Structural strain and displacement monitoring method and system based on active microwave reflection

Abstract

The embodiment of the invention provides a structural strain and displacement monitoring method and system based on active microwave reflection. Frequency modulated continuous wave microwave signals are simultaneously transmitted to a target object through a plurality of microwave transceivers, and echo signals are received; extracting a target object distance in the sight line direction of each microwave transceiver and corresponding deformation and vibration information from the baseband signal; establishing a vibrating target multi-dimensional deformation and vibration reference coordinate system according to the spacing of the plurality of microwave transceivers and the distance between the microwave transceivers and the target object, obtaining a corresponding geometric length relationship, and calculating the coordinate of the target spatial position on each coordinate axis of the coordinate system; and performing weighted fusion reconstruction according to the projection of the target deformation and vibration on each coordinate axis in the coordinate system and the distance proportion from the target to each microwave transceiver, and recovering the actual multi-dimensional deformation and vibration information of the target object. The problems that in the prior art, dependence on the environment is high, precision is poor, and efficiency is low are solved, and the limitation that a microwave vibration measurement technology can only achieve single-dimensional measurement in the sight line direction is solved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of vibration measurement technology, and in particular to a method and system for monitoring structural strain and displacement based on active microwave reflection. Background Art

[0002] The basic process of vibration measurement is: the sensor converts the movement of the vibrating body into an electrical signal, but because the output signal (voltage or current) of the sensor is too weak, it cannot be directly used as the input of the display and analysis instrument, and needs to be amplified by a signal conditioner; because the sensor outputs an analog signal, and modern signal analysis processors and storage units use digital integrated circuits or computers, a data acquisition device must be used to convert the analog signal into a discrete digital signal before processing; and in order to avoid the sampled digital signal from incorrectly reflecting the original continuous signal, the signal must be filtered before sampling the continuous signal to remove the high-frequency component of the signal. In addition, if the measurement object is a mechanical part or structure without a vibration excitation source, an exciter must be used to apply excitation to the measured object to make it vibrate before measurement. The measured vibration signal is processed by a digital signal analyzer or a computer to obtain useful results such as power spectrum, structural modal parameters, and frequency response function.

[0003] The existing structural thermal and vibration deformation measurement method with sub-region identification and panoramic area feedback can only test the deformation and vibration along the line of sight, and cannot achieve accurate simultaneous measurement of the panoramic area deformation and vibration that are commonly present in actual working conditions in all dimensions. Summary of the invention

[0004] The embodiments of the present invention aim to solve at least one of the technical problems existing in the prior art, and provide a method and system for monitoring structural strain and displacement based on active microwave reflection.

[0005] In a first aspect, an embodiment of the present invention provides a method for monitoring structural strain and displacement based on active microwave reflection, the method comprising:

[0006] A frequency modulated continuous wave microwave signal is simultaneously transmitted to the target object through a number of microwave transceivers and an echo signal is received, and a baseband signal is obtained through amplification, mixing and filtering.

[0007] Collecting the baseband signal, and extracting the distance of the target object in the line of sight direction of each microwave transceiver and its corresponding deformation and vibration information from the baseband signal;

[0008] According to the spacing between a plurality of microwave transceivers and the distance between the microwave transceiver and the target object, a multi-dimensional deformation of the vibrating target and a vibration reference coordinate system ψ are established and a corresponding geometric length relationship is obtained;

[0009] Using the obtained geometric length relationship and the established reference coordinate system ψ, the coordinates of the target space position on each coordinate axis of the coordinate system ψ are calculated;

[0010] According to the projection of the target deformation and vibration on each coordinate axis in the coordinate system and the distance ratio from the target to each microwave transceiver, weighted fusion reconstruction is performed to restore the actual multi-dimensional deformation and vibration information of the target object.

[0011] In some possible embodiments, the simultaneously transmitting frequency modulated continuous wave microwave signals to the target object through a plurality of microwave transceivers includes:

[0012] Place the transmitting antennas of multiple microwave transceivers toward the measurement target so that the target to be measured is within the signal radiation range of the microwave transceiver, ensuring that the target motion space range to be measured is within the signal transmission and effective receiving range of the microwave transceiver.

[0013] In some possible embodiments, the weighted fusion reconstruction according to the projection of the target deformation and vibration on each coordinate axis in the coordinate system and the distance ratio from the target to each microwave transceiver includes:

[0014] x; (t)=a; r1(t)+a; 2r2(t)+a; r3(t)+...+ar(t); where, n≥i≥1;

[0015] a; ~a; are the weight values ​​of target deformation and vibration information on the line of sight of the microwave transceiver corresponding to the corresponding dimension in-n;

[0016] x; (t) is the target deformation and vibration information in the vibrating target multi-dimensional deformation and vibration reference coordinate system, that is, it represents the actual multi-dimensional deformation and vibration trajectory of the target in the vibrating target multi-dimensional deformation and vibration reference coordinate system.

[0017] In a second aspect, an embodiment of the present invention provides a structural strain and displacement monitoring system based on active microwave reflection, the system comprising: a multi-microwave transceiver and a multi-dimensional deformation and vibration processor, the multi-dimensional deformation and vibration processor comprising a signal acquisition unit and a signal processing unit;

[0018] The multi-microwave transceiver is used to simultaneously transmit frequency-modulated continuous-wave microwave signals to the target object and receive echo signals, and obtain baseband signals through amplification, mixing and filtering;

[0019] The signal acquisition unit is used to acquire the baseband signal;

[0020] The signal processing unit is used to: extract the distance of the target object in the line of sight direction of each microwave transceiver and its corresponding deformation and vibration information from the baseband signal; establish a multi-dimensional deformation of the vibrating target and a vibration reference coordinate system ψ according to the spacing between a plurality of microwave transceivers and the distance between the microwave transceiver and the target object, and obtain the corresponding geometric length relationship; calculate the coordinates of the target space position on each coordinate axis of the coordinate system ψ by using the obtained geometric length relationship and the established reference coordinate system ψ; perform weighted fusion reconstruction according to the projection of the target deformation and vibration on each coordinate axis in the coordinate system and the distance ratio from the target to each microwave transceiver, and restore the actual multi-dimensional deformation and vibration information of the target object.

[0021] In some possible embodiments, the multiple microwave transceivers are respectively installed on installation modules of different microwave transceivers at different positions in space, or at different positions of the same installation module.

[0022] In some possible embodiments, the signal processing unit is further configured to:

[0023] x; (t)=a; r1(t)+a; 2r2(t)+a; r3(t)+...+ar(t); where, n≥i≥1;

[0024] a; ~a; are the weight values ​​of target deformation and vibration information on the line of sight of the microwave transceiver corresponding to the corresponding dimension in-n;

[0025] x; (t) is the target deformation and vibration information in the vibrating target multi-dimensional deformation and vibration reference coordinate system, that is, it represents the actual multi-dimensional deformation and vibration trajectory of the target in the vibrating target multi-dimensional deformation and vibration reference coordinate system.

[0026] In some possible embodiments, the multi-dimensional deformation and vibration processor further includes a controller;

[0027] The controller is used to perform microwave multi-dimensional deformation and vibration measurement, set sampling parameters, execute signal acquisition, and control subsequent data processing.

[0028] In some possible embodiments, the system further includes a display and analysis module;

[0029] The display and analysis module is used to extract and analyze the vibration amplitude, vibration trajectory, frequency and time-frequency distribution vibration characteristics of the measured target multi-dimensional deformation and vibration time domain information according to needs, and display the multi-microwave transceiver signal waveform, related measurements, feature extraction results and the multi-dimensional deformation and vibration measurement information of the final target.

[0030] In some possible embodiments, each of the microwave transceivers includes: a microwave signal source, a power divider, a power amplifier, an orthogonal phase shifter, a low noise amplifier, a mixer, a low pass filter, at least one transmitting antenna and at least one receiving antenna, wherein:

[0031] The microwave signal source is connected to a power divider, and the power divider is connected to a power amplifier and an orthogonal phase shifter;

[0032] The power amplifier is connected to the transmitting antenna, the receiving antenna is connected to the low noise amplifier, the two output ends of the low noise amplifier and the orthogonal phase shifter are respectively connected to the mixer, and the two mixer output ends are respectively connected to the low pass filter;

[0033] The signal from the microwave signal source is divided into two paths through a power divider, one path is connected to the transmitting antenna through a power amplifier, and the other path is connected to the mixer through an orthogonal phase shifter.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The embodiments of the present invention solve the problems of the prior art such as high dependence on the environment, poor accuracy and low efficiency, and the limitation of microwave vibration measurement technology that it can only achieve single-dimensional measurement along the line of sight. The method for establishing a multi-dimensional deformation of a vibrating target and a vibration reference coordinate system is provided; the weight values ​​of the target deformation and vibration information on the line of sight of multiple microwave transceivers are used to calculate the target multi-dimensional deformation and vibration displacement information in the vibrating target multi-dimensional deformation and vibration reference coordinate system.

[0036] The embodiment of the present invention can realize the high-precision measurement of multi-dimensional deformation and vibration of the target or measuring point based on microwave sensing in a non-contact measurement mode, without being affected by the harsh environment such as occlusion, rain, fog, dust, etc. in the test scene, and without the need for related complex pre-test preparation work, and breaks through the limitation of microwave single-dimensional vibration measurement. The present invention is simple to operate and has efficient testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 It is a flow chart of the structural strain and displacement monitoring method based on active microwave reflection of the present invention;

[0039] Figure 2It is a schematic structural diagram of the structural strain and displacement monitoring system based on active microwave reflection of the present invention. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0041] Unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. "Including" or "comprising" used in the embodiments of the present invention neither limit the shapes, numbers, steps, actions, operations, components, originals and / or their groups mentioned, nor exclude the appearance or addition of one or more other different shapes, numbers, steps, actions, operations, components, originals and / or their groups, or the addition of these. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number and order of the indicated technical features. Thus, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0042] Unless otherwise specifically stated, the relative arrangement of the components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship, and the techniques, methods and devices known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and devices shown should be considered as part of the authorized specification. In all examples shown and discussed here, any specific other examples may have different values. It should be noted that similar symbols and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0043] In the description of the embodiments of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In the embodiments of the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in the embodiments of the present invention and the features of the different embodiments or examples, without contradiction.

[0044] Below, the exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described here.

[0045] like Figure 1 As shown, an embodiment of the present invention relates to a structural strain and displacement monitoring method based on active microwave reflection, the method comprising:

[0046] Step S1, using a plurality of microwave transceivers to simultaneously transmit frequency modulated continuous wave microwave signals to a target object and receive echo signals, and obtaining baseband signals through amplification, mixing and filtering.

[0047] Specifically, in this step, the transmitting antennas of multiple microwave transceivers are placed toward the measurement target so that the target to be measured is within the signal radiation range of the microwave transceiver, ensuring that the target motion space range to be measured is within the signal transmission and effective reception range of the microwave transceiver.

[0048] Step S2: collecting the baseband signal, and extracting the distance of the target object in the line of sight direction of each microwave transceiver and its corresponding deformation and vibration information from the baseband signal.

[0049] Step S3: establishing a multi-dimensional deformation of the target and a vibration reference coordinate system ψ according to the spacing between the microwave transceivers and the distance between the microwave transceivers and the target object, and obtaining a corresponding geometric length relationship.

[0050] Step S4: using the obtained geometric length relationship and the established reference coordinate system ψ, calculate the coordinates of the target space position on each coordinate axis of the coordinate system ψ.

[0051] Step S5: weighted fusion reconstruction is performed according to the projection of the target deformation and vibration on each coordinate axis in the coordinate system and the distance ratio from the target to each microwave transceiver to restore the actual multi-dimensional deformation and vibration information of the target object.

[0052] Specifically, in this step, the weighted fusion reconstruction is performed according to the projection of the target deformation and vibration on each coordinate axis in the coordinate system and the distance ratio from the target to each microwave transceiver, including:

[0053] x; (t)=a; r1(t)+a; 2r2(t)+a; r3(t)+...+ar(t); where, n≥i≥1;

[0054] a; ~a; are the weight values ​​of the target deformation and vibration information in the line of sight of the corresponding microwave transceiver in the corresponding dimension in-n; x; (t) is the target deformation and vibration information in the vibrating target multi-dimensional deformation and vibration reference coordinate system, which represents the actual multi-dimensional deformation and vibration trajectory of the target in the vibrating target multi-dimensional deformation and vibration reference coordinate system.

[0055] The structural strain and displacement monitoring method based on active microwave reflection of the embodiment of the present invention comprehensively solves the problems of high dependence on the environment, poor accuracy and low efficiency of the prior art and the limitation that microwave vibration measurement technology can only achieve single-dimensional measurement along the line of sight. The method for establishing a multi-dimensional deformation and vibration reference coordinate system of a vibrating target is adopted; the weight values ​​of the target deformation and vibration information on the line of sight of multiple microwave transceivers are used to calculate the target multi-dimensional deformation and vibration displacement information located in the vibrating target multi-dimensional deformation and vibration reference coordinate system.

[0056] The structural strain and displacement monitoring method based on active microwave reflection in the embodiment of the present invention can achieve non-contact measurement without being affected by the harsh environment such as occlusion, rain, fog, dust, etc. in the test scene, and does not require related complex pre-test preparation work. It can quickly and accurately achieve high-precision measurement of multi-dimensional deformation and vibration of the target or measuring point based on microwave perception, breaking through the limitation of microwave single-dimensional vibration measurement. The present invention is simple to operate and has efficient testing.

[0057] Based on the same inventive concept, Figure 2 As shown, an embodiment of the present invention provides a structural strain and displacement monitoring system based on active microwave reflection, the system comprising: a multi-microwave transceiver and a multi-dimensional deformation and vibration processor, the multi-dimensional deformation and vibration processor comprising a signal acquisition unit and a signal processing unit.

[0058] The multi-microwave transceiver is used to simultaneously transmit frequency modulated continuous wave microwave signals to the target object and receive echo signals, and obtain baseband signals through amplification, mixing and filtering. The signal acquisition unit is used to acquire the baseband signals.

[0059] The signal processing unit is used to: extract the distance of the target object in the line of sight direction of each microwave transceiver and its corresponding deformation and vibration information from the baseband signal; establish a multi-dimensional deformation of the vibrating target and a vibration reference coordinate system ψ according to the spacing between a number of microwave transceivers and the distance between the microwave transceiver and the target object, and obtain the corresponding geometric length relationship; use the obtained geometric length relationship and the established reference coordinate system ψ to calculate the coordinates of the target space position on each coordinate axis of the coordinate system ψ; perform weighted fusion reconstruction according to the projection of the target deformation and vibration on each coordinate axis in the coordinate system and the distance ratio from the target to each microwave transceiver, and restore the actual multi-dimensional deformation and vibration information of the target object.

[0060] The structural strain and displacement monitoring system based on active microwave reflection of the embodiment of the present invention comprehensively solves the problems of high dependence on the environment, poor accuracy and low efficiency of the prior art and the limitation that microwave vibration measurement technology can only achieve single-dimensional measurement along the line of sight, and adopts a method for establishing a multi-dimensional deformation of a vibrating target and a vibration reference coordinate system; utilizes the weight values ​​of the target deformation and vibration information on the line of sight of multiple microwave transceivers to calculate the target multi-dimensional deformation and vibration displacement information located in the vibrating target multi-dimensional deformation and vibration reference coordinate system.

[0061] The structural strain and displacement monitoring system based on active microwave reflection in the embodiment of the present invention can achieve non-contact measurement without being affected by the harsh environment such as occlusion, rain, fog, dust, etc. in the test scene, and does not require relevant complex pre-test preparation work. It can quickly and accurately achieve high-precision measurement of multi-dimensional deformation and vibration of the target or measuring point based on microwave perception, breaking through the limitation of microwave single-dimensional vibration measurement. The present invention is simple to operate and has efficient testing.

[0062] In some possible embodiments, the multiple microwave transceivers are respectively installed on installation modules of different microwave transceivers at different positions in space, or at different positions of the same installation module.

[0063] In some possible embodiments, the signal processing unit is further configured to:

[0064] x; (t)=a; r1(t)+a; 2r2(t)+a; r3(t)+...+ar(t); where, n≥i≥1;

[0065] a; ~a; are the weight values ​​of target deformation and vibration information on the line of sight of the microwave transceiver corresponding to the corresponding dimension in-n;

[0066] x; (t) is the target deformation and vibration information in the vibrating target multi-dimensional deformation and vibration reference coordinate system, that is, it represents the actual multi-dimensional deformation and vibration trajectory of the target in the vibrating target multi-dimensional deformation and vibration reference coordinate system.

[0067] In some possible embodiments, the multi-dimensional deformation and vibration processor further includes a controller;

[0068] The controller is used to perform microwave multi-dimensional deformation and vibration measurement, set sampling parameters, execute signal acquisition, and control subsequent data processing.

[0069] In some possible embodiments, the system further includes a display and analysis module;

[0070] The display and analysis module is used to extract and analyze the vibration amplitude, vibration trajectory, frequency and time-frequency distribution vibration characteristics of the measured target multi-dimensional deformation and vibration time domain information according to needs, and display the multi-microwave transceiver signal waveform, related measurements, feature extraction results and the multi-dimensional deformation and vibration measurement information of the final target.

[0071] In some possible embodiments, each of the microwave transceivers includes: a microwave signal source, a power divider, a power amplifier, an orthogonal phase shifter, a low noise amplifier, a mixer, a low pass filter, at least one transmitting antenna and at least one receiving antenna, wherein:

[0072] The microwave signal source is connected to a power divider, and the power divider is connected to a power amplifier and an orthogonal phase shifter;

[0073] The power amplifier is connected to the transmitting antenna, the receiving antenna is connected to the low noise amplifier, the two output ends of the low noise amplifier and the orthogonal phase shifter are respectively connected to the mixer, and the two mixer output ends are respectively connected to the low pass filter;

[0074] The signal from the microwave signal source is divided into two paths through a power divider, one path is connected to the transmitting antenna through a power amplifier, and the other path is connected to the mixer through an orthogonal phase shifter.

[0075] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A structural strain and displacement monitoring method based on active microwave reflection, characterized in that: The method comprises: A frequency modulated continuous wave microwave signal is simultaneously transmitted to the target object through a number of microwave transceivers and an echo signal is received, and a baseband signal is obtained through amplification, mixing and filtering. Collecting the baseband signal, and extracting the distance of the target object in the line of sight direction of each microwave transceiver and its corresponding deformation and vibration information from the baseband signal; According to the spacing between a plurality of microwave transceivers and the distance between the microwave transceiver and the target object, a multi-dimensional deformation of the vibrating target and a vibration reference coordinate system ψ are established and a corresponding geometric length relationship is obtained; Using the obtained geometric length relationship and the established reference coordinate system ψ, the coordinates of the target space position on each coordinate axis of the coordinate system ψ are calculated; According to the projection of the target deformation and vibration on each coordinate axis in the coordinate system and the distance ratio from the target to each microwave transceiver, weighted fusion reconstruction is performed to restore the actual multi-dimensional deformation and vibration information of the target object.

2. The structural strain and displacement monitoring method based on active microwave reflection according to claim 1 is characterized in that: The method of transmitting frequency modulated continuous wave microwave signals to the target object simultaneously by using a plurality of microwave transceivers comprises: Place the transmitting antennas of multiple microwave transceivers toward the measurement target so that the target to be measured is within the signal radiation range of the microwave transceiver, ensuring that the target motion space range to be measured is within the signal transmission and effective receiving range of the microwave transceiver.

3. The structural strain and displacement monitoring method based on active microwave reflection according to claim 1 is characterized in that: The weighted fusion reconstruction is performed according to the projection of the target deformation and vibration on each coordinate axis in the coordinate system and the distance ratio from the target to each microwave transceiver, including: x; (t)=a; r1(t)+a; 2r2(t)+a; r3(t)+...+ar(t); where, n≥i≥1; a; ~a; are the weight values ​​of target deformation and vibration information on the line of sight of the microwave transceiver corresponding to the corresponding dimension in-n; x; (t) is the target deformation and vibration information in the vibrating target multi-dimensional deformation and vibration reference coordinate system, that is, it represents the actual multi-dimensional deformation and vibration trajectory of the target in the vibrating target multi-dimensional deformation and vibration reference coordinate system.

4. A structural strain and displacement monitoring system based on active microwave reflection, characterized in that: The system comprises: a multi-microwave transceiver and a multi-dimensional deformation and vibration processor, wherein the multi-dimensional deformation and vibration processor comprises a signal acquisition unit and a signal processing unit; The multi-microwave transceiver is used to simultaneously transmit frequency-modulated continuous-wave microwave signals to the target object and receive echo signals, and obtain baseband signals through amplification, mixing and filtering; The signal acquisition unit is used to acquire the baseband signal; The signal processing unit is used to: extract the distance of the target object in the line of sight direction of each microwave transceiver and its corresponding deformation and vibration information from the baseband signal; establish a multi-dimensional deformation of the vibrating target and a vibration reference coordinate system ψ according to the spacing between a plurality of microwave transceivers and the distance between the microwave transceiver and the target object, and obtain the corresponding geometric length relationship; calculate the coordinates of the target space position on each coordinate axis of the coordinate system ψ by using the obtained geometric length relationship and the established reference coordinate system ψ; perform weighted fusion reconstruction according to the projection of the target deformation and vibration on each coordinate axis in the coordinate system and the distance ratio from the target to each microwave transceiver, and restore the actual multi-dimensional deformation and vibration information of the target object.

5. The structural strain and displacement monitoring system based on active microwave reflection according to claim 4 is characterized in that: The multiple microwave transceivers are respectively installed on installation modules of different microwave transceivers at different positions in space, or at different positions of the same installation module.

6. The structural strain and displacement monitoring system based on active microwave reflection according to claim 4 is characterized in that: The signal processing unit is further specifically used for: x; (t)=a; r1(t)+a; 2r2(t)+a; r3(t)+...+ar(t); where, n≥i≥1; a; ~a; are the weight values ​​of target deformation and vibration information on the line of sight of the microwave transceiver corresponding to the corresponding dimension in-n; x; (t) is the target deformation and vibration information in the vibrating target multi-dimensional deformation and vibration reference coordinate system, that is, it represents the actual multi-dimensional deformation and vibration trajectory of the target in the vibrating target multi-dimensional deformation and vibration reference coordinate system.

7. The structural strain and displacement monitoring system based on active microwave reflection according to claim 4 is characterized in that: The multi-dimensional deformation and vibration processor also includes a controller; The controller is used to perform microwave multi-dimensional deformation and vibration measurement, set sampling parameters, execute signal acquisition, and control subsequent data processing.

8. The structural strain and displacement monitoring system based on active microwave reflection according to any one of claims 4 to 7, characterized in that: The system also includes a display and analysis module; The display and analysis module is used to extract and analyze the vibration amplitude, vibration trajectory, frequency and time-frequency distribution vibration characteristics of the measured target multi-dimensional deformation and vibration time domain information according to needs, and display the multi-microwave transceiver signal waveform, related measurements, feature extraction results and the multi-dimensional deformation and vibration measurement information of the final target.

9. The structural strain and displacement monitoring system based on active microwave reflection according to any one of claims 4 to 7, characterized in that: Each of the microwave transceivers comprises: a microwave signal source, a power divider, a power amplifier, an orthogonal phase shifter, a low noise amplifier, a mixer, a low pass filter, at least one transmitting antenna and at least one receiving antenna, wherein: The microwave signal source is connected to a power divider, and the power divider is connected to a power amplifier and an orthogonal phase shifter; The power amplifier is connected to the transmitting antenna, the receiving antenna is connected to the low noise amplifier, the two output ends of the low noise amplifier and the orthogonal phase shifter are respectively connected to the mixer, and the two mixer output ends are respectively connected to the low pass filter; The signal from the microwave signal source is divided into two paths through a power divider, one path is connected to the transmitting antenna through a power amplifier, and the other path is connected to the mixer through an orthogonal phase shifter.

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