CN110632564A - Environment self-adaptive microwave detector and self-adaptive method - Google Patents
Environment self-adaptive microwave detector and self-adaptive method Download PDFInfo
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Abstract
The invention provides an environment self-adaptive microwave detector and a self-adaptive method, wherein the microwave detector is allowed to emit detection beams with different frequency/phase parameters in a frequency modulation mode, and a microwave interference source in a detection area is identified based on fluctuation of a difference signal output by difference of characteristic parameters between the detection beams and corresponding echoes, so that the working frequency/phase parameters of the microwave detector are set in an active evasive mode, the frequency of the microwave detector and the microwave interference source or the probability of the same frequency of the formed multiplying power difference frequency can be reduced, the probability of mutual interference between the microwave detector and the microwave interference source is further reduced, and the self-adaptive capacity of the microwave detector to different environments is improved.
Description
Technical Field
The invention relates to the field of microwave detection, in particular to an environment self-adaptive microwave detector and a self-adaptive method.
Background
In modern society, microwave detection technology in radio technology, especially microwave detection technology based on the doppler effect principle, is widely applied to various fields, and has become a very important part in people's life. Due to the wide application range of microwave detectors, microwave detectors face interference from different interference sources in different application scenarios. Such as interference from other radios. At present, frequency bands without authorization permission, such as 2.4Ghz, 5.8Ghz, 10.525Ghz, 24.125Gh and the like, are opened internationally in the microwave detection field, and the corresponding microwave detector can reduce interference to other radio equipment by observing certain transmission power (generally the transmission power is lower than 1W) when using the frequency bands, although the definition and permission of different frequency bands can specify the use frequency bands of the radios and reduce the probability of mutual interference between radios in different frequency bands, under the limited frequency band resource permission, the problem of mutual interference between radios in adjacent or same frequency bands is becoming more serious as the use coverage rate of radios in adjacent frequency bands or same frequency bands is increased, that is, when the microwave detector is applied in an environment where other adjacent or same frequency band radios are present, microwave detectors are inevitably subject to interference from adjacent or co-frequency band radios.
The microwave detector based on the microwave doppler effect principle determines whether there is a motion or an action in the detection area based on a change in the frequency of a signal observed when the signal source moves relative to the observation point, and therefore the microwave detector based on the microwave doppler effect principle can only determine whether there is a motion or an action and cannot identify the source of the motion or the action. Therefore, when the microwave detector receives the change of the frequency of the signal fed back by the interfering action source or the microwave interference source, the microwave detector may also mistakenly consider the signal as a trigger signal to perform normal operation, for example, when no human body exists in the detection area of the microwave detector, the microwave detector is triggered by the microwave interference source in the detection area to perform operation, which undoubtedly generates interference to the normal operation of the microwave detector and may cause waste of resources.
In addition, when the microwave detector is applied to different environments, due to different interference sources existing in the environments, the microwave detector may exhibit different working effects, for example, a microwave detector applied in a factory and a household microwave detector are subjected to different interference sources, which may cause the microwave detector used in a household scene to be falsely triggered after being installed in the factory, because the existing microwave detector is not suitable for the environment, which can also be understood as being caused by poor interference resistance of the existing microwave detector. However, it is not practical to configure different microwave detectors according to different application scenarios, which results in increased production cost on one hand and limited application range of the microwave detectors on the other hand.
As shown in fig. 1 and fig. 2, a block diagram of a conventional microwave probe using a 5.8Ghz band is illustrated, wherein the microwave probe includes an antenna loop 10P, an oscillator 20P, and a mixer detection unit 30P, wherein the oscillator 20P of the microwave probe is difficult to precisely control and fix a frequency in the 5.8Ghz band (5.725-5.875Ghz) during a manufacturing process due to a self-oscillation manner, and has a certain bandwidth, the antenna loop 10P is excited by the oscillator 20P to transmit an electromagnetic wave signal at the frequency of the oscillator 20P and receive a corresponding echo signal, the mixer detection unit 30P is simultaneously connected to the oscillator 20P and the antenna loop 10P to detect a frequency difference between the transmitted electromagnetic wave signal and the received echo signal, based on the microwave doppler effect principle, when there is a moving object in the detection area of the microwave detector, there is a frequency difference between the electromagnetic wave signal transmitted by the microwave detector and the received echo signal, so that the mixed detection unit 30P can output a doppler signal. It can be understood that, when there are other electromagnetic wave signals with frequencies corresponding to the frequency points with a certain bandwidth of the microwave detector in the detection area, the antenna loop 10P can also receive the electromagnetic wave signals and be interfered, that is, when the coverage of the electromagnetic wave in the 5.8Ghz band and the adjacent band is higher and higher, the probability that the microwave detector is interfered is also higher and higher.
Therefore, the microwave detector based on the microwave doppler effect principle, especially the microwave detector using 5.8Ghz band, will have an increasingly serious mutual interference problem, and the requirements of different environmental conditions on the microwave detector will be more severe.
Disclosure of Invention
An object of the present invention is to provide an environment adaptive microwave detector and an adaptive method, wherein the microwave detector is allowed to identify a microwave interference source in an environment by adjusting an operating frequency/phase parameter at least once in a frequency modulation manner, so as to actively set the operating frequency of the microwave detector while avoiding the microwave interference source, so as to reduce mutual interference between the microwave detector and the microwave interference source in the environment, thereby improving the adaptive capacity of the microwave detector to the environment.
Another object of the present invention is to provide an environment adaptive microwave detector and an adaptive method, wherein the microwave detector transmits a detection beam to a detection area based on the doppler effect principle and receives a corresponding echo to generate a difference signal when there is a difference in a characteristic parameter between the detection beam and the corresponding echo, and the difference signal is a response to the motion of an object in the detection area.
Another objective of the present invention is to provide an environment adaptive microwave detector and an adaptive method, wherein the microwave detector is allowed to emit the detection beam by adjusting at least one frequency/phase parameter in a frequency modulation manner, and whether the difference signal fluctuates or not is detected, so as to identify a microwave interference source in the detection area based on the fluctuation of the difference signal, and then set a working frequency/phase parameter of the microwave detector in a manner of actively avoiding the microwave interference source in the following, so as to reduce interference between the microwave detector and different microwave interference sources in various environments, and further improve the adaptive capacity of the microwave detector to the environment.
Another object of the present invention is to provide an environment adaptive microwave detector and an adaptive method, wherein the microwave detector is allowed to emit the detection beams with different frequencies by means of frequency modulation, so as to identify the microwave interference source in the detection region based on the fluctuation of the difference signal output between the detection beam and the corresponding echo, and emit the detection beam with a frequency different from that of the microwave interference source to the detection region, so as to avoid co-frequency of the detection beam emitted by the microwave detector and the frequency of the microwave interference source or the formed multiplying power difference frequency, i.e. to avoid mutual interference between the microwave detector and the microwave interference source.
It is another object of the present invention to provide an environment adaptive microwave detector and adaptive method, wherein the probability of the microwave detector interfering with the microwave interference source in the environment is reduced by allowing the microwave detector to reduce the probability of the same frequency as the microwave interference source in the detection area by adjusting the frequency/phase parameter at least once through frequency modulation.
Another object of the present invention is to provide an environment adaptive microwave detector and an adaptive method, wherein the difference signal generated between the detection beam and the corresponding echo after frequency modulation is judged as an interference signal when the difference signal does not fluctuate, so as to identify the microwave interference source based on the difference signal, which is beneficial to improving the accuracy of the feedback of the difference signal to the motion of the object in the detection area.
Another objective of the present invention is to provide an environment adaptive microwave detector and an adaptive method, wherein the difference signal and the fluctuation of the difference signal are used to feed back electromagnetic radiation frequency points in the same frequency band in the detection area, and a frequency modulation manner that can be actively evaded can be adopted for adjusting the frequency parameters of the microwave detector, so as to further improve the anti-interference performance of the microwave detector, thereby improving the adaptive capacity of the microwave detector to the environment.
It is another object of the present invention to provide an environment adaptive microwave detector and adaptive method, wherein when detecting the fluctuation of the difference signal, the microwave detector is maintained to operate at a frequency after frequency modulation, so as to actively avoid the mutual interference between the microwave interference source and the microwave detector in the detection area.
Another object of the present invention is to provide an environment adaptive microwave detector and an adaptive method, wherein the characteristic parameters of the microwave interference source are identified based on the fluctuation of the difference signal, so as to improve the accuracy of the characteristic parameters of the microwave interference source identified by the microwave detector, thereby being beneficial to improve the accuracy of the frequency parameter adjustment of the microwave detector.
Another objective of the present invention is to provide an environment adaptive microwave detector and an adaptive method, wherein the difference signal is a frequency difference signal generated according to a frequency difference between the transmitted detection beam and the corresponding echo, so as to determine a motion state of the object in the detection area, such as a movement or jogging state of the object in the detection area, according to a characteristic parameter of the frequency difference signal.
Another objective of the present invention is to provide an environment adaptive microwave detector and an adaptive method, wherein the difference signal is a phase difference signal generated according to a phase difference between the transmitted detection beam and the corresponding echo, so as to determine a motion state of an object in the detection area, such as a movement or jogging state of the object in the detection area, according to a characteristic parameter of the phase difference signal.
It is another object of the present invention to provide an environment adaptive microwave detector and adaptive method, wherein the microwave detector does not need to change the structure of the conventional microwave detector and expensive and complicated equipment, so that the present invention provides an economical and effective solution for the radiation interference resistance of the microwave detector.
Another objective of the present invention is to provide an environment adaptive microwave detector and an adaptive method, wherein an antenna loop of the microwave detector is a low impedance antenna, and a bandwidth of the microwave detector is narrowed by reducing impedance, which is beneficial to prevent a microwave signal received or generated by the microwave detector from being interfered by electromagnetic radiation of an adjacent frequency band.
Another objective of the present invention is to provide an environment adaptive microwave detector and an adaptive method, wherein the bandwidth of the microwave detector is narrowed, and then the adjustable frequency points of the microwave detector are increased in a fixed frequency band, such as a 5.8Ghz frequency band, so as to be beneficial to reducing the probability that the microwave detector adjusted by frequency modulation is interfered by electromagnetic radiation in the same frequency band, that is, to improving the radiation interference resistance of the microwave detector by adjusting the frequency parameters of the microwave detector by frequency modulation.
To achieve at least one of the above objects, the present invention provides an adaptive method of an environment adaptive microwave detector, comprising the steps of:
(a) transmitting a detection beam with a preset frequency/phase parameter in a detection area;
(b) receiving an echo formed by the detection beam being reflected within the detection region and outputting a difference signal corresponding to the difference in characteristic parameter between the detection beam and the echo; and
(c) starting the timing of an adaptive time period in the detection area under the condition of no-moving-object environment, and adjusting the frequency/phase parameters of the detection beams by the microwave detector based on the difference signal in the adaptive time period.
In an embodiment of the present invention, wherein the step (c) further comprises a step of: (c1) and when the difference signal has no fluctuation, setting the preset frequency/phase parameter as the working frequency/phase parameter of the microwave detector.
In an embodiment of the present invention, the adaptive method of the environment adaptive microwave detector further includes a step of: (d) maintaining an operating frequency/phase parameter of the microwave detector during an operating time period of the microwave detector.
In an embodiment of the present invention, wherein the step (c) further comprises a step of: (c2) and when the difference signal fluctuates, outputting a regulation signal, and adjusting the frequency/phase parameter of the detection wave beam by the microwave detector according to the regulation signal.
In an embodiment of the present invention, wherein the step (c) further comprises a step of: (c3) setting the adjusted frequency/phase parameter as the operating frequency/phase parameter of the microwave detector when the difference signal is not fluctuated in the step (c 2).
In an embodiment of the present invention, the adaptive method of the environment adaptive microwave detector further includes a step of: (d) maintaining an operating frequency/phase parameter of the microwave detector during an operating time period of the microwave detector.
In an embodiment of the present invention, in the step (c), the difference signal is received and detected by a control unit, and the adjustment signal is output when the difference signal fluctuates.
In an embodiment of the present invention, in the step (c), an oscillator provides an oscillation frequency, and the microwave detector is controlled to adjust the frequency/phase parameter of the detection beam in a manner that the control unit outputs the adjustment signal to the oscillator.
In an embodiment of the present invention, the control signal is a step voltage, so that the microwave detector emits the detection beam in a manner of adjusting a frequency/phase parameter.
In one embodiment of the present invention, the step voltage is formed based on switching between a high level, a low level and a high impedance state.
In an embodiment of the present invention, the step voltage is based on a step voltage change from a high level to a low level.
In an embodiment of the present invention, the control signal is an analog voltage, so that the microwave detector emits the detection beam in a manner of adjusting a frequency/phase parameter.
In an embodiment of the invention, the control signal is a pulse integration voltage, wherein the pulse integration voltage is a dc voltage after pulse width adjustment and integration.
In an embodiment of the present invention, the control signal is a current signal, so that the microwave detector emits the detection beam in a manner of adjusting a frequency/phase parameter.
In an embodiment of the present invention, in the step (b), a difference of the characteristic parameters between the detection beam and the echo is analyzed by a mixer detection unit to output the difference signal.
In one embodiment of the invention, in the step (b), the characteristic parameter is set as a frequency parameter, and the difference signal is a frequency difference signal generated according to a frequency difference between the detection beam and the echo.
In one embodiment of the invention, in the step (b), the characteristic parameter is set as a phase parameter, and the difference signal is a phase difference signal generated according to a phase difference between the detection beam and the echo.
The present invention also provides in another aspect an environment adaptive microwave detector, comprising:
an oscillator, wherein the oscillator is configured to output an excitation signal within a frequency band;
an antenna loop electrically connected to the oscillator, wherein the antenna loop is capable of being excited by the excitation signal to emit at least one detection beam having a frequency same as that of the excitation signal, so as to form a detection region within a detection range of the detection beam, and the antenna loop is capable of receiving the detection beam reflected within the detection region to form an echo;
the frequency mixing detection unit is electrically connected with the oscillator and the antenna loop respectively, can receive the excitation signal and an echo signal generated by the antenna loop according to the received echo, and can output a difference signal according to the characteristic parameter difference between the excitation signal and the echo signal;
the amplifying module is electrically connected with the mixing detection unit to amplify the difference signal; and
a control unit, wherein the control unit is electrically connected to the amplifying module and the oscillator respectively to be able to receive and detect the difference signal, wherein the control unit is configured to allow a start of a timing of an adaptive time period, and to output a control signal to the oscillator based on a fluctuation of the difference signal in the adaptive time period to control the oscillator to adjust a frequency of the excitation signal at least once, and to subsequently start an operation time period, wherein the oscillator outputs the excitation signal at a current frequency in the operation time period.
In an embodiment of the invention, the mixer detection unit is configured to output the difference signal according to a phase parameter difference between the excitation signal and the echo signal.
In an embodiment of the invention, the mixer detection unit is configured to output the difference signal according to a frequency parameter difference between the excitation signal and the echo signal.
In an embodiment of the invention, the control unit includes a frequency modulation module electrically connected to the oscillator and an interference identification module communicably connected to the frequency modulation module, wherein the interference identification module is configured to detect the difference signal and identify the microwave interference source in the detection area according to a fluctuation of the difference signal, and the frequency modulation module is configured to control the oscillator to output the frequency modulation output the excitation signal in a manner of outputting the control signal to the oscillator when the interference identification module detects the fluctuation of the difference signal.
In an embodiment of the present invention, the frequency modulation module and the interference identification module are integrated into a whole.
In an embodiment of the invention, the control signal output by the frequency modulation module is a step voltage.
In an embodiment of the present invention, the step voltage is based on switching between a high level, a low level and a high impedance state.
In an embodiment of the present invention, the step voltage is based on a step voltage change from a high level to a low level.
In an embodiment of the invention, the control signal output by the frequency modulation module is an analog voltage.
In an embodiment of the invention, the control signal output by the frequency modulation module is a pulse integration voltage, wherein the pulse integration voltage is a dc voltage after pulse width adjustment and integration processing.
In an embodiment of the invention, the control signal output by the frequency modulation module is a current signal.
Further objects and advantages of the invention will be fully apparent from the ensuing description and drawings.
Drawings
Fig. 1 is a schematic block diagram of a conventional microwave detector using a 5.8Ghz band.
Fig. 2 is a schematic frequency point distribution diagram of the conventional microwave detector using a 5.8Ghz band.
Fig. 3 is a logic block diagram of an adaptation method of the environment adaptive microwave detector according to a preferred embodiment of the present invention.
Fig. 4 is a schematic block diagram of the adaptive method of the environment adaptive microwave detector according to the above preferred embodiment of the present invention.
Fig. 5 is a schematic frequency distribution diagram of a microwave detector using 5.8Ghz band according to the present invention.
Fig. 6 is a schematic block diagram of the structure of the environment 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.
The invention provides an environment self-adaptive microwave detector and a self-adaptive method, wherein the microwave detector is allowed to emit detection beams with different frequencies in a frequency modulation mode, and a microwave interference source in a detection area is identified based on fluctuation of a difference signal output by difference of characteristic parameters between the detection beams and corresponding echoes, so that the working frequency of the microwave detector is set in an active evasion mode, the frequency of the microwave detector and the microwave interference source or the probability of the same frequency of the formed multiplying power difference frequency can be reduced, the probability of mutual interference between the microwave detector and the microwave interference source is further reduced, and the self-adaptive capacity of the microwave detector to different environments is improved. In addition, the oscillation frequency of the microwave detector is controlled and adjusted in a multi-state combined judgment mode, so that the anti-interference capability of the microwave detector is improved, and the self-adaptive capability of the microwave detector under different environments is further improved.
Specifically, as shown in fig. 3 and 4, the adaptive method of the environment adaptive microwave detector of the present invention includes the following steps:
(a) transmitting a detection beam with a preset frequency/phase parameter in a detection area;
(b) receiving an echo formed by the detection beam being reflected within the detection region and outputting a difference signal corresponding to the difference in characteristic parameter between the detection beam and the echo; and
(c) starting the timing of an adaptive time period in the detection area under the condition of no-moving-object environment, wherein the microwave detector adjusts the frequency/phase parameter of the detection beam based on the difference signal in the adaptive time period.
As shown in fig. 3, since the microwave detector of the present invention detects whether there is a movement of an object in the detection area based on the microwave doppler effect principle, in step (c), when the characteristic parameters between the detection beam and the echo are the same, that is, there is no fluctuation in the difference signal, there is no movement of an object in the detection area, and there is no electromagnetic interference of other radio devices transmitting the same characteristic parameters. That is, when the characteristic parameters between the detection beam and the echo are the same, the microwave interference source does not exist in the corresponding detection area. Thus, in the step (c), when the characteristic parameters between the detection beam and the echo are the same, the preset frequency/phase parameter is set as the operating frequency/phase parameter of the microwave detector, and when an object moves in the detection area, the microwave detector can receive an accurate movement trigger signal by emitting the detection beam with the preset frequency, so that the microwave detector can operate normally and without interference.
That is, wherein the step (c) further comprises a step of: (c1) and when the difference signal has no fluctuation, setting the preset frequency/limit parameter as the working frequency/phase parameter of the microwave detector.
It is understood that the microwave interference source may include radio interference and mechanical interference, and since the present invention detects the object motion in the detection area based on the doppler effect principle, when the characteristic parameters between the detection beam and the echo are the same, it can be considered that there is no other radio interference or other mechanical interference in the detection area.
It is further worth mentioning that, if the characteristic parameter of the step (c) can be set as a frequency parameter, the difference signal is a frequency difference signal generated according to a frequency difference between the detection beam and the echo, and thus it can be understood that, when the frequency parameter between the detection beam and the echo in the step (c) is the same, the preset frequency/phase parameter can be set as an operating frequency/phase parameter of the microwave probe to transmit the detection beam with the preset frequency/phase parameter.
It is further understood that, in some embodiments of the present invention, the characteristic parameter in step (c) may also be set as a phase parameter, and the difference signal is a phase difference signal generated according to a phase difference between the detection beam and the echo, so that it is understood that, when the phase parameter between the detection beam and the echo in step (c) is the same, the preset frequency/phase parameter may be set as an operating frequency/phase parameter of the microwave probe and the detection beam having the preset frequency/phase parameter may be transmitted, which is not limited by the present invention.
In summary, the present invention outputs the difference signal by the difference of the frequency parameter or the phase parameter between the transmitted detection beam and the echo, and feeds back the existence of the microwave interference source by analyzing the difference signal, so that the microwave detector transmits the detection beam actively avoiding the microwave interference source.
It should be understood that a change in the frequency parameter of the detection beam corresponds to a change in the phase parameter at the same time, and thus the frequency modulation of the detection beam of the present invention corresponds to an adjustment of the frequency/phase parameter of the detection beam.
It is worth mentioning that, in the step (c), when there is a difference in the characteristic parameter between the detection beam and the echo, that is, when there is a fluctuation in the difference signal, a regulation signal is output, the microwave detector adjusts the frequency/phase parameter of the detection beam according to the regulation signal, so as to set the operating frequency/phase parameter of the microwave detector by outputting the regulation signal at least once, thereby identifying and avoiding the microwave interference source in the detection region based on the fluctuation of the difference signal output by the detection beam and the corresponding echo.
That is, wherein the step (c) further comprises a step of: (c2) and when the difference signal fluctuates, outputting at least one regulating signal, and adjusting the frequency/phase parameter of the detection wave beam by the microwave detector according to the regulating signal.
It is worth mentioning that the regulation signal may be, but is not limited to, a step voltage, wherein the step voltage is formed based on switching between a high level, a low level and a high impedance state. In some embodiments of the present invention, the step voltage may also be based on a step voltage change between a high level and a low voltage.
In an embodiment of the present invention, the control signal may also be an analog voltage, so that the microwave detector emits the detection beam in a dynamic frequency manner within the frequency band.
In an embodiment of the invention, the control signal is a pulse integration voltage, wherein the pulse integration voltage is a dc voltage after pulse width adjustment and integration.
In an embodiment of the present invention, the control signal is a current signal, so that the microwave detector emits the detection beam in a manner of adjusting a frequency/phase parameter.
The method can control and adjust the oscillation frequency of the microwave detector in a combined judgment mode of states such as the step voltage, the analog voltage, the pulse integration voltage and the like, the current signal and the like, and is favorable for improving the anti-interference capability of the microwave detector so as to further improve the self-adaptive capability of the microwave detector to different environments.
It is to be understood that, in step (c), when there is a difference in the characteristic parameter between the detection beam and the echo, that is, there is a fluctuation in the difference signal, there is an object motion in the detection area or an electromagnetic wave emitted by another radio device, that is, there is an object motion in the detection area or the microwave interference source. However, in order to further determine and identify whether the difference signal is a real trigger signal, that is, a trigger signal generated by a motion of a corresponding detection target object, in step (c), the microwave detector sets an operating frequency/phase parameter of the microwave detector in a manner of outputting the adjustment signal at least once based on a fluctuation of the difference signal, so as to obtain a fluctuation of the difference signal output by the detection beam and the corresponding echo after frequency modulation, and further determine whether the microwave interference source exists in the microwave detection area based on the fluctuation of the difference signal, thereby determining whether the difference signal is a real trigger signal.
Specifically, when the difference signal output according to the difference of the characteristic parameter between the detection beam emitted after frequency modulation and the corresponding echo fluctuates, the microwave interference source exists in the corresponding detection region, it can be determined that other radio devices in the same frequency band exist in the detection region, and if the difference signal is an interference signal, the step of setting the working frequency/phase parameter of the microwave detector in the manner of outputting the regulation signal at least once in the step (c) is repeated to avoid the same frequency of the microwave detector and the microwave interference source; when the difference signal output according to the difference of the characteristic parameters between the detection wave beam transmitted after frequency modulation and the corresponding echo does not have fluctuation, the microwave interference source does not exist in the corresponding detection area, and the difference signal is a real trigger signal, so that the adjusted frequency/phase parameter can be set as the working frequency of the microwave detector, the microwave detector and the microwave interference source are prevented from having the same frequency, and the anti-interference capability of the microwave detector is improved so as to improve the self-adaption capability of the microwave detector to the environment.
That is, wherein the step (c) further comprises a step of: (c3) setting the adjusted frequency/phase parameter as the operating frequency/phase parameter of the microwave detector when the difference signal is not fluctuated in the step (c 2).
In particular, the adaptive method of the environment adaptive microwave detector of the present invention further comprises a step of: (d) maintaining an operating frequency/phase parameter of the microwave detector during an operating time period of the microwave detector.
It is understood that when there is no fluctuation in the difference signal in the step (c1) and the step (c3), i.e. there is no microwave interference source in the detection region, the operating frequency/phase parameters of the microwave detector can be maintained respectively, so that the microwave detector can operate without interference during its operating time period.
It should be understood that the operating time period of the microwave detector is timed after the adaptive time period of the microwave detector.
It is worth mentioning that, in the step (b), the microwave detector analyzes the difference of the characteristic parameters between the detection beam and the echo by a mixed detection unit to output the difference signal; and in the step (c), receiving and detecting the difference signal by a control unit, so as to output the regulation signal according to the fluctuation of the difference signal, and further the microwave detector regulates the frequency/phase parameter of the detection beam according to the regulation signal.
It is understood that the mixed detection unit may output the difference signal by analyzing a difference of a frequency parameter between the detection beam and the echo, and may also output the difference signal by analyzing a difference of a phase parameter between the detection beam and the echo, which is not limited by the present invention.
Further, in the step (c), an oscillator provides an oscillation frequency, and the microwave detector is controlled to adjust the frequency/phase parameter of the detection beam in a manner that the control unit outputs the control signal to the oscillator.
It should be noted that, in the adaptive method of the environment adaptive microwave detector of the present invention, in the step (c), the frequency of the detected beam may be adjusted by generating different working frequency points based on any one of and a combination of an existing automatic frequency control circuit (AFC), a Phase Locked Loop (PLL), and a direct digital frequency synthesizer (DDS), or the frequency/phase parameter of the detected beam may be adjusted by changing the output frequency of the oscillator in a feedback adjustment manner of inputting a frequency-variable control voltage/current to the oscillator, which is not limited in this invention.
It is to be understood that, in the step (b), when there is a difference in the characteristic parameter between the detection beam and the echo, the mixed detection unit outputs the difference signal, and in the step (c), the control unit receives the difference signal to output the regulation signal, so that the microwave detector adjusts the frequency/phase parameter of the detection beam, that is, adjusts the operating frequency/phase parameter of the microwave detector in such a manner that the control unit outputs the regulation signal to the oscillator.
It is understood that the transmission speed of the detection beam is based on the speed of light, the transmitting action of the detection beam in the step (a), the receiving action of the corresponding echo in the step (b) and the analyzing step of the characteristic parameters between the detection beam and the echo, and the step of setting the operating frequency/phase parameters of the microwave detector according to the difference signal in the step (c) may be considered to be performed simultaneously within a certain time, that is, the step (b) and the step (c) are performed simultaneously when the step (a) is performed, and in some embodiments of the present invention, the step (b) may not be performed during the step (c) of adjusting the frequency of the detection beam, so it should be understood that the description of the adaptive method of the environment adaptive microwave detector of the present invention does not constitute the steps (a), (b) and (c), The order of the steps (b) and (c) may be limited, and the steps including the steps (a), (b) and (c) may be regarded as the adaptive method of the environment-adaptive microwave detector according to the present invention.
It can also be understood that, since the moving speed of the object in the detection area is much less than the transmission rate of the electromagnetic wave based on the speed of light, in the adaptive method of the environment-adaptive microwave detector of the present invention, the time taken for the detection beam emitted in the step (a) to be reflected to form the corresponding echo and to be received is much less than the time taken for adjusting the frequency/phase parameter of the detection fluctuation in the step (c), then at the instant that the detection beam emitted in the step (a) is emitted to be reflected to form the corresponding echo and to be received, the frequency of the detection beam emitted in the step (a) is allowed to be considered as unchanged, that is, it is difficult for the frequency/phase parameter of the detection beam to be adjusted in a frequency modulation manner in the step (c) to cause interference to the difference signal output in the step (b), thereby enabling to maintain the accuracy of the feedback of the difference signal to the motion of the object within the detection area.
In the above embodiment of the present invention, the microwave interference source in the detection area is identified through the fluctuation of the difference signal, and the operating frequency of the microwave detector is adjusted through a frequency modulation manner, so as to actively avoid the interference of the microwave interference source to the microwave detector, thereby improving the adaptive capacity of the microwave detector to the detection area.
It will be appreciated that the frequency bin distribution of a microwave detector according to the invention using the 5.8Ghz band is illustrated as shown in figure 5. As can be seen from fig. 5, the adjustable frequency points of the detection beams of the microwave detector are increased, that is, the frequency of the detection beams of the microwave detector is adjusted in a frequency modulation manner, so that the adjustable frequency points of the detection beams of the microwave detector can be increased, the bandwidth of the microwave detector can be narrowed, and the improvement of the radiation interference resistance of the microwave detector in a manner of adjusting the frequency parameters of the microwave detector through frequency modulation is facilitated.
In another embodiment of the present invention, in the step (c), when there is a difference in the characteristic parameter between the detection beam and the echo, the difference signal is output and the microwave detector is controlled to transmit the detection beam in a manner of dynamically adjusting the preset frequency/phase parameter. That is, when it is detected that there may be an object motion or the microwave interference source in the detection area, the microwave detector may also be controlled to emit the detection beam in a dynamic frequency modulation manner, which is not limited by the present invention.
In another aspect, the present invention further provides an environment adaptive microwave detector, as shown in fig. 6, the environment adaptive microwave detector includes an oscillator 20, an antenna loop 10, a mixing detection unit 30, an amplifying module 40 and a control unit 50, wherein the oscillator 20 is configured to output an excitation signal within a frequency band, the antenna loop 10 is electrically connected to the oscillator 20 to be excited by the excitation signal to emit at least one detection beam having a same frequency as the excitation signal, so as to form a detection region within a detection range of the detection beam, the antenna loop 10 is capable of receiving the detection beam and reflecting the detection beam within the detection region to form an echo, the mixing detection unit 30 is electrically connected to the oscillator 20 and the antenna loop 10, respectively, the mixing detection unit 30 is capable of receiving the excitation signal and the antenna loop 10 is connected to the antenna loop 10 according to the connection range Receiving an echo signal generated by the echo and outputting a difference signal according to the characteristic parameter difference between the excitation signal and the echo signal, wherein the amplifying module 40 is electrically connected to the mixing and detecting unit 30 to amplify the difference signal, wherein the control unit 50 is electrically connected to the amplifying module 40 and the oscillator 20 respectively to be able to receive and detect the difference signal, wherein the control unit 50 is configured to allow a timing of an adaptation period to start, and to output a regulation signal to the oscillator 20 based on a fluctuation of the difference signal during the adaptation period, to control the oscillator 20 to adjust the frequency of the excitation signal at least once and subsequently start an on-time period, in which the oscillator outputs the excitation signal at the current frequency.
It should be noted that, the mix detection unit 30 is configured to output the difference signal according to the phase parameter difference between the excitation signal and the echo signal, and the mix detection unit 30 may also be configured to output the difference signal according to the frequency parameter difference between the excitation signal and the echo signal, that is, the difference signal may be a phase difference signal or a frequency difference signal, which is not limited in this disclosure.
Further, when the control unit 50 receives the difference signal, the control unit 50 analyzes the difference signal and outputs a control signal to the oscillator 20 according to the fluctuation of the difference signal, so as to control the oscillator 20 to output the excitation signal by adjusting the frequency at least once.
Further, in the preferred embodiment of the present invention, the control unit 50 includes a frequency modulation module 51 electrically connected to the oscillator 20, wherein the frequency modulation module 51 is configured to control the oscillator 20 to output the excitation signal in a frequency modulation manner by outputting the control signal to the oscillator 20.
Specifically, the control unit 50 further includes a disturbance identification module 52 communicatively connected to the frequency modulation module 51, wherein the disturbance identification module 52 is configured to detect the difference signal and identify the microwave interference source in the detection area according to the fluctuation of the difference signal, wherein when the disturbance identification module 52 detects that the difference signal generates the fluctuation, that is, the microwave interference source exists in the detection area, the frequency modulation module 51 outputs the control signal to the oscillator 20 to control the oscillator 20 to adjust the frequency of the excitation signal, so as to adjust the frequency of the detection beam emitted by the antenna loop 10.
It should be noted that the adjusting signal output by the frequency modulation module 51 may be, but is not limited to, an electrical signal such as a voltage signal, a current signal, etc., which is not limited in the present invention.
It can be understood that the interference identification module 52 identifies whether the microwave interference source exists in the detection region based on whether the difference signal has a fluctuation, specifically, when the interference identification module 52 detects that the difference signal has no fluctuation, identifies that the microwave interference source does not exist in the detection region, determines that the difference signal is a real trigger signal, and maintains the oscillator 20 to output the excitation signal with a fixed characteristic parameter, so as to maintain the antenna loop 10 to emit the detection beam with a fixed frequency; when the interference identification module 52 identifies that the microwave interference source exists in the detection area when detecting that the difference signal has fluctuation, it determines that the difference signal is an interference signal, and the frequency modulation module 51 outputs the adjustment signal to the oscillator 20 to control the oscillator 20 to adjust the frequency of the excitation signal, so as to adjust the frequency of the detection beam emitted by the antenna loop 10, so that the microwave detector emits the detection beam in a manner of actively avoiding the microwave interference source, so as to avoid mutual interference between the microwave detector and the microwave interference source.
In particular, the frequency modulation module 51 and the interference identification module 52 of the control unit 50 are integrated integrally, for example, the control unit 50 may be but not limited to a MCU, a DSP, an FPGA, and an external high-precision ADC integrated chip.
It should be noted that, the modulation signal outputted by the frequency modulation module 51 is a step voltage, that is, the frequency modulation module 51 outputs the modulation signal to the oscillator 20 in a manner of outputting a step voltage, so as to control the excitation signal to modulate frequency in a step manner, wherein when the frequency modulation module 51 controls the frequency of the detection beam emitted by the antenna loop 10 in a manner of outputting a step voltage pair in a manner of modulating frequency in a step manner, the control unit 50, the antenna loop 10 and the oscillator 20 may form a loop of closed-loop control.
Preferably, the step voltage may be based on switching between a high level, a low level and a high impedance state, or may be based on a step voltage change between a high level and a low level, which is not limited by the present invention.
In some embodiments of the present invention, the modulation signal output by the frequency modulation module 51 is an analog voltage, that is, the frequency modulation module 51 controls the characteristic parameter of the excitation signal output by the oscillator 20 to change in a manner of outputting an analog voltage to the oscillator 20, wherein the oscillator 20 excites the detection beam emitted by the antenna loop 10 in the same change manner. It will be further appreciated that the frequency modulation module 51 may allow the antenna loop 10 to output the detection beams at different frequencies by outputting analog voltages.
In some embodiments of the present invention, the modulation signal output by the frequency modulation module 51 is a pulse integration voltage, that is, the frequency modulation module 51 controls the characteristic parameter of the excitation signal output by the oscillator 20 to change in a manner of outputting the pulse integration voltage to the oscillator 20, wherein the oscillator 20 excites the detection beam emitted by the antenna loop 10 in the same change manner. Preferably, the pulse integration voltage is a pulse width regulated and integrated processed direct current voltage.
In some embodiments of the present invention, the modulation signal outputted from the frequency modulation module 51 is a current signal, wherein when the interference identification module 52 detects that the difference signal fluctuates, the frequency modulation module 51 controls the oscillator 20 to output the current signal to the oscillator 20 in a manner of controlling the oscillator 20 to output the excitation signal in a frequency modulation manner.
It should be noted that the amplifying module 40 may be provided independently from the control unit 50, or may be integrally integrated with the control unit 50, which is not limited in the present invention.
It is further worth mentioning that the antenna loop 10 comprises an antenna transmitting loop 11 and an antenna receiving loop 12, wherein the antenna transmitting loop 11 is configured to transmit the detection beam, and wherein the receiving loop is configured to receive the echo formed by the transmission of the detection beam in the detection area. The antenna transmitting loop 11 and the antenna receiving loop 12 may be configured as two different modules or may be configured as an integrated module, which is not limited in the present invention.
Alternatively, in some embodiments of the present invention, the oscillator 20 may be configured as a frequency-modulated oscillator 20, wherein when the control unit 50 receives the difference signal, the control unit 50 outputs a frequency-modulated control signal to the oscillator 20 to control the frequency-hopped oscillator 20 to adjust the frequency of the excitation signal within the frequency band.
In particular, the oscillator 20 is configured to provide the fundamental narrowband oscillation frequency with a crystal oscillator or a standard frequency source, allowing the oscillator 20 to frequency modulate the excitation signal at frequencies that are different multiples of the narrowband oscillation frequency.
Optionally, the oscillator 20 includes any one of an automatic frequency control circuit (AFC), a Phase Locked Loop (PLL), a direct digital frequency synthesizer (DDS), a Voltage Controlled Oscillator (VCO), a frequency divider, and a frequency multiplier, and a combination thereof, so as to frequency-modulate the excitation signal based on frequencies of different frequency multiplication stages generated by the narrow-band oscillation frequency provided by the crystal oscillator or the standard frequency source.
It should be understood by those skilled in the art that the implementation manner of the frequency-modulated output of the excitation signal is various, that is, the structure of the oscillator 20 is various, and the present invention is not limited to this, for example, but not limited to, any circuit module and combination of an automatic frequency control circuit (AFC), a phase-locked loop (PLL), and a direct digital frequency synthesizer (DDS) is used in the above examples to frequency-modulate the excitation signal based on the frequency of different frequency multiplication stages generated by the crystal oscillator or the narrow-band oscillation frequency based on the standard frequency source.
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.
Claims (28)
1. An adaptive method of an environment adaptive microwave detector, comprising the steps of:
(a) transmitting a detection beam with a preset frequency/phase parameter in a detection area;
(b) receiving an echo formed by the detection beam being reflected within the detection region and outputting a difference signal corresponding to the difference in characteristic parameter between the detection beam and the echo; and
(c) starting the timing of an adaptive time period in the detection area under the condition of no-moving-object environment, and adjusting the frequency/phase parameters of the detection beams by the microwave detector based on the difference signal in the adaptive time period.
2. The method of claim 1, wherein step (c) further comprises a step of: (c1) and when the difference signal has no fluctuation, setting the preset frequency/phase parameter as the working frequency/phase parameter of the microwave detector.
3. The method of claim 2, further comprising a step of: (d) maintaining an operating frequency/phase parameter of the microwave detector during an operating time period of the microwave detector.
4. The method of claim 1, wherein said step (c) further comprises a step of: (c2) and when the difference signal fluctuates, outputting a regulation signal, and adjusting the frequency/phase parameter of the detection wave beam by the microwave detector according to the regulation signal.
5. The method of claim 4, wherein said step (c) further comprises a step of: (c3) setting the adjusted frequency/phase parameter as the operating frequency/phase parameter of the microwave detector when the difference signal is not fluctuated in the step (c 2).
6. The method of claim 5, further comprising a step of: (d) maintaining an operating frequency/phase parameter of the microwave detector during an operating time period of the microwave detector.
7. The method according to claim 4, wherein in the step (c), the difference signal is received and detected by a control unit, and the regulation signal is outputted when the difference signal fluctuates.
8. The method according to claim 7, wherein in the step (c), an oscillator provides an oscillation frequency, and the microwave detector is controlled to adjust the frequency/phase parameter of the detection beam in a manner that the control unit outputs the control signal to the oscillator.
9. The method of claim 8, wherein the modulation signal is a stepped voltage to facilitate the microwave detector to emit the detection beam in a manner that adjusts frequency/phase parameters.
10. The method of claim 9, wherein the step voltage is formed based on switching between high, low, and high impedance states.
11. The method of claim 9, wherein the step voltage is based on a step voltage change between a high level to a low level.
12. The method of claim 8, wherein the control signal is an analog voltage to facilitate the microwave detector to emit the detection beam in a manner that adjusts frequency/phase parameters.
13. The method of claim 8, wherein the control signal is a pulse integrated voltage, wherein the pulse integrated voltage is a pulse width modulated and integrated processed dc voltage.
14. The method of claim 8, wherein the modulation signal is a current signal to facilitate the microwave detector to emit the detection beam in a manner that adjusts frequency/phase parameters.
15. The method according to any one of claims 1 to 14, wherein in the step (b), the difference of the characteristic parameter between the detection beam and the echo is analyzed by a mixer detection unit to output the difference signal.
16. The method according to claim 15, wherein in the step (b), the characteristic parameter is set as a frequency parameter, and the difference signal is a frequency difference signal generated from a frequency difference between the detection beam and the echo.
17. The method according to claim 16, wherein in the step (b), the characteristic parameter is set as a phase parameter, and the difference signal is a phase difference signal generated from a phase difference between the detection beam and the echo.
18. An environmentally adaptive microwave probe, comprising:
an oscillator, wherein the oscillator is configured to output an excitation signal within a frequency band;
an antenna loop electrically connected to the oscillator, wherein the antenna loop is capable of being excited by the excitation signal to emit at least one detection beam having a frequency same as that of the excitation signal, so as to form a detection region within a detection range of the detection beam, and the antenna loop is capable of receiving the detection beam reflected within the detection region to form an echo;
the frequency mixing detection unit is electrically connected with the oscillator and the antenna loop respectively, can receive the excitation signal and an echo signal generated by the antenna loop according to the received echo, and can output a difference signal according to the characteristic parameter difference between the excitation signal and the echo signal;
the amplifying module is electrically connected with the mixing detection unit to amplify the difference signal; and
a control unit, wherein the control unit is electrically connected to the amplifying module and the oscillator respectively to be able to receive and detect the difference signal, wherein the control unit is configured to allow a start of a timing of an adaptive time period, and to output a control signal to the oscillator based on a fluctuation of the difference signal in the adaptive time period to control the oscillator to adjust a frequency of the excitation signal at least once, and to subsequently start an operation time period, wherein the oscillator outputs the excitation signal at a current frequency in the operation time period.
19. The environment adaptive microwave probe according to claim 18, wherein the mixer detector unit is configured to output the difference signal based on a phase parameter difference between the excitation signal and the echo signal.
20. The environment adaptive microwave probe according to claim 18, wherein the mixer detector unit is configured to output the difference signal based on a difference in frequency parameter between the excitation signal and the echo signal.
21. The environment adaptive microwave detector according to any one of claims 18 to 20, wherein the control unit comprises a frequency tuning module electrically connected to the oscillator and a disturbance identification module communicatively connected to the frequency tuning module, wherein the disturbance identification module is configured to detect the difference signal and identify a microwave disturbance source in the detection area according to a fluctuation of the difference signal, wherein the frequency tuning module is configured to control the oscillator to frequency-tune the excitation signal in such a manner that the oscillator outputs the control signal to the oscillator when the disturbance identification module detects the fluctuation of the difference signal.
22. The environmentally adaptive microwave probe of claim 21, wherein the frequency modulation module and the interference identification module are integrated.
23. The environment adaptive microwave detector according to claim 21, wherein the modulation signal output by the frequency modulation module is a stepped voltage.
24. The environment adaptive microwave detector according to claim 23, wherein the step voltage is based on switching between high, low and high impedance states.
25. The environment adaptive microwave detector according to claim 23, wherein the step voltage is based on a step voltage change between a high level to a low level.
26. The environmentally adaptive microwave detector according to claim 21, wherein the modulation signal output by the frequency modulation module is an analog voltage.
27. The environment adaptive microwave detector according to claim 21, wherein the modulation signal output by the frequency modulation module is a pulse integration voltage, wherein the pulse integration voltage is a pulse width modulated and integrated processed dc voltage.
28. The environment adaptive microwave probe according to claim 21, wherein the modulation signal output by the frequency modulation module is a current signal.
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| PCT/CN2020/123664 WO2021078299A1 (en) | 2019-10-25 | 2020-10-26 | Adaptive microwave detector and adaptive method |
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