Self-excitation self-adaptive microwave detector and self-adaptive method thereof
阅读说明：本技术 自激自适应式微波探测器及其自适应方法 (Self-excitation self-adaptive microwave detector and self-adaptive method thereof ) 是由 邹高迪 邹新 于 2019-10-25 设计创作，主要内容包括：本发明提供了一自激自适应式微波探测器及其自适应方法,其中所述自激自适应式微波探测器包括一放大模块和电连接于所述放大模块的一控制单元,其中所述自激自适应式微波探测器基于微波多普勒效应原理输出一多普勒信号,其中基于所述多普信号在一自适应时间段内的波动,通过减小所述放大模块的放大倍数或增益、提高所述控制单元所设定的动作阀值以及减弱处理所述多普勒信号的方式,自适应缩小所述自激自适应式微波探测器的有效探测距离,从而以自适应调整所述自激自适应式微波探测器的有效探测距离的方式排除自激干扰。(The invention provides a self-excitation self-adaptive microwave detector and a self-adaptive method thereof, wherein the self-excitation self-adaptive microwave detector comprises an amplifying module and a control unit electrically connected with the amplifying module, wherein the self-excitation self-adaptive microwave detector outputs a Doppler signal based on the microwave Doppler effect principle, and the effective detection distance of the self-excitation self-adaptive microwave detector is reduced in a self-adaptive time period in a self-adaptive manner by reducing the amplification factor or gain of the amplifying module, increasing the action threshold value set by the control unit and weakening the Doppler signal based on the fluctuation of the Doppler signal, so that the self-excitation interference is eliminated in a manner of adaptively adjusting the effective detection distance of the self-excitation self-adaptive microwave detector.)
1. An adaptive method for a self-excited adaptive microwave detector, comprising the steps of:
(A) outputting a Doppler signal based on the microwave Doppler effect principle; and
(B) starting the timing of an adaptive time period in the environment state without the target moving object and adaptively adjusting the effective detection distance of the self-excitation adaptive microwave detector based on the fluctuation of the Doppler signal in the adaptive time period to eliminate self-excitation interference.
2. The method according to claim 1, wherein in the step (B), when there is fluctuation in the doppler signal, the sensitivity of the self-excited adaptive microwave detector is adaptively decreased, thereby adaptively decreasing the effective detection distance of the self-excited adaptive microwave detector in a manner of adaptively decreasing the sensitivity of the self-excited adaptive microwave detector.
3. The method according to claim 2, wherein in the step (B), when there is fluctuation in the doppler signal, the amplification factor or gain of an amplification module of the self-excited adaptive microwave detector is adaptively decreased, thereby adaptively decreasing the sensitivity of the self-excited adaptive microwave detector.
4. The method of claim 3, wherein in step (B), the reduction of the amplification and gain of the amplification block is controlled by an ALC control circuit or an AGC control circuit.
5. The method according to claim 2, wherein in the step (B), when there is fluctuation in the doppler signal, the output of the doppler signal is attenuation-processed to adaptively reduce the effective detection distance of the self-excited adaptive microwave detector in a manner of adaptively reducing the sensitivity of the self-excited adaptive microwave detector.
6. The method according to claim 5, wherein in the step (B), a control unit outputs a level control signal and attenuates the Doppler signal by adjusting an attenuation circuit, so that the Doppler signal is attenuated to a stable output.
7. The method according to claim 1, wherein in the step (B), when there is fluctuation in the doppler signal, the action threshold set by a control unit of the self-excited adaptive microwave detector is adaptively increased, so as to adaptively adjust the degree of response of the self-excited adaptive microwave detector to the doppler signal to change the effective detection distance.
8. The method according to any one of claims 1 to 7, further comprising a step of: (C) when the Doppler signals have regular fluctuation, the fluctuation in the Doppler signals is filtered out in a software filtering mode.
9. The method according to any one of claims 1 to 7, further comprising a step of: (C) when the fluctuation frequency of the Doppler signal is fixed, the Doppler signal corresponding to the fixed frequency is filtered in a hardware filter circuit, a notch circuit or a software processing mode.
10. The method according to any one of claims 1 to 7, further comprising a step of: (C) and when the Doppler signal has irregular fluctuation, outputting a background signal according to the fluctuation of the Doppler signal, and outputting a trigger signal according to the difference between the fluctuation of the Doppler signal and the background signal in a working time period, wherein the trigger signal is the feedback of the moving object.
11. The method according to any one of claims 1 to 7, further comprising a step of: (C) starting the timing of an operation time period, and when the instantaneous fluctuation of the Doppler signals is increased, adaptively reducing the amplification factor of the Doppler signals at corresponding moments so as to eliminate transient interference.
12. The method of any one of claims 1 to 7, wherein the step (A) further comprises the steps of:
(A1) emitting a probe beam; and
(A2) receiving a reflected wave formed by the probe beam being reflected, and outputting the Doppler signal based on a difference in characteristic parameters between the reflected wave and the probe beam.
13. A self-exciting adaptive microwave probe, comprising:
an oscillator, wherein the oscillator is configured to output an excitation signal;
an antenna loop electrically connected to the oscillator, the antenna loop being excited by the excitation signal to emit at least one probe beam having a frequency same as that of the excitation signal, and being capable of receiving a reflected wave formed by reflecting the probe beam;
a mixing detection module, wherein the mixing detection module is electrically connected to the oscillator and the antenna loop, respectively, so as to be able to receive the excitation signal and a reflected wave signal generated according to the reflected wave, and to output a doppler signal according to a difference in characteristic parameters between the excitation signal and the reflected wave signal;
a signal processing unit, wherein the signal processing unit is configured to adaptively adjust an effective detection distance of the self-excited adaptive microwave detector according to the fluctuation of the Doppler signal within an adaptive time period to eliminate self-excited interference.
14. A self-excited adaptive microwave detector as claimed in claim 13, wherein the signal processing unit comprises an amplifying module electrically connected to the mixer detection module, and a control circuit electrically connected to the amplifying module, wherein the control circuit is configured to adaptively decrease the amplification factor or gain of the amplifying module, wherein when there is fluctuation in the doppler signal output from the mixer detection module during the adaptive period, the control circuit adaptively decreases the amplification factor or gain of the amplifying module to adaptively decrease the sensitivity of the self-excited adaptive microwave detector, thereby adaptively adjusting the effective detection distance of the self-excited adaptive microwave detector.
15. A self-excited adaptive microwave detector as claimed in claim 14, wherein the control circuit is configured as an ALC control circuit or an AGC control circuit.
16. The self-excited adaptive microwave detector as claimed in claim 13, wherein the signal processing unit comprises an amplifying module electrically connected to the mixing detection module and a control unit electrically connected to the amplifying module, wherein the control unit is preset with an action threshold, wherein when there is fluctuation in the doppler signal output from the mixing detection module during the adaptive time period, the control unit adaptively increases the action threshold according to the fluctuation of the doppler signal to adaptively adjust the degree of response of the self-excited adaptive microwave detector to the doppler signal to change the effective detection distance.
17. The self-excited adaptive microwave detector according to claim 13, wherein the signal processing unit comprises an amplifying module electrically connected to the mixer detection module and a control unit electrically connected to the amplifying module, wherein when there is fluctuation in the doppler signal output from the mixer detection module during the adaptive period, the control unit performs a reduction process on the doppler signal, thereby adaptively reducing the effective detection distance of the self-excited adaptive microwave detector.
18. A self-excited adaptive microwave detector as claimed in claim 17, wherein the control unit is provided with an intermediate frequency output attenuation circuit, wherein the intermediate frequency output attenuation circuit is configured to attenuate the doppler signal when there is fluctuation in the doppler signal output based on the mix detection module during the adaptive period.
19. A self-excited adaptive microwave detector as claimed in any one of claims 13 to 18, further provided with a filtering module, wherein the filtering module is used for filtering the doppler signals outputted by the mixing detection module with regular or fixed frequency in an operation time period.
20. A self-excited adaptive microwave detector as claimed in claim 19, wherein the filtering module may be provided as one of software filtering, hardware filtering circuitry or notch circuitry.
Technical Field
The invention relates to the field of microwave detection, in particular to a self-excitation self-adaptive microwave detector and a self-adaptive method thereof.
Background
Microwave detector works based on microwave doppler effect principle, the electromagnetic wave that microwave detector self launched has certain dissipation distance and scope, and in narrow and small space, the electromagnetic wave can't be normally dissipated the decay, and then will produce the phenomenon of multiple reflection, and the echo homoenergetic that the reflection formed at every turn can be received by microwave detector, then can correspond the output microwave detector's interfering signal, that is to say, the multiple reflection of electromagnetic wave in narrow and small space can influence microwave detector's normal work, can be right promptly microwave detector produces the self excitation interference.
Specifically, because there is the reflection phenomenon in narrow and small space the electromagnetic wave that microwave detector transmitted, the electromagnetic wave can make the electromagnetic wave density increase in this narrow and small space after the multiple reflection in narrow and small space, and the electromagnetic wave multiple reflection and the back wave homoenergetic that forms are received microwave detector, consequently can be right microwave detector's work production is disturbed, in other words, under the interference effect who gets rid of external signal, the electromagnetic wave that microwave detector self transmitted is in narrow and small space multiple reflection and the change that produces frequency and/or phase place, thereby quilt microwave detector receives and forms right microwave detector's interference signal makes microwave detector can not normally work, and this is exactly microwave detector's self-excitation interference phenomenon.
In order to eliminate the self-excited interference of the microwave detector, the adjustment of the microwave actual coverage range of the microwave detector can be formed in a manner of adjusting the power of the microwave detector according to the detection range required to eliminate the self-excited interference, but for the microwave detectors in mass production, the microwave detector usually has a fixed structure and power, if the structure or the power of the microwave detector needs to be changed, the modification usually has higher professional requirements for technicians, on one hand, the modification process is more complex, and on the other hand, the high labor cost is also caused. Moreover, the applied scenes of such microwave detectors are diverse, and when the microwave detectors are applied to different application scenes, different use effects may be correspondingly generated, so that it is difficult to perform different production configurations on the microwave detectors for a certain or a certain specific environment.
Disclosure of Invention
An object of the present invention is to provide a self-excited adaptive microwave detector and an adaptive method thereof, wherein the self-excited adaptive microwave detector outputs a doppler signal based on the microwave doppler effect principle, wherein an effective detection distance of the self-excited adaptive microwave detector is adaptively adjusted based on a fluctuation of the doppler signal, thereby excluding self-excited interference in a manner of adaptively adjusting the effective detection distance of the self-excited adaptive microwave detector.
It is another object of the present invention to provide a self-excited adaptive microwave detector and an adaptive method thereof, in which the effective detection distance of the self-excited adaptive microwave detector is reduced by decreasing the sensitivity of the self-excited adaptive microwave detector, thereby excluding self-excited interference in a manner of adaptively adjusting the effective detection distance of the self-excited adaptive microwave detector.
It is another object of the present invention to provide a self-excited adaptive microwave detector and an adaptive method thereof, in which the sensitivity of the self-excited adaptive microwave detector is adaptively lowered by adaptively reducing the amplification factor or gain of an amplification block of the self-excited adaptive microwave detector based on the fluctuation of the doppler signal within an adaptive time period, and the effective detection distance of the self-excited adaptive microwave detector is reduced, thereby excluding self-excited interference in a manner of adaptively adjusting the effective detection distance of the self-excited adaptive microwave detector.
It is another object of the present invention to provide a self-excited adaptive microwave detector and an adaptive method thereof, wherein the sensitivity of the self-excited adaptive microwave detector is adaptively lowered by weakening the processing of the doppler signal based on the fluctuation of the doppler signal within an adaptive time period, thereby reducing the effective detection distance of the self-excited adaptive microwave detector, and further eliminating self-excited interference in a manner of adaptively adjusting the effective detection distance of the self-excited adaptive microwave detector.
Another object of the present invention is to provide a self-excited adaptive microwave probe and an adaptive method thereof, wherein a level control signal is outputted by a control unit based on the fluctuation of the doppler signal in the adaptive time period to perform attenuation processing on the doppler signal in a manner of adjusting an attenuation circuit, so that the doppler signal is attenuated to a stable output.
It is another object of the present invention to provide a self-excited adaptive microwave detector and an adaptive method thereof, in which the effective detection distance of the self-excited adaptive microwave detector is adaptively reduced by adaptively increasing an operation threshold of a control unit of the self-excited adaptive microwave detector based on a fluctuation of the doppler signal within an adaptive time period, thereby excluding self-excited interference in a manner of adaptively adjusting the effective detection distance of the self-excited adaptive microwave detector.
Another object of the present invention is to provide a self-excited adaptive microwave detector and an adaptive method thereof, wherein when there is regular fluctuation in the doppler signal, the doppler signal is filtered by means of software filtering process.
It is another object of the present invention to provide a self-excited adaptive microwave detector and an adaptive method thereof, wherein when the frequency of the fluctuation of the doppler signal is fixed, the doppler signal having the fixed frequency is filtered by means of a hardware filter circuit, a notch circuit or a software process.
Another objective of the present invention is to provide a self-excited adaptive microwave detector and an adaptive method thereof, wherein when there is irregular fluctuation in the doppler signal, a background signal is output according to the fluctuation of the doppler signal, and a trigger signal is output according to the difference between the fluctuation of the doppler signal and the background signal in a working time period, so that the trigger signal is the feedback of a moving object.
It is another object of the present invention to provide a self-excited adaptive microwave detector and an adaptive method thereof, wherein the amplification factor of the doppler signal is adaptively reduced at corresponding instants when the temporal fluctuation of the doppler signal increases during an operation period, which is advantageous for eliminating transient interference.
It is another object of the present invention to provide a self-excited adaptive microwave detector and an adaptive method thereof, wherein the self-excited adaptive microwave detector outputs the doppler signal by emitting a probe beam and receiving a reflected wave formed by the probe beam being reflected and based on a difference in characteristic parameters between the reflected wave and the probe beam.
It is another object of the present invention to provide a self-excited adaptive microwave probe and an adaptive method thereof, wherein the doppler signal is a frequency difference signal outputted according to a frequency difference between the probe beam and the reflected wave.
It is another object of the present invention to provide a self-excited adaptive microwave detector and an adaptive method thereof, wherein the doppler signal is a phase difference signal outputted according to a phase difference between the probe beam and the reflected wave.
The invention also aims to provide a self-excitation self-adaptive microwave detector and a self-adaptive method thereof, wherein the method is simple, convenient and easy to implement, and can meet the requirements of practical application of the self-excitation self-adaptive microwave detector.
In order to achieve at least one of the above objects, the present invention provides an adaptive method for a self-excited adaptive microwave detector, comprising the steps of:
(A) outputting a Doppler signal based on the microwave Doppler effect principle; and
(B) starting the timing of an adaptive time period in the environment state without the target moving object and adaptively adjusting the effective detection distance of the self-excitation adaptive microwave detector based on the fluctuation of the Doppler signal in the adaptive time period to eliminate self-excitation interference.
In one embodiment of the present invention, in the step (B), when there is a fluctuation in the doppler signal, the sensitivity of the self-excited adaptive microwave detector is adaptively decreased, so as to adaptively decrease the effective detection distance of the self-excited adaptive microwave detector in a manner of adaptively decreasing the sensitivity of the self-excited adaptive microwave detector.
In one embodiment of the present invention, in the step (B), when there is fluctuation in the doppler signal, the amplification factor or gain of an amplification module of the self-excited adaptive microwave detector is adaptively reduced, so as to adaptively reduce the sensitivity of the self-excited adaptive microwave detector.
In one embodiment of the present invention, in the step (B), the amplification factor and the gain of the amplifying module are reduced under the control of an ALC control circuit or an AGC control circuit.
In one embodiment of the present invention, wherein in the step (B), when there is fluctuation in the doppler signal, the output of the doppler signal is attenuation-processed, so as to adaptively reduce the effective detection distance of the self-excited adaptive microwave detector in a manner of adaptively reducing the sensitivity of the self-excited adaptive microwave detector.
In an embodiment of the present invention, in the step (B), a control unit outputs a level control signal and attenuates the doppler signal by adjusting an attenuation circuit, so that the doppler signal is attenuated to a stable output.
In one embodiment of the present invention, in the step (B), when there is fluctuation in the doppler signal, the action threshold set by a control unit of the self-excited adaptive microwave detector is adaptively increased, so as to adaptively adjust the degree of response of the self-excited adaptive microwave detector to the doppler signal to change the effective detection distance.
In an embodiment of the present invention, the adaptive method of the self-excited adaptive microwave detector further comprises a step of: (C) when the Doppler signals have regular fluctuation, the fluctuation in the Doppler signals is filtered out in a software filtering mode.
In an embodiment of the present invention, the adaptive method of the self-excited adaptive microwave detector further comprises a step of: (C) when the fluctuation frequency of the Doppler signal is fixed, the Doppler signal corresponding to the fixed frequency is filtered in a hardware filter circuit, a notch circuit or a software processing mode.
In an embodiment of the present invention, the adaptive method of the self-excited adaptive microwave detector further comprises a step of: (C) and when the Doppler signal has irregular fluctuation, outputting a background signal according to the fluctuation of the Doppler signal, and outputting a trigger signal according to the difference between the fluctuation of the Doppler signal and the background signal in a working time period, wherein the trigger signal is the feedback of the moving object.
In an embodiment of the present invention, the adaptive method of the self-excited adaptive microwave detector further comprises a step of: (C) starting the timing of an operation time period, and when the instantaneous fluctuation of the Doppler signals is increased, adaptively reducing the amplification factor of the Doppler signals at corresponding moments so as to eliminate transient interference.
In an embodiment of the present invention, wherein the step (a) further comprises the steps of:
(A1) emitting a probe beam; and
(A2) receiving a reflected wave formed by the probe beam being reflected, and outputting the Doppler signal based on a difference in characteristic parameters between the reflected wave and the probe beam.
The present invention also provides in another aspect a self-excited adaptive microwave detector comprising:
an oscillator, wherein the oscillator is configured to output an excitation signal;
an antenna loop electrically connected to the oscillator, the antenna loop being excited by the excitation signal to emit at least one probe beam having a frequency same as that of the excitation signal, and being capable of receiving a reflected wave formed by reflecting the probe beam;
a mixing detection module, wherein the mixing detection module is electrically connected to the oscillator and the antenna loop, respectively, so as to be able to receive the excitation signal and a reflected wave signal generated according to the reflected wave, and to output a doppler signal according to a difference in characteristic parameters between the excitation signal and the reflected wave signal;
a signal processing unit, wherein the signal processing unit is configured to adaptively adjust an effective detection distance of the self-excited adaptive microwave detector according to the fluctuation of the Doppler signal within an adaptive time period to eliminate self-excited interference.
In an embodiment of the present invention, the signal processing unit includes an amplifying module electrically connected to the mixer detection module, and a control circuit electrically connected to the amplifying module, wherein the control circuit is configured to adaptively decrease the amplification factor or gain of the amplifying module, wherein when there is fluctuation in the doppler signal output from the mixer detection module during the adaptive time period, the control circuit adaptively decreases the amplification factor or gain of the amplifying module to adaptively decrease the sensitivity of the self-excited adaptive microwave detector, thereby adaptively adjusting the effective detection distance of the self-excited adaptive microwave detector.
In one embodiment of the present invention, the control circuit is configured as an ALC control circuit or an AGC control circuit.
In an embodiment of the present invention, the signal processing unit includes an amplifying module electrically connected to the mixed detection module and a control unit electrically connected to the amplifying module, wherein the control unit is preset with an action threshold, and when there is fluctuation in the doppler signal output by the mixed detection module in the adaptive time period, the control unit adaptively increases the action threshold according to the fluctuation of the doppler signal, so as to adaptively adjust a response degree of the self-excited adaptive microwave detector to the doppler signal, and change the effective detection distance.
In an embodiment of the present invention, the signal processing unit includes an amplifying module electrically connected to the mixer detection module and a control unit electrically connected to the amplifying module, wherein when there is fluctuation in the doppler signal output by the mixer detection module during the adaptive time period, the control unit performs attenuation processing on the doppler signal, so as to adaptively adjust the effective detection distance of the self-excited adaptive microwave detector.
In an embodiment of the present invention, the control unit is provided with an intermediate frequency output attenuation circuit, wherein the intermediate frequency output attenuation circuit is configured to attenuate the doppler signal when there is fluctuation in the doppler signal output by the mix detection module in the adaptive time period.
In an embodiment of the present invention, the self-excited adaptive microwave detector is further provided with a filtering module, wherein the filtering module is configured to filter the doppler signals outputted by the mixing detection module, which are regular or have a fixed frequency, during an operation period.
In an embodiment of the invention, the filtering module may be configured as one of a software filtering circuit, a hardware filtering circuit, or a notch circuit.
Further objects and advantages of the invention will be fully apparent from the ensuing description and drawings.
Drawings
Fig. 1 is a flow chart of an adaptive method of the self-excited adaptive microwave detector according to a preferred embodiment of the present invention.
Fig. 2 is a block diagram of a first implementation of the self-excited adaptive microwave detector according to the above preferred embodiment of the present invention.
Fig. 3 is a circuit diagram of a first implementation of the self-excited adaptive microwave detector according to the above preferred embodiment of the present invention.
Fig. 4 is a block diagram of the second implementation of the self-excited adaptive microwave detector according to the above preferred embodiment of the present invention.
Fig. 5 is a block diagram of a third implementation of the self-excited adaptive microwave detector according to the above preferred embodiment of the present invention.
Fig. 6 is a circuit diagram of an intermediate frequency output attenuation circuit of the third implementation of the self-excited adaptive microwave detector according to the above preferred embodiment of the present invention.
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 "vertical," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the 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 device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above terms should not be construed as limiting the present invention.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It can be understood that the actual detection range of the microwave detector is related to the power of the electromagnetic wave emitted by the microwave detector, and the actual detection range formed by the electromagnetic wave emitted by the microwave detector is generally fixed, that is, the reflected wave of the electromagnetic wave in the actual detection range can be received by the microwave detector, and includes the reflected wave formed by the electromagnetic wave reflected by the action of the living body in the actual detection range and the reflected wave formed by the reflection of the electromagnetic wave in the narrow space, that is, no matter the microwave detector receives the reflected wave formed by the action of the living body or the reflected wave formed by the self-excitation phenomenon of the microwave detector, a doppler signal is output, which will make the microwave detector not work normally by the self-excitation interference, therefore, in order to eliminate the self-excitation interference, the invention reduces the sensitivity of the self-excitation adaptive microwave detector by self-adaptation, and the effective detection distance of the self-excitation self-adaptive microwave detector is reduced in a self-adaptive manner, namely the effective data range of the self-excitation self-adaptive microwave detector is reduced in a self-adaptive manner, so that self-excitation interference is eliminated in a manner of adaptively adjusting the effective detection distance of the self-excitation self-adaptive microwave detector.
As shown in fig. 1, the adaptive method of a self-excited adaptive microwave detector of the present invention comprises the following steps:
(A) outputting a Doppler signal based on the microwave Doppler effect principle; and
(B) starting the timing of an adaptive time period in the environment state without the target moving object and adaptively adjusting the effective detection distance of the self-excitation adaptive microwave detector based on the fluctuation of the Doppler signal in the adaptive time period to eliminate self-excitation interference.
It is worth mentioning that, the step (a) further comprises the steps of:
(A1) emitting a probe beam; and
(A2) receiving a reflected wave formed by the probe beam being reflected, and outputting the Doppler signal based on a difference in characteristic parameters between the reflected wave and the probe beam.
It is understood that, in general, the detection beam emitted by the self-excited adaptive microwave detector is based on the speed of light, the range that can be detected by the detection beam forms a detection region, the detection region corresponds to the actual detection range of the self-excited adaptive microwave detector, i.e. the actual detection distance of the self-excited adaptive microwave detector, and the effective detection distance of the self-excited adaptive microwave detector is the effective data range of the self-excited adaptive microwave detector, i.e. the effective data range that can respond to the doppler signal generated by the target moving object. It can be understood that, wherein when the detection area is sufficiently spacious, the detection beam can be dispersed and attenuated in the detection area by itself, and when the detection area is a narrow space, especially when having a glass or metal closed space, the detection beam in there is the phenomenon of multiple reflections in the narrow space, thereby cause the detection beam in the narrow space is reflected and formed the corresponding frequency and/or phase parameter of the reflected wave take place the difference, then based on the detection beam and the corresponding difference of the frequency and/or phase parameter of the reflected wave, the self-excited adaptive microwave detector all can output the doppler signal. Since the adaptive time period starts counting in the environment state without the target moving object, it can be considered that no target moving object exists in the adaptive time period, and when the doppler signal is output based on the principle of the microwave doppler effect and there is fluctuation in the doppler signal, it can be considered that self-excited interference of the self-excited adaptive microwave detector exists in the environment without the target moving object, whereby in order to eliminate the self-excited interference, in the step (B), the self-excited interference is eliminated in such a manner that the effective detection distance of the self-excited adaptive microwave detector is adaptively adjusted based on the fluctuation in the doppler signal.
It should be understood that the doppler signal may be a frequency difference signal output according to a frequency difference between the probe beam and the corresponding reflected wave, or may be a phase difference signal output according to a phase difference between the probe beam and the corresponding reflected wave, which is not limited by the present invention.
It should also be understood that different application scenarios correspond to different target active objects, for example, in an application scenario of indoor detection of human body activity, the target active objects are active human bodies; in the application scenario of detecting vehicle activity on the road, the target moving object is a moving vehicle, and therefore the target moving object is not to be construed as a limitation to the present invention.
Further, as shown in fig. 2 and 3, in the first implementation manner of the above preferred embodiment of the present invention, the present invention reduces the effective detection distance of the self-excited adaptive microwave detector by reducing the sensitivity of the self-excited adaptive microwave detector, specifically, wherein in the step (B), when there is a fluctuation in the doppler signal, the sensitivity of the self-excited adaptive microwave detector is adaptively reduced, thereby adaptively reducing the effective detection distance of the self-excited adaptive microwave detector in a manner of adaptively reducing the sensitivity of the self-excited adaptive microwave detector.
Illustratively, in the step (B), when there is fluctuation in the doppler signal, the amplification factor or gain of an amplification module of the self-excited adaptive microwave detector is adaptively reduced, so as to adaptively reduce the sensitivity of the self-excited adaptive microwave detector.
Specifically, in the step (B), the present invention may control to decrease the amplification factor and the gain of the amplification block based on the fluctuation of the doppler signal by an ALC control circuit or an AGC control circuit, thereby decreasing the sensitivity of the self-excited adaptive microwave detector.
It should be noted that the ALC control circuit is an automatic level control circuit, and the purpose of controlling the level of the amplified doppler signal output by the amplification module is achieved by feedback-controlling the strength of the amplified doppler signal output by the amplification module, so that the sensitivity of the self-excited adaptive microwave detector can be reduced by reducing the gain of the amplification module. The AGC control circuit is an automatic gain control circuit, wherein the AGC control circuit adaptively decreases the gain of the amplification module based on the strength of the doppler signal to decrease the sensitivity of the self-excited adaptive microwave detector.
It is to be understood that, in the step (B), when the amplification factor or gain of the amplification module is adaptively decreased, the amplified doppler signal output by the amplification module is not recognized by the self-excited adaptive microwave detector, that is, the effective detection distance of the self-excited adaptive microwave detector can be decreased by decreasing the sensitivity of the self-excited adaptive microwave detector, that is, the effective data range of the self-excited adaptive microwave detector can be decreased, so that the doppler signal generated by the self-excitation phenomenon of the self-excited adaptive microwave detector is excluded from the effective data range of the self-excited adaptive microwave detector, and the self-excited adaptive microwave detector can operate without self-excitation interference.
It should be noted that, in this embodiment of the present invention, the method further includes a step of: (C) starting the timing of an operation time period, and when the instantaneous fluctuation of the Doppler signals is increased, adaptively reducing the amplification factor of the Doppler signals at corresponding moments so as to eliminate transient interference.
It is to be understood that, when there is fluctuation in the doppler signal during a subsequent operation period after adaptively decreasing the sensitivity of the self-excited adaptive microwave detector during the adaptive period, it may be considered that there is object motion during the operation period, and when the fluctuation of the doppler signal increases at a certain moment, the instantaneously increased doppler signal may be considered as a transient interference signal in the environment, and therefore, in the step (C), the sensitivity of the self-excited adaptive microwave detector may be adaptively decreased by the ALC control circuit or the AGC control circuit based on the instantaneous fluctuation of the doppler signal, so as to decrease the effective detection distance of the self-excited adaptive microwave detector at the corresponding moment, thereby excluding the transient interference signal.
Further, as shown in fig. 4, in the second implementation manner of the above preferred embodiment of the present invention, the present invention reduces the effective detection distance of the self-excited adaptive microwave detector by increasing the operation threshold of the self-excited adaptive microwave detector, specifically, wherein in the step (B), when the doppler signal has fluctuation, the operation threshold set by a control unit of the self-excited adaptive microwave detector is adaptively increased, so as to adaptively adjust the degree of response of the self-excited adaptive microwave detector to the doppler signal and change the effective detection distance.
It is understood that the control unit processes the amplified doppler signal output by the amplifying module according to the action threshold value, that is, the valid data range of the self-excited adaptive microwave detector is defined by the action threshold value, specifically, when the intensity of the amplified doppler signal is smaller than the action threshold value, the amplified doppler signal is excluded from the valid data range of the control unit, that is, the amplified doppler signal can be attributed to the valid data range of the control unit only when the intensity of the amplified doppler signal is larger than the action threshold value, and the adaptive microwave detector operates in response to the doppler signal in the valid data range, that is, when the self-excited adaptive microwave detector outputs the doppler signal in the adaptive time period and there is fluctuation in the doppler signal, the doppler signal can be regarded as a self-excited interference signal in the detection region, so that the effective detection distance of the self-excited adaptive microwave detector can be correspondingly reduced by increasing the action threshold set by the control unit, that is, the effective data range of the self-excited adaptive microwave detector can be correspondingly reduced, and the doppler signal output by self-excited interference can be actively excluded to exclude self-excited interference.
Further, as shown in fig. 5 and 6, in the third implementation of the above preferred embodiment of the present invention, the present invention reduces the effective detection distance of the self-excited adaptive microwave detector by reducing the sensitivity of the self-excited adaptive microwave detector, specifically, wherein in the step (B), when there is a fluctuation in the doppler signal, the output of the doppler signal is attenuation-processed, thereby adaptively reducing the effective detection distance of the self-excited adaptive microwave detector in a manner of adaptively reducing the sensitivity of the self-excited adaptive microwave detector.
It is understood that when the self-excited adaptive microwave detector outputs the doppler signal in the adaptive time period and there is fluctuation in the doppler signal, the doppler signal can be regarded as a self-excited interference signal in the detection region, and therefore in this embodiment of the present invention, the sensitivity of the self-excited adaptive microwave detector is adaptively reduced by weakening the processed doppler signal before the doppler signal is amplified, so as to exclude the self-excited interference in a manner of adaptively reducing the effective detection distance of the self-excited adaptive microwave detector.
Further, in this embodiment of the present invention, in the step (B), a control unit outputs a level control signal and performs attenuation processing on the doppler signal by adjusting an attenuation circuit, so that the doppler signal is attenuated to a stable output.
It is understood that the control unit performs the attenuation processing on the doppler signal through an intermediate frequency output attenuation circuit, as shown in fig. 6, and it is understood that the intermediate frequency output attenuation circuit can reduce the intensity of the doppler signal after performing the attenuation processing on the doppler signal, so that the doppler signal is excluded from the effective data range of the self-excited adaptive microwave detector, thereby excluding the self-excited interference.
It should be noted that, the intermediate frequency output attenuation circuit may attenuate the doppler signal before the amplification module amplifies the doppler signal, or may process the amplified doppler signal after the amplification module amplifies the doppler signal, which is not limited in the present invention.
It should be noted that, in the above preferred embodiment of the present invention, the method further comprises a step of: (C) when the Doppler signal has regular fluctuation, the fluctuation in the Doppler signal can be filtered out in a software filtering processing mode.
It can be understood that, the present invention may filter the doppler signal to eliminate self-excitation interference by means of software filtering processing when the adaptive time period is based on the regular fluctuation of the doppler signal, and may also filter the fluctuation in the doppler signal to eliminate interference of other radio devices or mechanical devices in the detection area by means of software filtering processing when the working time period is based on the regular fluctuation of the doppler signal, which is not limited in this respect.
It is also worth mentioning that in some embodiments of the present invention, the method further comprises a step of: (C) when the fluctuation frequency of the Doppler signal is fixed, the Doppler signal corresponding to the fixed frequency is filtered in a hardware filter circuit, a notch circuit or a software processing mode.
It should be understood that, the present invention may filter the doppler signal having the fixed frequency to eliminate self-excited interference by a hardware filter circuit, a notch circuit or a software processing mode when the frequency of the fluctuation of the doppler signal is fixed in the adaptive time period, and may also filter the doppler signal having the corresponding fixed frequency to eliminate interference of other radio devices or mechanical devices in the detection area by a hardware filter circuit, a notch circuit or a software processing mode when the frequency of the fluctuation of the doppler signal is fixed in the operating time period, which is not limited in this respect.
It should be noted that, in some embodiments of the present invention, the method further includes a step of: (C) when the Doppler signal has irregular fluctuation, outputting a background signal according to the fluctuation of the Doppler signal, and outputting a trigger signal according to the difference between the fluctuation of the Doppler signal and the background signal in a working time period, wherein the trigger signal is feedback of the existence of object movement.
It is to be understood that, when there is irregular fluctuation in the doppler signal in the adaptive time period, the doppler signal may be regarded as an interference signal in the detection area, and then a background signal may be output according to the interference signal, so that in the operation time period, when there is a difference between the output doppler signal and the background signal, the doppler signal may be regarded as corresponding to the presence of object motion in the detection area, and therefore the true trigger signal may be output based on the difference between the doppler signal and the background signal, and then the trigger signal is a feedback of the presence of object motion. In other words, when the doppler signal output during the operation period is the same as the background signal, the doppler signal can be regarded as the interference signal in the detection region.
As shown in fig. 2 to 6, the present invention further provides a self-excited adaptive microwave detector, wherein the self-excited adaptive microwave detector comprises an oscillator 10, an antenna loop 20, a mixing detection module 30 and a
It can be understood that, regardless of whether the reflected wave is formed by reflecting the probe beam by the object motion or by reflecting the probe beam in a narrow space, the reflected wave can be received by the antenna loop 20, and regardless of whether the reflected wave is formed by reflecting the probe beam by the object motion or by reflecting the probe beam in a narrow space, the characteristic parameter of the reflected wave and the probe beam are different, so that the frequency mixing detection module 30 outputs the doppler signal according to the difference of the characteristic parameter between the reflected wave and the probe beam, so as to adaptively reduce the effective detection distance of the self-adaptive microwave detector, that is, adaptively reduce the effective data range of the self-adaptive microwave detector by the
It should be noted that the doppler signal of the present invention may be a frequency difference signal output based on a frequency difference between the probe beam and the corresponding reflected wave, or may be a phase difference signal output based on a phase difference between the probe beam and the corresponding reflected wave, which is not limited in the present invention.
Further, as shown in fig. 2 and 3, a first embodiment of the self-excited adaptive microwave detector is illustrated, in the first embodiment, the
It should be noted that, in the first embodiment of the present invention, the control circuit 43 may be configured as an ALC control circuit or an AGC control circuit, which is not limited by the present invention.
It is understood that the ALC control circuit is an automatic level control circuit, and the purpose of controlling the level of the amplified doppler signal output by the amplification module 41 is achieved by feedback-controlling the strength of the amplified doppler signal output by the amplification module 41, so that the sensitivity of the self-excited adaptive microwave detector can be reduced by reducing the gain of the amplification module 41. The AGC control circuit is an automatic gain control circuit, wherein the AGC control circuit adaptively decreases the gain of the amplification module 41 based on the strength of the doppler signal to decrease the sensitivity of the self-excited adaptive microwave detector.
It can also be understood that, during an operation period, when the instantaneous fluctuation of the doppler signal output by the mix detection module 30 is large, the ALC control circuit or the AGC control circuit can adaptively decrease the sensitivity of the amplification module 41 to eliminate transient interference in the detection region.
It should be noted that, as shown in fig. 4, a second embodiment of the self-excited adaptive microwave detector is illustrated, wherein in the second embodiment, the
It is understood that the control unit 42A processes the amplified doppler signal output by the amplifying module 41A according to the action threshold value, that is, the valid data range of the self-excited adaptive microwave detector is defined by the action threshold value, specifically, when the intensity of the amplified doppler signal is smaller than the action threshold value, the amplified doppler signal is excluded from the valid data range of the control unit, that is, only when the intensity of the amplified doppler signal is larger than the action threshold value, the amplified doppler signal can be classified into the valid data range of the control unit. When the doppler signal is output by the self-excited adaptive microwave detector in the adaptive time period and there is fluctuation in the doppler signal, the doppler signal can be regarded as a self-excited interference signal in the detection region, so that the effective detection distance of the self-excited adaptive microwave detector can be correspondingly reduced by increasing the action threshold set by the control unit 42A, that is, the effective data range of the self-excited adaptive microwave detector can be correspondingly reduced, and the doppler signal output by self-excited interference can be actively excluded to exclude self-excited interference.
It should be noted that, as shown in fig. 5 and fig. 6, a third embodiment of the self-excited adaptive microwave detector is illustrated, wherein in the third embodiment, the signal processing unit 40B includes an amplifying module 41B electrically connected to the mixing and detecting module 30 and a control unit 42B electrically connected to the amplifying module 41B, wherein when there is fluctuation in the doppler signal output by the mixing and detecting module 30 during the adaptive time period, the control unit 42B performs attenuation processing on the doppler signal, thereby adaptively reducing the sensitivity of the self-excited adaptive microwave detector.
Specifically, the control unit 42B is provided with an intermediate frequency output attenuation circuit 44B, wherein the intermediate frequency output attenuation circuit 44B is configured to attenuate the doppler signal when there is fluctuation in the doppler signal output by the mix detection module 30 in the adaptive time period.
It should be noted that, the intermediate frequency output attenuation circuit 44B may attenuate the doppler signal output by the mixing and detecting module 30, or may attenuate the doppler signal amplified by the amplifying module 41B, which is not limited in the present invention.
In particular, in the case where the intermediate frequency output attenuation circuit 44B is shown in fig. 6, it can be understood that the intermediate frequency output attenuation circuit 44B reduces the intensity of the doppler signal after the doppler signal attenuation processing, so that the doppler signal is excluded from the effective data range of the self-excited adaptive microwave detector.
It should be noted that, in some embodiments of the present invention, the
Optionally, the filtering module may be configured as one of software filtering, hardware filtering circuit, or notch circuit.
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 invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.
- 上一篇：一种医用注射器针头装配设备
- 下一篇：基于稀疏表示的无线电引信抗箔条干扰方法