitation signal _n The correlation curve has a section which tends to change linearly and corresponds to the amplitude of the excitation signalValue section V _I V _II Segment in the amplitude segment V _I V _II Effective amplitude V of segment pair of the excitation signal _n When the adjustment or the stepping setting is carried out, the amplitude section V is adjusted or stepped due to the energy density distribution of the microwave beam _I V _II Effective amplitude V of said excitation signal of a segment _n The responsivity of the change tends to change linearly, and the energy efficiency of the microwave detection device can be guaranteed.

That is, the actual detection space formed by the microwave beams emitted by the antenna unit 100 based on their energy density distribution is a space bounded by a gradient boundary, which is a space in which the energy density distribution of the respective microwave beam is attenuated to a certain extent with non-determinism, corresponding to fig. 4, the effective amplitude V of the excitation signal _n Will change the energy density distribution of the microwave beam, but since the beam angle of the antenna unit 100 is constant, i.e. the outer boundary of the gradient boundary, corresponding to the dashed line in fig. 5, is constant, the effective amplitude V of the excitation signal is constant _n Is mainly reflected by the adjustment of the inner boundary of the gradient boundary of the actual detection space, and the effective amplitude V of the excitation signal _n In the case of too high or too low a condition, the change in the gradient boundary is not significant, and the energy efficiency of the microwave detection device is correspondingly relatively low.

It will be appreciated that since the excitation signal is a high frequency microwave signal, its effective amplitude V is _n Hardly can be characterized as if the effective amplitude V of the excitation signal is _n In some expressions of (2), as in the case of the doppler microwave detection device in the form of a product, when the amplitude V of the adjustment input unit 10 corresponds to the effective amplitude of the excitation signal _n When the corresponding gear is identified, the effective amplitude V of the excitation signal corresponding to the different gears is expressed in dB, optionally corresponding to fig. 5 _n Relative change therebetween. At the same time, due to the effective amplitude V of the excitation signal _n The variation appears in the actual circuit as an effect corresponding to the output of said feeding circuit 30Variation of current and/or effective voltage in characterizing or judging effective amplitude V of the excitation signal _n Optionally by a change in the effective current and/or effective voltage output by the supply circuit 30, the effective amplitude V of the excitation signal being characterized or determined _n A change in (c).

It is worth mentioning that the effective amplitude V of the excitation signal at the Doppler microwave detection device _n A state that can be adjusted based on the effective amplitude V of the excitation signal _n The correlation with the energy density distribution of the microwave beam emitted by the doppler microwave detection device, the actual detection space bounded by the gradient boundary can be adjusted to effectively form sensitivity adjustment on the doppler microwave detection device for the purpose of adjusting the detection range of the doppler microwave detection device, wherein by using the characteristic that the attenuation, reflectivity and penetration rate of the microwave beam in the same dielectric layer tend to be unchanged, the state of the actual detection space based on the adjustment of the amplitude of the excitation signal is matched with the target detection space bounded by a wall, a glass or a metal plate layer, that is, the state of the inner boundary of the gradient boundary is matched with the target detection space, the field strength of the microwave beam outside the target detection space can be reduced, and the correlation is favorable for the effective amplitude V of the excitation signal _n The adjustment of (2) eliminates the environmental interference and the action interference outside the target detection space, reduces the electromagnetic interference of the Doppler microwave detection device to the outside of the target detection space, and reduces the radiation loss outside the target detection space so as to reduce the radiation power consumption of the microwave detection device. Meanwhile, the intensity of an echo signal formed by the reflection of the microwave beam by a wall, a glass or metal plate layer defining the target detection space can be reduced, so that the probability of the Doppler microwave detection device generating self-excitation interference based on multipath reflection is reduced in a state that a high-reflection object exists in the target detection space and in a state that the target detection space is a small non-open space.

In addition, compared with a mode of independently adopting sensitivity adjustment, the amplitude adjustment of the excitation signal has a relatively definite detection boundary due to the fact that the actual detection space can be adjusted, and accordingly, the stability and the accuracy of the Doppler microwave detection device in actual detection application are guaranteed.

Referring further to fig. 6 of the drawings accompanying the present specification, a logic block diagram of a detection boundary adaptive adjustment method of a doppler microwave detection device according to an embodiment of the present invention is illustrated, wherein the adjustment control circuit 20 is configured with an adaptive hierarchy, and the signal processing unit 60 is preset with a preset background noise value a ₀ Wherein in a state where the adjustment control circuit 20 selects the excitation signal adjusted to the adaptive gradation based on the corresponding input information of the adjustment input unit 10, the adjustment control circuit 20 controls the amplitude of the excitation signal generated by the feeding circuit 30 to be at V _II Based on the relatively high correlation between the detection direction of the doppler microwave detection device and the amplitude of the excitation signal, in the state that no person is in the target detection area, the adjusting control circuit 20 adjusts the preset amplitude segment V of the excitation signal _I V _II Adaptively adjusting the effective amplitude V of the excitation signal generated by the feed circuit 30 from large to small _n Said signal processing unit 60 reads the corresponding effective amplitude V of said excitation signal _n The background noise value A of the Doppler intermediate frequency signal in frequency spectrum, energy spectrum, power spectrum or amplitude _k To the read background noise value A of the Doppler intermediate frequency signal _k Less than or equal to the preset background noise value A ₀ While feeding back said regulation control circuit 20 in response to the amplitude V of said excitation signal _H The maximum amplitude of the excitation signal adapted to the current environment is advantageously set in a subsequent operation based on the boundary of the target detection space _n When adjusting, the method can ensure the adjustable range of the boundary of the target detection space, reduce radiation loss outside the target detection space, and avoid self-excitation interference and misoperation interference generated based on environmental factors, such as in the target detection spaceIn a state of small space (narrow and long space) or high-reflectance space, avoiding the effective amplitude V of the excitation signal _n The corresponding actual detection space is far larger than the target detection space to generate self-excitation interference and the state of curtain flutter type action interference outside the target detection space, so that the effective amplitude V of the excitation signal is avoided _n The corresponding actual detection space is covered to the outside of the target detection space, and false operation interference is generated.

It is worth mentioning that the noise floor value A is used as the basis _k Fluctuation in actual detection, and noise floor value A of the Doppler intermediate frequency signal _k Less than or equal to the preset background noise value A ₀ Allowing a noise floor value A based on the Doppler intermediate frequency signal _k And the preset background noise value A ₀ Is determined, e.g. at the background noise value A of the Doppler intermediate frequency signal _k And the preset background noise value A ₀ When the difference value is less than a preset difference value, the bottom noise value A of the Doppler intermediate frequency signal is judged _k Less than or equal to the preset background noise value A ₀ The invention is not limited in this regard.

Further, the regulation control circuit 20 continues to the preset amplitude section V of the excitation signal _I V _II At V _H Adjusting the effective amplitude V of the excitation signal from large to small for the maximum amplitude limit _n Said signal processing unit 60 reads the corresponding effective amplitude V of said excitation signal _n A background noise value A of the Doppler intermediate frequency signal _k And the base noise value A of the Doppler intermediate frequency signal is read _k Establishing the environmental background noise value of the current environment and the effective amplitude V of the corresponding excitation signal for the environmental background noise value _n For the purpose of adaptively setting the target detection space based on the position of a moving object (e.g. a waving or walking human body) as the boundary of the target detection space in the following, the adjusting control circuit 20 adjusts the amplitude section V of the excitation signal according to the state of the moving object in the target detection area _I V _II Segment V with _H Is a maximum amplitude limit valueAdjusting the effective amplitude V of the excitation signal to be small to large _n Said signal processing unit 60 reads the corresponding effective amplitude V of said excitation signal _n The amplitude A of the Doppler intermediate frequency signal in the frequency spectrum, the energy spectrum, the power spectrum or the amplitude is read, so that the amplitude A of the Doppler intermediate frequency signal is read and the effective amplitude V of the corresponding excitation signal _n When the corresponding environment background noise value has a difference value, the amplitude V of the corresponding excitation signal is used as the amplitude value _L To match the minimum amplitude of the target detection volume, in order to be able to detect the excitation signal in an amplitude range V _L V _H Effective amplitude V of the segment _n And setting, namely realizing the self-adaptive setting of the target detection space by taking the position of the movable object as a boundary, so that the method is simple and easy to implement and is beneficial to reducing the installation cost of the Doppler microwave detection device.

Correspondingly, the detection boundary adaptive adjustment method of the Doppler microwave detection device comprises the following steps:

s1, in the unmanned state of a target detection area, in a preset amplitude section V of the excitation signal _I V _II The effective amplitude V of the excitation signal is adjusted from large to small in a self-adaptive manner _n ；

S2, reading the corresponding effective amplitude V of the excitation signal _n The bottom noise value A of the Doppler intermediate frequency signal in the frequency spectrum, the energy spectrum, the power spectrum or the amplitude _k And comparing the read bottom noise value A of the Doppler intermediate frequency signal _k And the preset background noise value A ₀ At the read background noise value A of the Doppler intermediate frequency signal _k Less than or equal to the preset background noise value A ₀ In response to the amplitude V of said excitation signal _H Maximum amplitude of the excitation signal adapted to the current environment, and a base noise value A of the Doppler intermediate frequency signal read _k Establishing an environmental background noise value A under the current environment for the environmental background noise value _k And the amplitude section V of the excitation signal _I V _H Effective amplitude V of _n The corresponding information of (2);

s3, activities exist in the target detection areaState of object in the amplitude section V _I V _H Adjusting the effective amplitude V of the excitation signal from small to large _n ；

S4, reading the corresponding effective amplitude V of the excitation signal _n The amplitude A of the Doppler intermediate frequency signal on the frequency spectrum, the energy spectrum, the power spectrum or the amplitude is obtained, and the read amplitude A of the Doppler intermediate frequency signal is compared with the effective amplitude V of the corresponding excitation signal _n Corresponding environment background noise value A _k The amplitude A of the Doppler intermediate frequency signal is read to be larger than the effective amplitude V of the corresponding excitation signal _n Corresponding environment background noise value A _k In response to the amplitude V of said excitation signal _L Determining an amplitude segment V for matching a minimum amplitude of said target detection space _L V _H Segment is effective amplitude V of said excitation signal adapted to the current environment _n The adjustment range of (2); and

Preferably, in the step S4, the amplitude section V of the excitation signal is established by taking the read doppler intermediate frequency signal amplitude a as an amplitude threshold value _L V _H Effective amplitude V of the segment _n Information corresponding to the respective amplitude threshold value, and in said step S5, to the effective amplitude V _n The amplitude threshold value of the signal is the threshold value of the Doppler intermediate frequency signal on the amplitude A, effective characteristics of the Doppler intermediate frequency signal are extracted, and corresponding control signals are output to corresponding electrical equipment according to the extracted effective characteristics of the Doppler intermediate frequency signal.

It is to be understood that the expression of the state that the target detection region is not occupied in step S1 and the expression of the state that the target detection region is occupied with the moving object in step S3 are rational expressions of the execution timing of step S1 and step S2, that is, step S1 is adapted to be executed in the state that the target detection region is occupied with the moving object, and step S3 is adapted to be executed in the state that the target detection region is occupied with the moving object, which are used only for explaining the rationality of the detection boundary adaptive adjustment method of the doppler microwave detection apparatus and do not constitute a limitation on whether the human body/moving object exists in the use environment of the doppler microwave detection apparatus, nor constitute a limitation on the determination step whether the human body/moving object exists in the target detection region. In fact, the state that the target detection area is not occupied by a person in the step S1 and the state that the target detection area has an active object in the step S3 correspond to the reception of corresponding commands by the doppler microwave detection device, for example, the doppler microwave detection device executes the step S1 based on the reception of a first command sent by the user, and executes the step S3 based on the reception of a second command sent by the user, wherein the representation of the state that the target detection area is occupied by a person in the step S1 and the representation of the state that the target detection area has an active object in the step S3 are reasonable representations of the timing for sending the first command and the second command to the user.

It is worth mentioning that the effective amplitude V of the excitation signal is adjusted as opposed to independently adjusting the sensitivity _n In this way, the actual detection space bounded by the gradient boundary can be adjusted based on the change of the gradient boundary, and then the adaptation relationship between the input information of the adjustment input unit 10 corresponding to different stages of the adjustment control circuit 20 and the target detection space under the corresponding scene or size can be intuitively indicated based on the adaptation between the size of the actual detection space and the corresponding target detection space, so as to facilitate a user to easily select an appropriate stage of the adjustment control circuit 20 according to the adaptation relationship between the input information of the adjustment input unit 10 and the target detection space under the corresponding scene or size for the target detection space under the different scenes or sizes, thereby facilitating popularization of the doppler microwave detection device in a state where microwaves are invisible.

By way of example, reference is made to figure 7 of the accompanying drawings which illustrate the amplitude profile V to which the excitation signal is adjusted _L V _H One in the section hasWhen the excitation signal is adjusted to the current effective amplitude, the corresponding actual detection space and the detection height are H1, and the target detection space with the detection area S1 has better adaptability. Therefore, the effective amplitude V of the excitation signal is adjusted relative to the independent sensitivity adjustment mode _n In that the actual detection space bounded by the gradient boundaries can be adjusted on the basis of the change in the gradient boundaries, on the basis of the effective amplitudes V of the different excitation signals _n The adaptability of the corresponding actual detection space size to the target detection space of the corresponding scene or size, the adaptation relationship between the input information of the adjustment input unit 10 and the target detection space of the corresponding scene or size can be visually embodied, for example, the input information of the adjustment input unit 10 and the target detection space of the corresponding scene (e.g. highly reflective scene) or size (e.g. size represented by parameters such as height, area, diameter) adapted thereto are listed in a table form on the body or specification of the doppler microwave detection device in a product form, so as to facilitate a user to easily select an appropriate grade of the adjustment control circuit 20 according to the adaptation relationship between the input information of the adjustment input unit 10 and the target detection space of the corresponding scene or size for the target detection space of different scenes or sizes, thereby facilitating popularization of the doppler microwave detection device in a microwave invisible state.

By way of example, referring to fig. 8A to 8C of the drawings of the present specification, the application scenarios of the doppler microwave detection device of the present invention in the target detection space under different scenarios or sizes are illustrated. Corresponding to the microwave detection scenario in which the target detection space illustrated in fig. 8A and 8B is a small space (long and narrow space) or a high-reflection coefficient space, since the actual detection space of the doppler microwave detection device is not changed by independently adopting the sensitivity adjustment mode, the adjustment of the sensitivity cannot be solved in the state that the actual detection space is much larger than the target detection spaceInterference problems outside the target detection space and self-excited interference problems caused by multipath reflections. However by reducing the effective amplitude V of the excitation signal _n In this way, the actual detection space can be adjusted to be matched with the target detection space, so that the field intensity of the microwave beam outside the target detection space can be reduced, which is correspondingly beneficial to eliminating the environmental interference and the motion interference outside the target detection space, reducing the electromagnetic interference of the doppler microwave detection device to the outside of the target detection space, and reducing the radiation loss outside the target detection space to reduce the radiation power consumption of the microwave detection device. Meanwhile, the strength of an echo signal formed by reflection of the microwave beam by a wall, a glass or metal plate layer defining the target detection space can be reduced, so that the state of a high-reflection object exists in the target detection space and the state of a small non-open space in the target detection space are reduced, the probability of self-excitation interference generated by the Doppler microwave detection device based on multipath reflection is reduced, the occupation ratio of the microwave beam to the echo signal reflected by a movable object is correspondingly improved, and the stability and the accuracy of the Doppler microwave detection device in actual detection application are favorably guaranteed.

The detection space illustrated in fig. 8C is a microwave detection scene with an interference action, specifically, taking a curtain flutter type interference action as an example, because the signal corresponding to the curtain flutter action is close to the signal corresponding to the human body movement action in frequency in the corresponding doppler intermediate frequency signal, and in amplitude, because the reflection area of the curtain is larger than the reflection area of the human body, the signal amplitude corresponding to the curtain flutter action in the corresponding doppler intermediate frequency signal is larger than the signal amplitude corresponding to the human body movement action at the same distance, the curtain flutter action interference in the detection space cannot be eliminated in an independent sensitivity-reduction adjustment manner, and the effective amplitude V of the excitation signal is reduced _n In this way, the actual detection space can be adjusted to a region that does not contain curtain flutter, thereby eliminating curtain flutter interference.

It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the embodiments, and any variations or modifications may be made to the embodiments of the present invention without departing from the principles described.

Claims

1. A doppler microwave probe apparatus, comprising:

an adjustment input unit;

a frequency mixing unit; and

an antenna unit, wherein the antenna unit is electrically connected to the frequency mixing unit and fed to the excitation signal amplitude adjustment unit, so as to transmit a microwave beam corresponding to the frequency of the excitation signal in a state of being fed by the excitation signal output by the excitation signal amplitude adjustment unit to form an actual detection space, and receive a reflected echo formed by the microwave beam being reflected by a corresponding object in the actual detection space, so as to transmit an echo signal corresponding to the reflected echo to the frequency mixing unit, wherein the frequency mixing unit is further electrically connected to the voltage-controlled oscillation unit to access the excitation signal output by the voltage-controlled oscillation unit, and is configured to output a doppler intermediate frequency signal corresponding to the frequency/phase difference between the excitation signal and the echo signal in a frequency-mixing detection manner.

2. The doppler microwave detecting device according to claim 1, wherein the excitation signal amplitude adjusting unit includes at least two branch adjusting circuits, wherein each of the branch adjusting circuits includes a first MOS transistor and a second MOS transistor, wherein a source of the first MOS transistor of the same branch adjusting circuit is electrically connected to a drain of the second MOS transistor, a gate of the second MOS transistor of each of the branch adjusting circuits is electrically connected to the voltage-controlled oscillating unit, a source of the second MOS transistor of each of the branch adjusting circuits is grounded, a drain of the first MOS transistor of each of the branch adjusting circuits is electrically connected to the antenna unit and is connected to a positive power supply via a resistor/inductor, and a gate of the first MOS transistor of each of the branch adjusting circuits is electrically connected to the digital logic processing unit, so as to implement on and off control of the first MOS transistor of the corresponding branch adjusting circuit based on the input information transformation of the adjusting input unit, thereby implementing effective amplitude adjustment of the excitation signal output by the excitation signal amplitude adjusting unit.

3. The doppler microwave detecting device according to claim 1, wherein the excitation signal amplitude adjusting unit includes at least two branch adjusting circuits, wherein each of the branch adjusting circuits includes a first MOS transistor and a second MOS transistor, wherein a source of the first MOS transistor of the same branch adjusting circuit is electrically connected to a drain of the second MOS transistor, wherein a gate of the second MOS transistor of each of the branch adjusting circuits is electrically connected to the voltage-controlled oscillating unit, and a source of the second MOS transistor of each of the branch adjusting circuits is grounded, wherein a drain of the first MOS transistor of each of the branch adjusting circuits is electrically connected to the antenna unit and is connected to a positive power supply via a resistor/inductor, respectively, and a gate of the first MOS transistor of each of the branch adjusting circuits is electrically connected to the digital logic processing unit, respectively, wherein the second MOS transistor of each of the branch adjusting circuits is equivalently disposed with at least two MOS transistors connected in parallel to each other, so as to realize on/off of the first MOS transistor of the corresponding branch adjusting circuit based on the corresponding input information transformation of the adjusting input unit, thereby realizing effective amplitude adjustment of the excitation signal output of the branch adjusting circuit.

4. The doppler microwave detecting device according to claim 1, wherein the excitation signal amplitude adjusting unit comprises at least two branch adjusting circuits, wherein each of the branch adjusting circuits comprises a first MOS transistor and a second MOS transistor, wherein a source of the first MOS transistor of the same branch adjusting circuit is electrically connected to a drain of the second MOS transistor, wherein a gate of the second MOS transistor of each of the branch adjusting circuits is electrically connected to the voltage-controlled oscillating unit, a source of the second MOS transistor of each of the branch adjusting circuits is grounded, wherein a drain of the first MOS transistor of each of the branch adjusting circuits is respectively connected to a positive power supply via a first inductor, wherein each of the first inductors is coupled to a second inductor, wherein the second inductor is connected in parallel to one of two third inductors coupled to each other, the third inductor connected in parallel with the second inductor in the two third inductors is grounded, one end of the other third inductor is electrically connected to the antenna unit, and the other end of the other third inductor is grounded, so as to form a mutual coupling electrical connection relationship between the drain of the first MOS transistor of each branch adjusting circuit and the antenna unit, wherein the gate of the first MOS transistor of each branch adjusting circuit is electrically connected to the digital logic processing unit, respectively, so as to realize on and off control of the first MOS transistor of the corresponding branch adjusting circuit based on corresponding input information transformation of the adjusting input unit, and realize effective amplitude adjustment of the excitation signal output by the excitation signal amplitude adjusting unit.

5. The doppler microwave detecting device according to claim 1, wherein the excitation signal amplitude adjusting unit includes at least two branch adjusting circuits, wherein each of the branch adjusting circuits includes a branch MOS transistor and a branch inductor/resistor, wherein one end of the branch inductor/resistor of the same branch adjusting circuit is electrically connected to a drain of the branch MOS transistor, wherein the other end of the branch inductor/resistor of each of the branch adjusting circuits is electrically connected to the voltage-controlled oscillating unit and the antenna unit, and is connected to a positive electrode of a power supply through a resistor/inductor, a source of the branch MOS transistor of each of the branch adjusting circuits is grounded, and a gate of the branch MOS transistor of each of the branch adjusting circuits is electrically connected to the digital logic processing unit, so as to implement on and off control of the branch MOS transistor of the corresponding branch adjusting circuit based on input information transformation of the adjusting input unit, thereby implementing effective amplitude adjustment of the excitation signal output by the excitation signal amplitude adjusting unit.

6. The doppler microwave detecting device according to claim 1, wherein the excitation signal amplitude adjusting unit includes at least two branch adjusting circuits, wherein each of the branch adjusting circuits includes a branch resistor/inductor, a first MOS transistor and a second MOS transistor, wherein a source of the first MOS transistor of the same branch adjusting circuit is electrically connected to a drain of the second MOS transistor, a drain of the first MOS transistor of the same branch adjusting circuit is connected to a positive power supply via the branch resistor/inductor, a gate of the second MOS transistor of each branch adjusting circuit is electrically connected to the voltage-controlled oscillating unit, a source of the second MOS transistor of each branch adjusting circuit is electrically connected to the antenna unit and is grounded via a resistor/inductor, and a gate of the first MOS transistor of each branch adjusting circuit is electrically connected to the digital logic processing unit, so as to realize on-off control of the first MOS transistor of the corresponding branch adjusting circuit based on input information transformation of the adjusting input unit, thereby realizing effective amplitude adjustment of the excitation signal output by the excitation signal amplitude adjusting unit.

7. The doppler microwave detection device according to any one of claims 2 to 6, wherein at least one of the MOS transistors in the excitation signal amplitude adjustment unit is replaced with a triode based on the corresponding relationship between the gate, the drain and the source of the MOS transistor and the base, the collector and the emitter of the triode.

8. The doppler microwave detection device according to any one of claims 2 to 6, wherein the doppler microwave detection device further comprises an intermediate frequency amplifying unit and a signal processing unit, wherein the intermediate frequency amplifying unit is electrically connected to the frequency mixing unit to receive the doppler intermediate frequency signal from the frequency mixing unit and amplify the received doppler intermediate frequency signal, wherein the signal processing unit is electrically connected to the intermediate frequency amplifying unit to extract effective features of the doppler intermediate frequency signal based on corresponding threshold settings, wherein the logic processing unit is electrically connected to the signal processing unit to output corresponding control information according to the doppler intermediate frequency signal extracted by the signal processing unit.

9. The doppler microwave detection device according to claim 8, wherein the doppler microwave detection device further comprises a control unit, wherein the control unit is electrically connected to the logic processing unit to access the control information outputted from the logic processing unit, and outputs a corresponding control signal to the corresponding electrical device or executes a corresponding control action to control the operating state of the corresponding electrical device in a state of accessing the corresponding control information.

10. The doppler microwave detecting device according to claim 8, wherein the signal processing unit and the adjustment control circuit are respectively provided in an integrated circuit form and integrated into an MCU, and the mixing unit and the intermediate frequency amplifying unit are respectively provided in an integrated circuit form and integrated into a microwave chip with the feeding circuit.

11. The doppler microwave detecting device according to claim 8, wherein the signal processing unit and the adjustment control circuit are respectively provided in an integrated circuit form and are integrated into an MCU, the intermediate frequency amplifying unit is provided in an integrated circuit form and is integrated into a microwave chip with the feeding circuit, and wherein the mixing unit is externally disposed on the microwave chip.

12. The doppler microwave detecting device according to any one of claims 1 to 6, wherein the adjustment input unit is one selected from a group of mechanical switch input devices consisting of a dial switch, a code switch, a multi-step switch, and a dial switch.

13. Doppler microwave detection apparatus according to any of claims 1 to 6, wherein the adjustment input unit is arranged as an adjustable potentiometer.

14. Doppler microwave detection apparatus according to any of claims 1 to 6, wherein the adjustment input unit is arranged as a digital signal access device.

15. A detection boundary self-adaptive adjusting method of a Doppler microwave detection device is characterized by comprising the following steps:

s1, in an unmanned state in a target detection area, in a preset amplitude section V of an excitation signal _I V _II The effective amplitude V of the excitation signal is adjusted from large to small in a self-adaptive manner _n ；

S2, reading the corresponding effective amplitude V of the excitation signal _n The noise floor value A of the next Doppler intermediate frequency signal in frequency spectrum, energy spectrum, power spectrum or amplitude _k And comparing the read bottom noise value A of the Doppler intermediate frequency signal _k And a predetermined background noise value A ₀ At the read background noise value A of the Doppler intermediate frequency signal _k Less than or equal to the preset background noise value A ₀ In response to the amplitude V of said excitation signal _H Maximum amplitude of the excitation signal adapted to the current environment, and a base noise value A of the Doppler intermediate frequency signal read _k Establishing an environmental background noise value A under the current environment for the environmental background noise value _k And the amplitude section V of the excitation signal _I V _H Effective amplitude V of _n The corresponding information of (2);

s3, in the state that the movable object exists in the target detection area, in the amplitude section V _I V _H Adjusting the effective amplitude V of the excitation signal from small to large _n ；

S4, reading the corresponding effective amplitude V of the excitation signal _n The amplitude A of the Doppler intermediate frequency signal on the frequency spectrum, the energy spectrum, the power spectrum or the amplitude is obtained, and the read amplitude A of the Doppler intermediate frequency signal is compared with the effective amplitude V of the corresponding excitation signal _n Corresponding environment background noise value A _k The amplitude A of the Doppler intermediate frequency signal is read to be larger than the effective amplitude V of the corresponding excitation signal _n Corresponding environment background noise value A _k In response to the amplitude V of said excitation signal _L Determining an amplitude segment V for matching a minimum amplitude of said target detection space _L V _H Segment of said excitation signal adapted to the current circumstancesEffective amplitude V _n The adjustment range of (a); and

16. The method of claim 15, wherein the doppler microwave detection device comprises a feeding circuit, a mixing unit and an antenna unit, wherein the feeding circuit is configured as an integrated circuit and comprises a digital logic processing unit, a voltage-controlled oscillation unit and an excitation signal amplitude adjusting unit, wherein the voltage-controlled oscillation unit is electrically connected to the digital logic processing unit and the excitation signal amplitude adjusting unit at the same time to output the excitation signal of the corresponding frequency to the excitation signal amplitude adjusting unit under control of the digital logic processing unit, wherein the excitation signal amplitude adjusting unit is electrically connected to the antenna unit and electrically connected to the digital logic processing unit under control of the digital logic processing unit to adjust the effective amplitude of the excitation signal inputted from the voltage-controlled oscillation unit under control of the digital logic processing unit to output the excitation signal to the antenna unit, wherein the antenna unit is electrically connected to the mixing unit to emit a spatial frequency-related excitation signal corresponding to the frequency of the excitation signal outputted from the voltage-controlled oscillation unit and to form a spatial reflection signal corresponding to the echo detection signal transmitted by the mixing unit and an echo detection signal reflected by the echo signal transmitted by the echo detection unit in a spatial frequency difference between the echo detection unit and the echo detection signal transmitted by the echo detection unit A doppler intermediate frequency signal.

17. The adaptive detection boundary adjustment method for doppler microwave detection device according to claim 16, wherein the doppler microwave detection device further comprises an adjustment input unit and an adjustment control circuit, wherein the adjustment control circuit comprises an input identification unit, a logic processing unit and a communication interface unit, wherein the input identification unit is electrically connected to the adjustment input unit and the logic processing unit to identify the input information of the adjustment input unit and transmit the digital information corresponding to the input information to the logic processing unit, wherein the logic processing unit is pre-loaded with the corresponding hierarchical control command recognized by the digital logic processing unit and electrically connected to the communication interface unit to retrieve the corresponding hierarchical control command according to the digital information received from the input identification unit and transmit the corresponding hierarchical control command to the communication interface unit, wherein the feed circuit further comprises a communication interface module, wherein the communication interface module is electrically connected to the communication interface unit to receive the corresponding hierarchical control command from the communication interface unit, and wherein the digital logic processing unit is electrically connected to the communication interface module to receive the corresponding hierarchical control command and the amplitude adjustment signal from the communication interface module to adjust the effective amplitude of the voltage-controlled oscillation.