CN117031415B

CN117031415B - Microwave detector with fixed frequency conversion rule and anti-radiation interference method thereof

Info

Publication number: CN117031415B
Application number: CN202311301920.2A
Authority: CN
Inventors: 邹高迪; 邹明志; 孙毅
Original assignee: Shenzhen Merrytek Technology Co Ltd
Current assignee: Shenzhen Merrytek Technology Co Ltd
Priority date: 2023-10-10
Filing date: 2023-10-10
Publication date: 2024-01-16
Anticipated expiration: 2043-10-10
Also published as: CN117031415A

Abstract

The invention provides a microwave detector with a fixed frequency conversion rule and a radiation interference resistance method thereof, wherein the center frequency point of the microwave detector is dynamically and circularly regulated according to the fixed frequency conversion rule, and the frequency of electromagnetic waves emitted by the microwave detector is maintained to be dynamically circulated according to the fixed frequency conversion rule, so that the frequency of electromagnetic waves emitted by the microwave detector, and the probability that any electromagnetic radiation frequency of odd-order harmonic frequency and even-order harmonic frequency of the electromagnetic waves collides with the working frequency of other radio communication equipment in the same frequency manner, namely the probability that the microwave detector interferes with other radio communication equipment and the probability that the microwave detector is interfered by other electromagnetic radiation in the same frequency band are reduced, thereby being beneficial to improving the radiation interference resistance capability of the microwave detector.

Description

Microwave detector with fixed frequency conversion rule and anti-radiation interference method thereof

Technical Field

The invention relates to the field of microwave detection based on the Doppler effect principle, in particular to a microwave detector with a fixed frequency conversion rule and a radiation interference resistance 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, especially on the detection of the existence, movement and micro motion characteristics of people are becoming wider, wherein the microwave detection technology based on the Doppler effect principle is used as an important hinge connected with people and objects, has unique advantages in the behavior detection and existence detection technology, and can detect living animals such as the movement characteristics, movement characteristics and micro motion characteristics of people, even heartbeat and breathing characteristic information of people under the condition of not invading the privacy of people, so that the method has wide application prospect. Specifically, the corresponding microwave detector is fed by an excitation signal to emit a microwave beam with a frequency corresponding to the excitation signal to a corresponding target space, a detection area is formed in the target space, a reflected echo formed by the reflection of the microwave beam by a corresponding object in the detection area is received, and a Doppler intermediate frequency signal corresponding to the frequency/phase difference between the microwave beam and the reflected echo is output in a mixing detection mode, wherein based on the Doppler effect principle, when the object reflecting the microwave beam is in a moving state, the echo signal and the excitation signal have a certain frequency/phase difference, and the Doppler intermediate frequency signal presents corresponding amplitude fluctuation to feed back the corresponding human body, vehicle and other object activities.

ISM (Industrial Scientific Medical) Band is a Band defined by ITU-R (ITU Radiocommunication Sector, the international telecommunications union radio communication office) for use by institutions such as industry, science and medicine, where the bands applied to microwave detection are mainly 2.4 GHz, 5.8 GHz, 24.125 GHz, etc. of the bands opened by ITU-R, and when using these bands, the corresponding microwave detector needs to observe a certain transmitting power (generally, the transmitting power is lower than 1W) to reduce interference to other radio communication devices, although the definition and permission of different bands can specify the use Band of the radio to reduce the probability of mutual interference between radio communication devices of different bands, however, under the permission of limited Band resources, the problem of mutual interference between radios of adjacent or identical bands is increasing with the increase of the coverage rate of radios of adjacent bands or identical bands. For example: taking the 5.8 GHz band as an example, in addition to the microwave detector, radio communication devices such as 5G WIFI, unmanned aerial vehicle, ETC of expressway, and screen thrower of home may all operate in the band. The specific working frequency range of the 5.8 GHz-band microwave detector manufactured according to the existing supply chain production is 5725-5875 MHz, the working frequency range of 5G WIFI is 5150-5825 MHz, the two have 5725-5825 MHz shared frequency bands, and the problem of mutual interference between the existing microwave detector and the 5G WIFI is particularly serious in the shared frequency band range. On the one hand, the method is different from 5G WIFI, communication information is carried by the frequency/amplitude change of electromagnetic waves in a modulation mode, so that the same-frequency interference can be actively avoided based on the identification of electromagnetic wave signals in the same frequency band, and the Doppler intermediate frequency signal output by a microwave detector based on the Doppler effect principle in a frequency mixing detection mode can be inevitably interfered by electromagnetic radiation in the same frequency band as the reflection echo; on the other hand, although 5G WIFI can actively avoid co-frequency interference based on the identification of electromagnetic wave signals in the same frequency band, the electromagnetic radiation interference in the same frequency band still reduces the transmission speed and stability of the 5G WIFI network, and further reduces the user experience of related applications based on high-speed network transmission.

Particularly, in practical application of the microwave detector, in order to solve the same-frequency interference problem of the microwave detector in practical application, including the problem of mutual interference among a plurality of microwave detectors and the problem of mutual interference between the microwave detector and radio communication equipment, the technical scheme for judging the accuracy of the detection result based on the detection result change before and after frequency hopping of the microwave detector is proposed in advance. However, on the one hand, because of lack of knowledge of the channel mechanism in the communication field, the working frequency points before and after frequency modulation of the microwave detector may still be in the same channel of the radio communication device, so that an accurate detection result cannot be obtained, and meanwhile, the problem of mutual interference with the radio communication device cannot be solved; on the other hand, for the application scene of the multi-microwave detector, the frequency hopping action of any microwave detector is likely to cause butterfly effect type frequency hopping tide to generate continuous co-frequency interference; in addition, the accuracy of detection results is judged based on the change of detection results before and after frequency hopping of the microwave detector, so that the detection delay is increased, the intelligent control experience based on the microwave detection is reduced, and meanwhile, the performance of hardware and the complexity requirement of a logic program are improved, so that the method has higher implementation cost.

Disclosure of Invention

An object of the present invention is to provide a microwave probe with a fixed frequency conversion rule and a radiation interference resistance method thereof, wherein a center frequency point of the microwave probe is dynamically and circularly adjusted according to the fixed frequency conversion rule, and a frequency of an electromagnetic wave emitted by the microwave probe is maintained to be dynamically and circularly adjusted according to the fixed frequency conversion rule, so that a probability that any electromagnetic radiation frequency of odd-order, even-order harmonic frequency and double-frequency of the electromagnetic wave collides with an operating frequency of other radio communication equipment in the same frequency is reduced, that is, a probability that the microwave probe causes interference to other radio communication equipment and a probability that the microwave probe is interfered by other electromagnetic radiation in the same frequency band are reduced.

Another object of the present invention is to provide a microwave probe with a fixed frequency conversion rule and a method for resisting radiation interference thereof, in which the frequency of electromagnetic waves emitted by the microwave probe is maintained in a dynamic circulation state according to the fixed frequency conversion rule, and the probability of interference of the microwave probe to other radio communication devices and the probability of interference of electromagnetic radiation in the same frequency band are both reduced, thereby being beneficial to improving the radiation interference resistance of the microwave probe.

Another object of the present invention is to provide a microwave probe with a fixed frequency conversion rule and a method for resisting radiation interference, wherein the microwave probe transmits electromagnetic waves to a detection area and receives corresponding echoes based on a doppler effect principle, and generates a doppler intermediate frequency signal based on a frequency/phase difference between the transmitted electromagnetic waves and the corresponding echoes in a mixing detection manner, so that the doppler intermediate frequency signal is a response to a motion of an object in the detection area.

Another object of the present invention is to provide a microwave probe with a fixed frequency conversion rule and a method for resisting radiation interference thereof, in which the frequency of an electromagnetic wave emitted by the microwave probe is maintained in a dynamic circulation state according to the fixed frequency conversion rule, even if the dynamic circulation frequency has the same frequency as the operating frequency of other radio communication devices, the amplitude fluctuation corresponding to the same frequency interference in the doppler intermediate frequency signal can be easily identified and/or filtered according to the existing signal processing manner based on the narrow pulse shape of the fixed frequency conversion rule, thereby being beneficial to ensuring the accuracy of the response of the doppler intermediate frequency signal to the movement of an object in the detection area, and correspondingly improving the capability of resisting radiation interference of the microwave probe.

Another object of the present invention is to provide a microwave probe with a fixed frequency conversion rule and a radiation interference resistance method thereof, wherein the frequency of an electromagnetic wave emitted by the microwave probe is maintained in a dynamic circulation state according to the fixed frequency conversion rule, even if the dynamic circulation frequency has the same frequency as the working frequency of other radio communication devices, the same frequency interference time of the electromagnetic wave emitted by the microwave probe to the corresponding radio communication device is within the tolerance mechanism allowable range of the radio communication device based on the fixed frequency conversion rule, so that the interference time cannot intuitively influence the user of the related application, thereby being beneficial to guaranteeing the user experience of the related application.

Another object of the present invention is to provide a microwave probe having a fixed frequency conversion rule and a radiation interference resistance method thereof, in which the frequency of electromagnetic waves emitted from the microwave probe is maintained in a state of dynamic circulation in the fixed frequency conversion rule, and the influence of the variation of the frequency of electromagnetic waves emitted from the microwave probe on the amplitude fluctuation of the doppler intermediate frequency signal is fixed, i.e., fixed or exhibits a fixed variation rule without affecting the recognition of the amplitude fluctuation corresponding to the movement of the object in the detection region in the doppler intermediate frequency signal, thereby being capable of maintaining the accuracy and instantaneity of the feedback of the doppler intermediate frequency signal on the movement of the object in the detection region.

The invention further aims to provide a microwave detector with a fixed frequency conversion rule and a radiation interference resistance method thereof, wherein the center frequency point of the microwave detector is dynamically and circularly regulated according to the fixed frequency conversion rule, namely, the dynamic and circular regulation of the frequency of electromagnetic waves emitted by the microwave detector is not dependent on the identification of corresponding received echo signals and the monitoring of the generated Doppler intermediate frequency signals, thus being different from the channel hopping technology and the frequency modulation technology in the communication field and the technical scheme of judging the accuracy of detection results based on the detection result change before and after the frequency hopping of the microwave detector in the field.

Another object of the present invention is to provide a microwave probe with a fixed frequency conversion rule and an anti-radiation interference method thereof, wherein a center frequency point of the microwave probe is dynamically and circularly adjusted according to the fixed frequency conversion rule, wherein the fixed frequency conversion rule is described according to a time-dependent variation line type of the center frequency point of the microwave probe, the fixed frequency conversion rule satisfies that a continuous duration of the center frequency point of the microwave probe in any 2MHz frequency bandwidth range is not more than 1s, and an accumulated duration of the center frequency point of the microwave probe in any 5MHz frequency bandwidth range is not more than 1s, so that when a dynamic cyclic frequency exists at a same frequency as an operating frequency of other radio communication devices, amplitude fluctuation corresponding to co-frequency interference in the doppler intermediate frequency signal is in a narrow pulse form based on the fixed frequency conversion rule, and the co-frequency interference time of the electromagnetic wave emitted by the microwave probe to the corresponding radio communication device cannot intuitively influence a user in a fault tolerance mechanism allowable range of the radio communication device.

Another object of the present invention is to provide a microwave probe with a fixed frequency conversion rule and a radiation interference resistance method thereof, wherein the microwave probe includes an antenna unit, a voltage-controlled oscillation unit, a frequency mixing detection unit, and an MCU, wherein the antenna unit is electrically connected to the voltage-controlled oscillation unit to emit a corresponding microwave beam in a state of being fed by the voltage-controlled oscillation unit, and to receive a reflected echo formed by the microwave beam being reflected by a corresponding object, wherein the frequency mixing detection unit is electrically connected to the voltage-controlled oscillation unit and the antenna unit to output the doppler intermediate frequency signal corresponding to a frequency/phase difference between the microwave beam and the reflected echo by means of frequency mixing detection, wherein the MCU is electrically connected to the voltage-controlled oscillation unit, a center frequency point of an output frequency of the voltage-controlled oscillation unit is associated with an output voltage of the voltage-controlled oscillation unit by the MCU, and a center frequency point of the microwave probe is associated with an output voltage of the voltage-controlled oscillation unit by the MCU, wherein the output voltage of the voltage-controlled oscillation unit is fixedly connected to the voltage-mixing detection unit to output the doppler intermediate frequency signal corresponding to a frequency/phase difference between the microwave beam and the reflected echo, so that the frequency conversion rule can be adjusted by the frequency mixing detection rule is fixed to the frequency conversion rule.

Another object of the present invention is to provide a microwave detector with a fixed frequency conversion rule and a method for resisting radiation interference thereof, wherein the microwave detector includes an antenna unit, a voltage-controlled oscillation unit, a frequency-mixing detection unit, a controllable variable capacitance array and a digital logic unit with a register, wherein the controllable variable capacitance array is electrically connected to the voltage-controlled oscillation unit, so that a center frequency point of an output frequency of the voltage-controlled oscillation unit is associated with a capacitance parameter of the controllable variable capacitance array, wherein the antenna unit is fed and connected to the voltage-controlled oscillation unit, so as to emit a corresponding microwave beam in a state fed by the voltage-controlled oscillation unit, and receive a reflected echo formed by reflecting the microwave beam by a corresponding object, wherein the frequency-mixing detection unit is electrically connected to the voltage-controlled oscillation unit and the antenna unit, so as to output a doppler intermediate frequency signal corresponding to a frequency/phase difference between the microwave beam and the reflected echo by frequency-mixing detection, wherein the digital logic unit is configured to control a capacitance parameter of the controllable variable capacitance array based on a register value of the register, so that the center frequency of the voltage-mixing detection unit can be configured based on the corresponding value of the register.

Another object of the present invention is to provide a microwave probe with a fixed frequency conversion rule and a method for resisting radiation interference thereof, wherein the microwave probe further includes an MCU, wherein the MCU is electrically connected to the digital logic unit, and is configured to cyclically configure register values of registers of the digital logic unit with a fixed assignment rule, so that a center frequency point of the microwave probe can be dynamically cyclically adjusted with the fixed frequency conversion rule corresponding to the fixed assignment rule.

Another objective of the present invention is to provide a microwave probe with a fixed frequency conversion rule and a radiation interference resistance method thereof, wherein the controllable variable capacitance array includes a plurality of controllable insertion capacitance units, wherein each of the controllable insertion capacitance units is configured in a switchable capacitive load form, wherein in a state in which the controllable variable capacitance array is electrically connected to the voltage-controlled oscillation unit, each of the controllable insertion capacitance units is electrically connected between the voltage-controlled oscillation unit and ground, such that a center frequency point of an output frequency of the voltage-controlled oscillation unit is associated with a capacitance parameter of the controllable variable capacitance array, and allows a capacitance parameter of the controllable variable capacitance array to be formed based on a switching state change of a corresponding controllable insertion capacitance unit, wherein the digital logic unit is configured to control the switching state of the corresponding controllable insertion capacitance unit based on a register value of the register thereof, thereby controlling the capacitance parameter of the controllable variable capacitance array.

Another object of the present invention is to provide a microwave detector with a fixed frequency conversion rule and a radiation interference resistance method thereof, wherein in a state that the controllable variable capacitance array is electrically connected to the voltage-controlled oscillation unit, each of the controllable insertion capacitance units is electrically connected between the voltage-controlled oscillation unit and the ground, so that a central frequency point of an output frequency of the voltage-controlled oscillation unit is associated with a state of a capacitance parameter of the controllable variable capacitance array, so that a switching state of the corresponding controllable insertion capacitance unit is controlled without affecting parameters of a resonant circuit of the voltage-controlled oscillation unit, thereby guaranteeing an association accuracy of the capacitance parameter of the controllable variable capacitance array and the central frequency point of the output frequency of the voltage-controlled oscillation unit in a state of guaranteeing a working stability of the voltage-controlled oscillation unit, and further enabling the central frequency point of the microwave detector to be accurately set according to configurations of different register values.

Another objective of the present invention is to provide a microwave probe with a fixed frequency conversion rule and a radiation interference resistance method thereof, wherein each of the controllable insertion capacitor units has a field effect transistor, wherein in a state that the controllable variable capacitance array is electrically connected to the voltage-controlled oscillating unit, a drain electrode of the field effect transistor is electrically connected to the voltage-controlled oscillating unit, and a source electrode of the field effect transistor is grounded, so as to form a capacitance parameter variation of the controllable variable capacitance array based on an on/off state variation of the corresponding field effect transistor, wherein the digital logic unit is configured to control a capacitance parameter of the controllable insertion capacitor unit based on a register value of a register thereof.

Another object of the present invention is to provide a microwave detector with a fixed frequency conversion rule and a radiation interference resistance method thereof, wherein in a state that the controllable variable capacitance array is electrically connected to the voltage-controlled oscillating unit, a drain electrode of the field effect transistor is electrically connected to the voltage-controlled oscillating unit, and a source electrode of the field effect transistor is grounded, so that on/off state control of the corresponding field effect transistor does not affect parameters of a resonant circuit of the voltage-controlled oscillating unit, thereby guaranteeing correlation accuracy of capacitance parameters of the controllable variable capacitance array and a center frequency point of an output frequency of the voltage-controlled oscillating unit in a state of guaranteeing working stability of the voltage-controlled oscillating unit, and further enabling the center frequency point of the microwave detector to be accurately set according to configurations of different register values.

According to one aspect of the present invention, there is provided a microwave probe having a fixed frequency conversion rule, the microwave probe comprising:

an antenna unit;

the antenna unit is connected to the voltage-controlled oscillation unit in a feeding way, so as to emit corresponding microwave beams in a feeding state of the voltage-controlled oscillation unit and receive reflection echoes formed by the reflection of the microwave beams by corresponding objects;

A mixing detection unit, wherein the mixing detection unit is electrically connected to the voltage-controlled oscillation unit and the antenna unit, so as to output the Doppler intermediate frequency signal corresponding to the frequency/phase difference between the microwave beam and the reflected echo in a mixing detection manner;

and the MCU is arranged to dynamically and circularly adjust the central frequency point of the output frequency of the voltage-controlled oscillation unit according to a fixed frequency conversion rule, so that the central frequency point of the microwave detector can be dynamically and circularly adjusted according to the fixed frequency conversion rule, wherein the fixed frequency conversion rule satisfies that the continuous duration of the central frequency point of the microwave detector in any 2MHz frequency bandwidth range is not more than 1s, and the cumulative duration of the central frequency point of the microwave detector in any 5MHz frequency bandwidth range is not more than 1s.

In an embodiment, the center frequency point of the microwave detector is dynamically and circularly adjusted according to the fixed frequency conversion rule to have a cycle period, and the center frequency point of the microwave detector is stepwise changed with time in the cycle period.

In an embodiment, the center frequency point of the microwave detector is dynamically and circularly adjusted according to the fixed frequency conversion rule to have a cycle period, and the center frequency point of the microwave detector changes linearly with time in the cycle period.

In an embodiment, the center frequency point of the microwave detector is dynamically and circularly adjusted according to the fixed frequency conversion rule to have a cycle period, and the center frequency point of the microwave detector is linearly changed stepwise with time in the cycle period.

In an embodiment, the MCU is electrically connected to the voltage-controlled oscillating unit, a center frequency point of an output frequency of the voltage-controlled oscillating unit is related to an output voltage of the MCU to the voltage-controlled oscillating unit, and a center frequency point of the corresponding microwave detector is related to an output voltage of the MCU to the voltage-controlled oscillating unit, where the output voltage of the MCU to the voltage-controlled oscillating unit is set according to a fixed transformation rule, so that the center frequency point of the microwave detector can be dynamically and circularly adjusted according to the fixed transformation rule corresponding to the fixed transformation rule.

In an embodiment, the microwave probe further comprises a controllable variable capacitance array and a digital logic unit having a register, wherein the controllable variable capacitance array is electrically connected to the voltage controlled oscillation unit such that a center frequency point of an output frequency of the voltage controlled oscillation unit is associated with a capacitance parameter of the controllable variable capacitance array, wherein the digital logic unit is arranged to control the capacitance parameter of the controllable variable capacitance array based on a register value of its register such that a center frequency point of an output frequency of the voltage controlled oscillation unit can be set based on a corresponding register value of the register such that the center frequency point of the microwave probe can be adjusted according to a configuration of the corresponding register value of the register, wherein the MCU is electrically connected to the digital logic unit, and is arranged to cyclically configure the register value of the register of the digital logic unit with a fixed assignment rule, the center frequency point of the microwave probe corresponding to be dynamically adjusted with the fixed assignment rule corresponding to the fixed assignment rule.

In an embodiment, the voltage-controlled oscillation unit has two N-channel MOS transistors, two P-channel MOS transistors, an oscillation inductor and an oscillation capacitor, wherein sources of the two N-channel MOS transistors are electrically connected, sources of the two P-channel MOS transistors are electrically connected, two drains of the two N-channel MOS transistors are respectively electrically connected to drains of different P-channel MOS transistors, so as to form a sequential connection relationship that the drains of one of the N-channel MOS transistors are electrically connected to the drains of the other P-channel MOS transistor, the sources of the other P-channel MOS transistor are electrically connected to the drains of the other P-channel MOS transistor, the sources of the other N-channel MOS transistor are electrically connected to the drains of the former N-channel MOS transistor, wherein the gates of any one of the two N-channel MOS transistors are electrically connected to the drains of the other N-channel MOS transistor, the two P-channel MOS transistors are electrically connected to the two ends of the oscillation capacitor in parallel, and the two ends of the oscillation capacitor are not connected to the two ends of the oscillation inductor and the two oscillation capacitor are respectively connected in parallel.

In an embodiment, the controllable variable capacitance array includes a plurality of controllable insertion capacitance units, wherein each of the controllable insertion capacitance units is configured as a capacitive load capable of being controlled by a switch, wherein in a state in which the controllable variable capacitance array is electrically connected to the voltage-controlled oscillation unit, each of the controllable insertion capacitance units is electrically connected between a resonant tank of the voltage-controlled oscillation unit and one end of a power supply terminal, so that a center frequency point of an output frequency of the voltage-controlled oscillation unit is associated with a capacitance parameter of the controllable variable capacitance array, and allows a capacitance parameter change of the controllable variable capacitance array to be formed based on a switching state change of a corresponding controllable insertion capacitance unit, and wherein the digital logic unit is configured to control the switching state of the corresponding controllable insertion capacitance unit based on a register value of a register thereof, so as to control the capacitance parameter of the controllable variable capacitance array.

In an embodiment, each of the controllable insertion capacitor units has a field effect transistor, wherein in a state that the controllable variable capacitance array is electrically connected to the voltage-controlled oscillation unit, two ends of the field effect transistor, which are connected by a drain and a source, are electrically connected between a resonant tank of the voltage-controlled oscillation unit and one end of a power supply end, so as to form a capacitance parameter variation of the controllable variable capacitance array based on an on/off state variation of the corresponding field effect transistor, wherein the digital logic unit is configured to control a capacitance parameter of the controllable variable capacitance array based on an on/off state of the field effect transistor of the corresponding controllable insertion capacitor unit.

In an embodiment, each of the controllable insertion capacitor units further includes a capacitor, wherein the field effect transistor is electrically connected to one end of a resonant circuit or a power supply end of the voltage-controlled oscillation unit through the capacitor, so as to set a capacitance parameter variation amount formed by the controllable insertion capacitor unit based on/off state variation of the field effect transistor based on parameter setting of the capacitor.

In an embodiment, each of the controllably inserted capacitive units further includes an inductor connected in series with the capacitor to reduce an effect of the capacitance characteristic of the field effect transistor on the capacitance parameter of the corresponding controllably inserted capacitive unit based on the setting of the inductor.

According to another aspect of the present invention, there is also provided a method for resisting radiation interference of a microwave probe, the method for resisting radiation interference of a microwave probe including the steps of:

A. dynamically and circularly adjusting the central frequency point of the microwave detector according to a fixed frequency conversion rule, wherein the fixed frequency conversion rule meets the requirements that the continuous duration of the central frequency point of the microwave detector in any 2MHz frequency bandwidth range is not more than 1s, and the accumulated duration of the central frequency point of the microwave detector in any 5MHz frequency bandwidth range in any 5s continuous duration range is not more than 1s;

B. The microwave detector emits a microwave beam with the central frequency point and receives an echo formed by the reflection of the microwave beam by a corresponding object; and

C. a doppler intermediate frequency signal corresponding to the frequency/phase difference between the microwave beam emitted by the microwave probe and the received echo is generated in a frequency-mixing detection manner.

In an embodiment, in step a, the center frequency point of the microwave detector is dynamically and circularly adjusted according to the fixed frequency conversion rule to have a cycle period, and the center frequency point of the microwave detector is stepwise changed with time in the cycle period.

In an embodiment, in step a, the center frequency point of the microwave detector is dynamically and circularly adjusted according to the fixed frequency conversion rule to have a cycle period, and the center frequency point of the microwave detector changes linearly with time in the cycle period.

In an embodiment, in step a, the center frequency point of the microwave detector is dynamically and circularly adjusted according to the fixed frequency conversion rule to have a cycle period, and the center frequency point of the microwave detector is linearly changed stepwise over time in the cycle period.

Further objects and advantages of the present invention will become fully apparent from the following description and the accompanying drawings.

Drawings

Fig. 1 is a schematic block diagram of a microwave probe with fixed frequency conversion rules according to an embodiment of the invention.

Fig. 2 is a schematic circuit diagram of the microwave probe according to the above embodiment of the invention.

Fig. 3 is a schematic diagram of another circuit principle of the microwave probe according to the above embodiment of the invention.

Fig. 4 is a schematic diagram of the microwave probe according to the above embodiment of the invention, in which the center frequency is dynamically and circularly adjusted to have a step change.

Fig. 5 is a schematic diagram illustrating a linear change of the center frequency of the microwave probe according to the above embodiment of the invention by dynamic cyclic adjustment.

Fig. 6 is a schematic diagram of the center frequency of the microwave probe according to the above embodiment of the invention being dynamically and circularly adjusted to have a stepwise linear change.

Fig. 7 is a schematic block diagram of a microwave probe with fixed frequency conversion rule according to another embodiment of the present invention.

Fig. 8 is a schematic diagram of a part of the circuit of the microwave probe according to the above embodiment of the invention.

Fig. 9A is a schematic circuit diagram of the circuit principle of the microwave probe according to the above embodiment of the invention.

Fig. 9B is a schematic diagram of another circuit structure of the circuit principle of the microwave probe according to the above embodiment of the invention.

Fig. 9C is a schematic diagram of another circuit structure of the circuit principle of the microwave probe according to the above embodiment of the invention.

Description of the embodiments

The following description is presented to enable one of ordinary skill in the art to make and use the invention. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.

It will be understood that the terms "a" and "an" should be interpreted as referring to "at least one" or "one or more," i.e., in one embodiment, the number of elements may be one, while in another embodiment, the number of elements may be plural, and the term "a" should not be interpreted as limiting the number.

The invention provides a microwave detector with a fixed frequency conversion rule and a radiation interference resistance method thereof, wherein the center frequency point of the microwave detector is dynamically and circularly regulated according to the fixed frequency conversion rule, and the frequency of electromagnetic waves emitted by the microwave detector is maintained to be dynamically circulated according to the fixed frequency conversion rule, so that the frequency of electromagnetic waves emitted by the microwave detector, and the probability that any electromagnetic radiation frequency of odd-order harmonic frequency and even-order harmonic frequency of the electromagnetic waves collides with the working frequency of other radio communication equipment in the same frequency is reduced, namely the probability that the microwave detector causes interference to other radio communication equipment and the probability that the microwave detector is interfered by other electromagnetic radiation in the same frequency band are reduced, thereby being beneficial to improving the radiation interference resistance capability of the microwave detector.

Specifically, the microwave detector emits electromagnetic waves to a detection area and receives corresponding echoes based on a doppler effect principle, and generates a doppler intermediate frequency signal based on a frequency/phase difference between the emitted electromagnetic waves and the corresponding echoes in a mixing detection manner, so that the doppler intermediate frequency signal is a response to the motion of an object in the detection area, wherein the frequency of the electromagnetic waves emitted by the microwave detector is maintained to be dynamically circulated according to the fixed frequency conversion rule, that is, the dynamic circulation adjustment of the frequency of the electromagnetic waves emitted by the microwave detector is not dependent on the identification of the received corresponding echo signals, nor the monitoring of the generated doppler intermediate frequency signal, thus distinguishing the technical scheme of judging the accuracy of the detection result based on the change of the detection result before and after the frequency hopping of the microwave detector in the field.

As an example, referring to fig. 1 of the drawings, a block diagram of a microwave probe according to an embodiment of the present invention is illustrated, wherein the microwave probe comprises an antenna unit 10, a voltage controlled oscillation unit 20, a frequency mixing detection unit 30 and an MCU40, wherein the antenna unit 10 is electrically connected to the voltage controlled oscillation unit 20 to transmit a corresponding microwave beam in a state of being fed by the voltage controlled oscillation unit 20, and to receive a reflected echo formed by the microwave beam being reflected by a corresponding object, wherein the frequency mixing detection unit 30 is electrically connected to the voltage controlled oscillation unit 20 and the antenna unit 10 to output the doppler intermediate frequency signal corresponding to a frequency/phase difference between the microwave beam and the reflected echo by frequency mixing detection, wherein a center frequency point of an output frequency of the voltage controlled oscillation unit 20 is controlled by the MCU40, wherein the MCU40 is configured to dynamically cycle-adjust the center frequency point of the output frequency of the voltage controlled oscillation unit 20 in the state of being fed by the voltage controlled oscillation unit 20, so that the center frequency point of the microwave probe can be dynamically cycle-adjusted in the fixed frequency conversion rule.

In particular, in this embodiment of the present invention, the MCU40 is electrically connected to the voltage-controlled oscillating unit 20, a center frequency point of an output frequency of the voltage-controlled oscillating unit 20 is related to an output voltage of the MCU40 to the voltage-controlled oscillating unit 20, and a center frequency point of the microwave probe is related to an output voltage of the MCU40 to the voltage-controlled oscillating unit 20, wherein the output voltage of the MCU40 to the voltage-controlled oscillating unit 20 is set according to a fixed transformation rule, so that the center frequency point of the microwave probe can be dynamically and cyclically adjusted according to the fixed transformation rule corresponding to the fixed transformation rule.

As an example, referring to fig. 2 and 3 of the drawings in the specification of the present invention, circuit structures of the voltage-controlled oscillating unit 20 with different circuit principles are respectively illustrated, specifically, in the circuit of the voltage-controlled oscillating unit 20 illustrated in fig. 2, the voltage-controlled oscillating unit 20 is provided with varactors Vc1 and Vc2 based on a basic function of implementing voltage-controlled oscillation, and the center frequency point of the output frequency of the voltage-controlled oscillating unit 20 is associated with the output voltage of the MCU40 to the voltage-controlled oscillating unit 20 corresponding to the state that the Vtune end illustrated in the drawing of the voltage-controlled oscillating unit 20 is electrically connected to the MCU40, so that in the state that the output voltage of the MCU40 to the voltage-controlled oscillating unit 20 is set according to the fixed transformation rule, for example, the state that the voltage-controlled oscillating unit 20 is set according to the fixed linear transformation rule, the linear adjustment of the capacitance of the varactors Vc1 and Vc2 is implemented, and the center frequency point of the microwave detector is dynamically and circularly adjusted according to the linear transformation rule corresponding to the fixed transformation rule.

In the circuit of the voltage-controlled oscillating unit 20 illustrated in fig. 3, the voltage-controlled oscillating unit 20 is provided with two sets of coupling transmission lines CTL1 and CTL2 based on the basic function of implementing voltage-controlled oscillation, for example, two microstrip transmission lines that are coupled to each other form a set of coupling transmission lines, and the central frequency point of the output frequency of the voltage-controlled oscillating unit 20 can be related to the output voltage of the voltage-controlled oscillating unit 20 by the MCU40 corresponding to the state that the Vtune end of the voltage-controlled oscillating unit 20 is electrically connected to the MCU40, so that in the state that the output voltage of the MCU40 to the voltage-controlled oscillating unit 20 is set according to the fixed transformation rule, for example, the state that the output voltage of the MCU40 is set according to the fixed transformation rule, the linear adjustment of equivalent capacitance and/or equivalent inductance values represented by the two sets of coupling transmission lines CTL1 and CTL2 is implemented, and the central frequency point of the microwave detector is dynamically and circularly adjusted according to the linear transformation rule corresponding to the fixed transformation rule.

It should be noted that the circuit structures of the voltage-controlled oscillating unit 20 of the different circuit principles illustrated in fig. 2 and 3 are merely examples to show the enforcability of the center frequency point of the output frequency of the voltage-controlled oscillating unit 20 to the output voltage of the voltage-controlled oscillating unit 20 in principle, wherein the specific circuit structure of the voltage-controlled oscillating unit 20 corresponding to the structure principle varies variously, and the specific circuit structure of the voltage-controlled oscillating unit 20 does not limit the present invention when the center frequency point of the output frequency of the voltage-controlled oscillating unit 20 is functionally satisfied by the MCU40 to the output voltage of the voltage-controlled oscillating unit 20 under the block diagram structure of the microwave detector illustrated in fig. 1.

Corresponding to the block diagram structure of the microwave probe illustrated in fig. 1, when the output voltage of the MCU40 to the voltage controlled oscillating unit 20 is set with a stepped voltage having a fixed transformation rule, the center frequency point of the microwave probe can be dynamically cyclically adjusted with the fixed transformation rule corresponding to the fixed transformation rule, such as being dynamically cyclically adjusted with the stepped transformation rule corresponding to fig. 4; when the output voltage of the MCU40 to the voltage controlled oscillation unit 20 is set with a linear analog voltage having a fixed transformation rule, the center frequency point of the microwave probe can be dynamically cyclically adjusted with the fixed frequency conversion rule corresponding to the fixed transformation rule, as in fig. 5 with a linear frequency conversion rule; when the output voltage of the MCU40 to the voltage controlled oscillation unit 20 is set with a pulse integral voltage having a fixed transformation rule, the center frequency point of the microwave probe can be dynamically cyclically adjusted with the fixed transformation rule corresponding to the fixed transformation rule, such as dynamically cyclically adjusted with a stepwise transformation rule corresponding to fig. 4, or dynamically cyclically adjusted with a linear transformation rule corresponding to fig. 5, or dynamically cyclically adjusted with a stepwise linear transformation rule corresponding to fig. 6.

It will be appreciated that in this or other embodiments of the present invention, for the microwave probe of the product form, the dynamic cyclic adjustment of the center frequency point of the output frequency of the voltage controlled oscillating unit 20 by the MCU40 may be performed automatically in the state that the product is powered up, or may be performed manually in the state that the product is powered up, which is not limited by the present invention.

Referring further to fig. 7 of the drawings, a block diagram of a microwave probe according to another embodiment of the present invention is illustrated, wherein the microwave probe includes an antenna unit 10A, a voltage-controlled oscillation unit 20A, a frequency mixing detection unit 30A, and an MCU40A, wherein the antenna unit 10A is electrically connected to the voltage-controlled oscillation unit 20A to emit a corresponding microwave beam in a state of being fed by the voltage-controlled oscillation unit 20A, and to receive a reflected echo formed by the reflection of the microwave beam by a corresponding object, wherein the frequency mixing detection unit 30A is electrically connected to the voltage-controlled oscillation unit 20A and the antenna unit 10A to output doppler signals corresponding to frequency/phase differences between the microwave beam and the reflected echo by frequency mixing detection, wherein a center frequency point of an output frequency of the voltage-controlled oscillation unit 20A is controlled by the MCU40A, wherein the MCU40A is configured to dynamically and circularly adjust the center frequency point of the output frequency of the voltage-controlled oscillation unit 20A in a fixed frequency-variable manner so that the frequency mixing detection unit can dynamically adjust the center frequency point of the microwave probe in a fixed frequency-variable manner.

Specifically, in this embodiment of the present invention, the microwave probe further comprises a controllable variable capacitance array 50A and a digital logic unit 60A having a register 601A, wherein the controllable variable capacitance array 50A is electrically connected to the voltage controlled oscillation unit 20A such that a center frequency point of an output frequency of the voltage controlled oscillation unit 20A is associated with a capacitance parameter of the controllable variable capacitance array 50A, wherein the digital logic unit 60A is configured to control the capacitance parameter of the controllable variable capacitance array 50A based on a register value of the register 601A thereof such that the center frequency point of the output frequency of the voltage controlled oscillation unit 20A is capable of being set based on a corresponding register value of the register 601A such that the center frequency point of the microwave probe is capable of being adjusted according to a configuration of the corresponding register value of the register 601A, wherein the MCU40A is electrically connected to the digital logic unit 60A and is configured to fixedly assign a value of the register 601 to the digital logic unit 60A such that the center frequency point of the microwave probe is capable of being adjusted according to a fixed value of the fixed rule.

Specifically, referring to fig. 8 of the drawings, a partial circuit principle of the microwave probe according to this embodiment of the present invention is illustrated, wherein the controllable variable capacitance array 50A includes a plurality of controllable insertion capacitance units 501A, wherein each of the controllable insertion capacitance units 501A is configured in a capacitive load configuration capable of being controlled by a switch, wherein in a state in which the controllable variable capacitance array 50A is electrically connected to the voltage controlled oscillation unit 20A, each of the controllable insertion capacitance units 501A is electrically connected between a resonant tank circuit of the voltage controlled oscillation unit 20A and one end of a power supply terminal, such that a center frequency point of an output frequency of the voltage controlled oscillation unit 20A is associated with a capacitance parameter of the controllable variable capacitance array 50A, and allows a capacitance parameter change of the controllable variable capacitance array 50A to be formed based on a switching state change of the corresponding controllable insertion capacitance unit 501A, wherein the digital logic unit 60A is configured to control the controllable variable capacitance array 50A of the corresponding controllable insertion capacitance unit 501A based on a register value of the register 601A thereof.

It should be noted that, in the state that the controllable variable capacitance array 50A is electrically connected to the voltage-controlled oscillating unit 20A, each controllable insert capacitance unit 501A is electrically connected between the resonant circuit of the voltage-controlled oscillating unit 20A and one end of the power supply end, so that the central frequency point of the output frequency of the voltage-controlled oscillating unit 20A is related to the state of the capacitance parameter of the controllable variable capacitance array 50A, so that the on-off state control of the corresponding controllable insert capacitance unit 501A does not affect the resonant circuit parameter of the voltage-controlled oscillating unit 20A, and thus the correlation accuracy of the capacitance parameter of the controllable variable capacitance array 50A and the central frequency point of the output frequency of the voltage-controlled oscillating unit 20A is ensured in the state of ensuring the working stability of the voltage-controlled oscillating unit 20A, and further, the central frequency point of the microwave detector can be accurately set according to the configuration of different register values.

Further, referring to fig. 9A to 9C of the drawings of the specification of the present invention, different circuit configurations of the microwave probe according to this embodiment of the present invention based on the above-described circuit principle are illustrated.

Specifically, in these circuit structures of the microwave probe based on the above circuit principle of this embodiment of the present invention, each of the controllably inserted capacitive units 501A has a field effect transistor 5011A, wherein in a state in which the controllably variable capacitive array 50A is electrically connected to the voltage controlled oscillating unit 20A, both ends of the field effect transistor 5011A, which are connected with a drain and a source, are electrically connected between a resonant tank and one end of a power supply terminal of the voltage controlled oscillating unit 20A, a drain of the field effect transistor 5011A is electrically connected to the voltage controlled oscillating unit 20A, and a source of the field effect transistor 5011A is grounded, so that a capacitance parameter change of the controllably variable capacitive array 50A is formed based on an on/off state change of the corresponding field effect transistor 5011A, wherein the digital logic unit 60A is configured to control the capacitance parameter change of the controllably variable capacitive array 50A based on a register value of the register 601A.

For example, in fig. 9A to 9C, corresponding to a circuit connection state in which two ends of the field effect transistor 5011A having a drain and a source as connection terminals are electrically connected to one end of a resonant tank and a power supply terminal of the voltage controlled oscillation unit 20A, two ends of the field effect transistor 5011A having a drain and a source as connection terminals are electrically connected to a resonant tank and a negative power supply terminal of the voltage controlled oscillation unit 20A. Optionally, in other embodiments of the present invention, the two ends of the field effect transistor 5011A with the drain and the source as the connection terminals are electrically connected to the resonant tank and the positive power supply terminal of the voltage controlled oscillation unit 20A, corresponding to the circuit connection state between the resonant tank and the power supply terminal of the voltage controlled oscillation unit 20A.

It should be noted that, in the state that the controllable variable capacitance array 50A is electrically connected to the voltage-controlled oscillating unit 20A, two ends of the field effect transistor 5011A, which are connected by a drain and a source, are electrically connected between the resonant circuit of the voltage-controlled oscillating unit 20A and one end of the power supply end, so that the on/off state control of the corresponding field effect transistor 5011A does not affect the parameters of the resonant circuit of the voltage-controlled oscillating unit 20A, and thus the correlation accuracy between the capacitance parameters of the controllable variable capacitance array 50A and the center frequency point of the output frequency of the voltage-controlled oscillating unit 20A is ensured in the state of ensuring the working stability of the voltage-controlled oscillating unit 20A, and the center frequency point of the microwave detector can be accurately set according to the configuration of different register values.

Further, corresponding to fig. 9B, each of the controllably inserted capacitive units 501A further includes a capacitor 5012A, where the field effect transistor 5011A is electrically connected to one end of the resonant tank or the power supply end of the voltage controlled oscillating unit 20A through the capacitor 5012A, so as to set a capacitance parameter variation amount formed by the controllably inserted capacitive unit 501A based on the on/off state variation of the field effect transistor 5011A based on the parameter setting of the capacitor 5012A, and corresponds to an adjustment range of a center frequency point that is favorable for guaranteeing the output frequency of the voltage controlled oscillating unit 20A based on the parameter setting of the capacitor 5012A.

In particular, corresponding to fig. 9C, based on the circuit structure illustrated in fig. 9B, each of the controllably inserted capacitive units 501A further includes an inductor 5013A connected in series with the capacitor 5012A, so as to reduce the influence of the capacitance characteristic of the field effect transistor 5011A on the capacitance parameter of the corresponding controllably inserted capacitive unit 501A based on the setting of the inductor 5013A, thereby ensuring the degree of correlation between the capacitance parameter of the controllably inserted capacitive unit 501A and the parameter of the capacitor 5012A, and further being beneficial to precisely setting the capacitance parameter variation amount formed by the controllably inserted capacitive unit 501A based on the on/off state variation of the field effect transistor 5011A based on the parameter setting of the capacitor 5012A, thereby being beneficial to simplifying the circuit parameter design.

Further, the controllable inserted capacitor units 501A of the controllable variable capacitance array 50A are not limited to be the same, and in different circuit structures of the microwave probe according to this embodiment of the present invention based on the above circuit principle, the controllable inserted capacitor units 501A having different circuit structures can be combined with each other to form the controllable variable capacitance array 50A, which is not limited by the present invention.

In particular, in the schematic circuit diagram of the microwave probe according to this embodiment of the present invention and the schematic circuit diagram of the different circuit structures based on the schematic circuit diagram, a circuit structure of the voltage-controlled oscillation unit 20A is also illustrated, wherein the voltage-controlled oscillation unit 20A has two N-channel MOS transistors (corresponding to Q1 and Q2 in the figure), two P-channel MOS transistors (corresponding to Q3 and Q4 in the figure), an oscillation inductor (corresponding to L in the figure) and an oscillation capacitor (corresponding to C in the figure), wherein the sources of the two N-channel MOS transistors are electrically connected, the sources of the two P-channel MOS transistors are electrically connected, the two drains of the two N-channel MOS transistors are electrically connected to the drains of the different P-channel MOS transistors, respectively, so as to form a drain of one of the N-channel MOS transistors is electrically connected to the drain of the P-channel MOS transistors, the source electrode of the P-channel MOS tube is electrically connected with the source electrode of the other P-channel MOS tube, the drain electrode of the other P-channel MOS tube is electrically connected with the drain electrode of the other N-channel MOS tube, and the source electrode of the other N-channel MOS tube is electrically connected with the source electrode of the former N-channel MOS tube in a sequential connection relationship, wherein the grid electrode of any N-channel MOS tube is electrically connected with the drain electrode of the other N-channel MOS tube, the grid electrode of any P-channel MOS tube is electrically connected with the drain electrode of the other P-channel MOS tube, two ends of the oscillating inductor are respectively electrically connected with the drain electrodes of the different P-channel MOS tubes, two ends of the oscillating capacitor are respectively electrically connected with the drain electrodes of the different P-channel MOS tubes and are connected with the oscillating inductor in parallel, the oscillation capacitors and the oscillation inductors connected in parallel form a resonant circuit of the voltage-controlled oscillation unit 20A, wherein each controllable insertion capacitor unit 501A is electrically connected between the resonant circuit of the voltage-controlled oscillation unit 20A and one end of a power supply end, so that the on-off state control of the corresponding controllable insertion capacitor unit 501A does not affect the resonant circuit parameters of the voltage-controlled oscillation unit 20A, and further, in a state that the resonant circuit of the voltage-controlled oscillation unit 20A is not directly involved, the center frequency point of the output frequency of the voltage-controlled oscillation unit 20A is related to the capacitance parameters of the controllable variable capacitance array 50A, thereby being beneficial to guaranteeing the association accuracy of the capacitance parameters of the controllable variable capacitance array 50A and the center frequency point of the output frequency of the voltage-controlled oscillation unit 20A in a state that the working stability of the voltage-controlled oscillation unit 20A is guaranteed, and further, the center frequency point of the microwave detector can be accurately set according to the configuration of different register values.

It should be noted that, in the schematic circuit diagram of the microwave probe according to this embodiment of the present invention and the schematic circuit diagram of the different circuit structures based on the above circuit principle, the circuit structure of the voltage-controlled oscillation unit 20A is merely used as an example and not limiting the present invention, the circuit structure of the voltage-controlled oscillation unit 20A is various, and the different circuit structures may have the same or different resonant circuits, which is not limited by the present invention.

In particular, in the embodiments of the present invention, the frequency of the electromagnetic wave emitted by the microwave probe is maintained in a dynamic circulation state according to the fixed frequency conversion rule, even if the dynamic circulation frequency has the same frequency as the working frequency of other radio communication devices, the amplitude fluctuation corresponding to the same frequency interference in the doppler intermediate frequency signal can be easily identified and/or filtered according to the existing signal processing mode based on the narrow pulse form of the fixed frequency conversion rule, so that the accuracy of the response of the doppler intermediate frequency signal to the motion of the object in the detection area is advantageously ensured, the anti-radiation interference capability of the microwave probe is correspondingly improved, and the same frequency interference time of the electromagnetic wave emitted by the microwave probe to the corresponding radio communication device cannot generate an intuitive influence on the user of the related application based on the fixed frequency conversion rule within the tolerance mechanism allowable range of the radio communication device, so that the user experience of the related application is advantageously ensured.

In addition, in a state in which the frequency of the electromagnetic wave emitted by the microwave probe is maintained in a dynamic circulation with the fixed frequency conversion rule, the influence of the change in the frequency of the electromagnetic wave emitted by the microwave probe on the amplitude fluctuation of the doppler intermediate frequency signal is fixed, that is, the fixed change rule is not changed or the fixed change rule is presented without affecting the identification of the amplitude fluctuation corresponding to the movement of the object in the detection region in the doppler intermediate frequency signal, so that the accuracy and the instantaneity of the feedback of the doppler intermediate frequency signal on the movement of the object in the detection region can be maintained. For example, in a state in which the frequency of the electromagnetic wave emitted from the microwave probe corresponds to fig. 5 being dynamically cyclically adjusted in a linear frequency conversion rule, the influence of the variation of the frequency of the electromagnetic wave emitted from the microwave probe on the amplitude or frequency of the doppler intermediate frequency signal is fixed without generating additional noise problems; in the state in which the frequency of the electromagnetic wave emitted from the microwave probe corresponds to the state in which the frequency is dynamically and cyclically adjusted in the step-type frequency conversion rule of fig. 4, although a certain noise interference is generated in the switching process of the frequency, the noise interference appears as an interference in which the doppler intermediate frequency signal has a fixed variation rule in amplitude or frequency, and thus can be easily eliminated based on the corresponding noise elimination means or shielding means.

Specifically, the fixed frequency conversion rule is described according to the time-dependent change line type of the center frequency point of the microwave detector, the fixed frequency conversion rule meets the requirements that the continuous duration of the center frequency point of the microwave detector within any 2MHz frequency bandwidth range is not more than 1s, and the cumulative duration of the continuous duration range of any 5s within any 5MHz frequency bandwidth range is not more than 1s, so that when the dynamic circulation frequency has the same frequency as the working frequency of other radio communication equipment, amplitude fluctuation corresponding to the same frequency interference in the Doppler intermediate frequency signal is in a narrow pulse form based on the fixed frequency conversion rule, and the same frequency interference time of the electromagnetic wave emitted by the microwave detector on the corresponding radio communication equipment is within the fault tolerance mechanism allowable range of the radio communication equipment and cannot intuitively influence users of related applications.

Illustratively, the microwave probe corresponds to the fixed frequency conversion rule of the step type illustrated in fig. 4, the microwave probe is shown as f ₀ Work T for center frequency point ₀ After a period of time, frequency-changing to f ₁ Continue to work for the central frequency point and at f ₁ Work T for center frequency point ₁ After a period of time, frequency-changing to f ₂ Continue to operate for the center frequency point and at f ₂ Work T for center frequency point ₂ After a period of time, frequency-changing to f ₃ For the center frequency point to continue to work, … …, and so on and cyclically repeating to realize dynamic cyclic adjustment of the center frequency point of the microwave detector, wherein for the batched microwave detectors, the initial center frequency point of the microwave detector is not limited to be the same, and preferably the random frequency point f is used according to the fixed frequency conversion rule _x Work T for initial center frequency point _x After a period of time, frequency-changing to f _x+1 Continue to work for the central frequency point and at f _x+1 Work T for center frequency point _x+1 After a period of time, frequency-changing to f _x+2 Continue to operate for the center frequency point and at f _x+2 Work T for center frequency point _x+2 After a period of time, frequency-changing to f _x+3 And continuing to work for the central frequency point, repeating the steps of … … and so on circularly to realize dynamic circular adjustment of the central frequency point of the microwave detector. It should be noted that, in the description of the fixed frequency conversion rule corresponding to the step type illustrated in fig. 4, the duration of the period T corresponding to each center frequency point f is not limited to be the same, and the division of the number of center frequency points f and the specific frequency value of each center frequency point f do not constitute a limitation of the present invention, the method of determining the frequency value of each center frequency point f is not limited to the sameThe fixed frequency conversion rule only needs to meet the condition that the continuous duration of the central frequency point of the microwave detector within any 2MHz frequency bandwidth range is not more than 1s, and the accumulated duration of the continuous duration within any 5MHz frequency bandwidth range is not more than 1s, so that when the dynamic circulation frequency exists at the same frequency as the working frequency of other radio communication equipment, the amplitude fluctuation corresponding to the same-frequency interference in the Doppler intermediate frequency signal is in a narrow pulse form based on the fixed frequency conversion rule, and the same-frequency interference time of electromagnetic waves emitted by the microwave detector to the corresponding radio communication equipment is within the fault tolerance mechanism allowable range of the radio communication equipment and cannot intuitively influence the users of related applications.

In order to further understand the invention, the invention also provides a method for resisting radiation interference of the microwave detector, which comprises the following steps:

A. dynamically and circularly adjusting the central frequency point of the microwave detector according to a fixed frequency conversion rule;

C. generating Doppler intermediate frequency signals corresponding to frequency/phase differences between microwave beams emitted by the microwave detector and received echoes in a mixing detection mode;

in the step A, the fixed frequency conversion rule satisfies that the continuous duration of the central frequency point of the microwave detector within any 2MHz frequency bandwidth range is not more than 1s, and the accumulated duration of the continuous duration within any 5s within any 5MHz frequency bandwidth range is not more than 1s.

Illustratively, in some embodiments of the present invention, wherein in step a, the center frequency point of the microwave probe is dynamically cyclically adjusted with the fixed frequency conversion rule to be stepwise changed over time in one cycle period, for example, to be stepwise changed in one direction (corresponding to the one shown in fig. 4) which is gradually increased over time, or to be stepwise changed in one direction which is gradually decreased over time, or to be stepwise changed in multiple directions over time; in other embodiments of the present invention, in step a, the center frequency of the microwave probe is dynamically cyclically adjusted according to the fixed frequency conversion rule to linearly change with time in a cyclic period, for example, to change in a unidirectional linear manner that increases with time, or to change in a unidirectional linear manner that decreases with time, or to change in a multidirectional linear manner with time (corresponding to fig. 5).

It will be appreciated that in the above description of the present invention, the time-varying manner of the center frequency point of the microwave probe is described in terms of the time-varying line type of the center frequency point in one cycle period, and the step change of the center frequency point means that the time-varying line type of the center frequency point in one cycle period is discontinuous in the frequency domain and is broken into a plurality of time domain segments, and the line type of each time domain segment is unchanged in the frequency domain (for example, the changing manner illustrated in fig. 4); the linear change of the center frequency point means that the change line type of the center frequency point along with time in one cycle period is continuous in the frequency domain, including but not limited to a straight line type, a curve line type, a broken line type (such as the change mode illustrated in fig. 5) and a combination line type of the straight line and the curve; the stepwise linear change of the center frequency point means that the line shape of the change of the center frequency point with time in one cycle period is discontinuous in the frequency domain and broken by a plurality of time domain segments, and the line shape of at least one time domain segment is changed in the frequency domain (for example, the changing manner illustrated in fig. 6).

It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are by way of example only and are not limiting. The objects of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been shown and described in the examples and embodiments of the invention may be modified or practiced without departing from the principles described.

Claims

1. Microwave detector with fixed frequency conversion rule, its characterized in that includes:

an antenna unit;

a mixing detection unit, wherein the mixing detection unit is electrically connected to the voltage-controlled oscillation unit and the antenna unit, so as to output Doppler intermediate frequency signals corresponding to the frequency/phase difference between the microwave beam and the reflected echo in a mixing detection manner;

2. The microwave probe of claim 1, wherein a center frequency point of the microwave probe is dynamically cyclically adjusted with the fixed frequency conversion rule to have a cyclic period, the center frequency point of the microwave probe being stepped over time within the cyclic period.

3. The microwave probe of claim 1, wherein a center frequency point of the microwave probe is dynamically cyclically adjusted with the fixed frequency conversion rule to have a cyclic period, the center frequency point of the microwave probe varying linearly with time within the cyclic period.

4. The microwave probe of claim 1, wherein a center frequency point of the microwave probe is dynamically cyclically adjusted with the fixed frequency conversion rule to have a cyclic period, the center frequency point of the microwave probe changing linearly stepwise over time within the cyclic period.

5. The microwave detector according to any one of claims 1 to 4, wherein the MCU is electrically connected to the voltage controlled oscillation unit, a center frequency point of an output frequency of the voltage controlled oscillation unit is associated with an output voltage of the MCU to the voltage controlled oscillation unit, a center frequency point of the corresponding microwave detector is associated with an output voltage of the MCU to the voltage controlled oscillation unit, wherein the output voltage of the MCU to the voltage controlled oscillation unit is set with a fixed transformation rule, such that the center frequency point of the microwave detector can be dynamically cyclically adjusted with the fixed transformation rule corresponding to the fixed transformation rule.

6. The microwave probe of any one of claims 1 to 4, wherein the microwave probe further comprises a controllable variable capacitance array and a digital logic unit having a register, wherein the controllable variable capacitance array is electrically connected to the voltage controlled oscillating unit such that a center frequency point of an output frequency of the voltage controlled oscillating unit is associated with a capacitance parameter of the controllable variable capacitance array, wherein the digital logic unit is arranged to control the capacitance parameter of the controllable variable capacitance array based on a register value of its register such that a center frequency point of the output frequency of the voltage controlled oscillating unit can be set based on a corresponding register value of the register such that the center frequency point of the microwave probe can be adjusted in accordance with a configuration of the corresponding register value of the register, wherein the MCU is electrically connected to the digital logic unit, and is arranged to cyclically configure the register value of the register of the digital logic unit with a fixed assignment rule, corresponding to enable the center frequency point of the microwave probe to be adjusted with the fixed assignment rule corresponding to the fixed assignment rule.

7. The microwave probe of claim 6, wherein the voltage-controlled oscillation unit has two N-channel MOS transistors, two P-channel MOS transistors, an oscillation inductance and an oscillation capacitance, wherein sources of the two N-channel MOS transistors are electrically connected, sources of the two P-channel MOS transistors are electrically connected, two drains of the two N-channel MOS transistors are respectively electrically connected to drains of the different P-channel MOS transistors, so as to form a sequential connection relationship in which a drain of one of the N-channel MOS transistors is electrically connected to a source of the other P-channel MOS transistor, a drain of the other P-channel MOS transistor is electrically connected to a drain of the other N-channel MOS transistor, and a source of the other N-channel MOS transistor is electrically connected to a source of the previous N-channel MOS transistor, wherein gates of the two N-channel MOS transistors are electrically connected to drains of the other N-channel MOS transistor, and the two P-channel MOS transistors are electrically connected to each other in parallel to the oscillation inductance and the two ends of the oscillation capacitance, respectively.

8. The microwave probe of claim 7, wherein the controllably variable capacitive array comprises a plurality of controllably inserted capacitive units, wherein each of the controllably inserted capacitive units is configured to be capable of being switch controlled in a capacitive load configuration, wherein in a state in which the controllably variable capacitive array is electrically connected to the voltage controlled oscillating unit, each of the controllably inserted capacitive units is electrically connected between a resonant tank and one end of a power supply terminal of the voltage controlled oscillating unit, such that a center frequency point of an output frequency of the voltage controlled oscillating unit is associated with a capacitance parameter of the controllably variable capacitive array, and allows a capacitance parameter of the controllably variable capacitive array to be varied based on a change in a switching state of a corresponding one of the controllably inserted capacitive units, wherein the digital logic unit is configured to control the capacitance parameter of the controllably variable capacitive array by controlling the switching state of the corresponding one of the controllably inserted capacitive units based on a register value of its register.

9. The microwave probe of claim 8, wherein each of the controllably inserted capacitive units has a field effect transistor, wherein in a state in which the controllably inserted capacitive array is electrically connected to the voltage controlled oscillating unit, both ends of the field effect transistor, which are connected with a drain and a source, are electrically connected between a resonant tank of the voltage controlled oscillating unit and one end of a power supply terminal, so as to form a capacitance parameter variation of the controllably inserted capacitive array based on an on/off state variation of the corresponding field effect transistor, wherein the digital logic unit is configured to control a capacitance parameter of the controllably inserted capacitive array based on an on/off state of the field effect transistor of the corresponding controllably inserted capacitive unit based on a register value of the register.

10. The microwave probe of claim 9, wherein each of the controllably inserted capacitive units further comprises a capacitor, wherein the field effect transistor is electrically connected to one end of a resonant tank or a power supply terminal of the voltage controlled oscillation unit via the capacitor, so as to set a capacitance parameter variation amount of the controllably inserted capacitive unit based on/off state variation of the field effect transistor based on parameter setting of the capacitor.

11. The microwave probe of claim 10, wherein each of the controllably inserted capacitive elements further comprises an inductance in series with the capacitance to reduce an effect of a capacitance characteristic of the field effect transistor on a capacitance parameter of the corresponding controllably inserted capacitive element based on a setting of the inductance.

12. The anti-radiation interference method of the microwave detector is characterized by comprising the following steps of:

13. The method of claim 12, wherein in step a, the center frequency point of the microwave probe is dynamically and cyclically adjusted to have a cyclic period with the fixed frequency conversion rule, and the center frequency point of the microwave probe is stepwise changed with time in the cyclic period.

14. The method of claim 12, wherein in step a, the center frequency point of the microwave probe is dynamically cyclically adjusted with the fixed frequency conversion rule to have a cyclic period, and the center frequency point of the microwave probe varies linearly with time within the cyclic period.

15. The method of claim 12, wherein in step a, the center frequency point of the microwave probe is dynamically and cyclically adjusted to have a cyclic period according to the fixed frequency conversion rule, and the center frequency point of the microwave probe is linearly changed stepwise over time in the cyclic period.