CN113884034B - Lei Dawei vibration target deformation inversion method and device - Google Patents
Lei Dawei vibration target deformation inversion method and device Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
- G01B15/06—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons for measuring the deformation in a solid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
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Abstract
The invention discloses a radar micro-vibration target deformation inversion method and device, wherein the method comprises the following steps: obtaining a distance compressed domain signal of a radar micro-vibration target; determining a slow time signal of a range gate where a vibration target is located according to the range compression domain signal; adding a direct current signal to a slow time signal of a range gate where the vibration target is located, and then performing differential interference processing to determine a differential phase; and carrying out inversion of the radar micro-vibration target deformation according to the differential phase and the modulation coefficient. The invention can accurately invert the deformation quantity of the vibration signal while solving the problem of deformation quantity jumping.
Description
Technical Field
The invention relates to the technical field of bridge vibration monitoring, in particular to a radar micro-vibration target deformation inversion method and device.
Background
The radar measurement method has the advantages of all-day and all-weather operation, can be used for monitoring deformation of targets in a beam coverage range, and can measure the accuracy of the radar to be in the sub-millimeter level, so that the radar is one of important means for monitoring bridge deformation.
The radar signal phase contains the distance information of the target, and the basic principle of inverting the micro-vibration target deformation is to perform differential interference on time sequence data acquired by the radar to acquire differential phase information, and extract the deformation through differential phase integration. The method can obtain high-precision vibration amplitude and vibration frequency, and is an important parameter for evaluating the health state of the bridge.
Lei Dawei inversion of the deformation quantity of the vibration target is difficult to achieve when the distance is far or the radar reflected signal of the vibration point is weak during bridge monitoring, the signal to noise ratio is low, the differential phase is wound, the inversion deformation quantity is caused to jump, the vibration information is destroyed, and the deformation quantity, the vibration frequency and other vibration characteristics of the target cannot be accurately reflected. Filtering deformation is a main method for denoising radar vibration signals, and in the prior art, empirical Mode Decomposition (EMD) can decompose complex signals into a series of finite small eigenmode functions, so that the method has self-adaptability, better noise and target extraction effect removal, and however, the phenomenon of mode aliasing exists; the adaptive noise cancellation method adjusts the weight coefficient of the filter through an improved variable step length LMS algorithm to separate signals and noise, but the method is to denoise the deformation obtained by differential interference phase integration, and deformation errors are difficult to remove under high background noise. Therefore, the existing radar micro-vibration target deformation quantity inversion method is difficult to accurately invert the vibration signal deformation quantity while solving the problem of deformation quantity jump.
Therefore, there is a need for a radar micro-vibration target deformation inversion scheme that overcomes the above problems.
Disclosure of Invention
The embodiment of the invention provides a radar micro-vibration target deformation quantity inversion method, which is used for inverting the radar micro-vibration target deformation quantity, solving the problem of deformation jump and simultaneously accurately inverting the vibration signal deformation quantity, and comprises the following steps:
obtaining a distance compressed domain signal of a radar micro-vibration target;
determining a slow time signal of a range gate where a vibration target is located according to the range compression domain signal;
adding a direct current signal to a slow time signal of a range gate where the vibration target is located, and then performing differential interference processing to determine a differential phase; wherein, a DC signal is added to a slow time signal of a range gate where a vibration target is positioned to obtain a new signal S d (τ), expressed as:
wherein K is an additional direct current signal; a is that p Is the magnitude of the complex reflection coefficient;is the initial phase; lambda is the wavelength of the radar emission signal; τ is the slow time; x (τ) is the micro-vibration signal of the vibration point; a is that n (tau) is the amplitude of the complex Gaussian white noise, subject to RayleighDistribution; />Is the phase of Gaussian white noise and is subject to uniform distribution; then, to the slow time signal S after the DC signal is added d (τ) performing differential interference to extract a differential phase; since the additional DC signal K is much larger than the slow time signal amplitude, S d (τ) may be approximated as:
for slow time signal S after adding DC signal d (τ) performing a differential interference process of:
wherein ,representing the phase of the slow time signal after the addition of the direct current signal; the symbol represents conjugation; delta tau is the pulse repetition time interval;
and carrying out inversion of the radar micro-vibration target deformation according to the differential phase and the modulation coefficient.
The embodiment of the invention provides a radar micro-vibration target deformation quantity inversion device, which is used for inverting the radar micro-vibration target deformation quantity, solving the problem of deformation jump and accurately inverting the vibration signal deformation quantity, and comprises the following steps:
the compressed domain signal acquisition module is used for acquiring a distance compressed domain signal of the radar micro-vibration target;
the slow time signal determining module is used for determining a slow time signal of a range gate where the vibration target is located according to the range compression domain signal;
the differential phase determining module is used for adding a direct current signal to the slow time signal of the range gate where the vibration target is located, and then performing differential interference processing to determine a differentialA phase; wherein, a DC signal is added to a slow time signal of a range gate where a vibration target is positioned to obtain a new signal S d (τ), expressed as:
wherein K is an additional direct current signal; a is that p Is the magnitude of the complex reflection coefficient;is the initial phase; lambda is the wavelength of the radar emission signal; τ is the slow time; x (τ) is the micro-vibration signal of the vibration point; a is that n (tau) is the amplitude of complex Gaussian white noise and obeys Rayleigh distribution; />Is the phase of Gaussian white noise and is subject to uniform distribution; then, to the slow time signal S after the DC signal is added d (τ) performing differential interference to extract a differential phase; since the additional DC signal K is much larger than the slow time signal amplitude, S d (τ) may be approximated as:
for slow time signal S after adding DC signal d (τ) performing a differential interference process of:
wherein ,representing the phase of the slow time signal after the addition of the direct current signal; the symbol represents conjugation; delta tau is the pulse repetition time interval;
and the deformation inversion module is used for inverting the radar micro-vibration target deformation according to the differential phase and the modulation coefficient.
The embodiment of the invention also provides computer equipment, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the radar micro-vibration target deformation inversion method when executing the computer program.
The embodiment of the invention also provides a computer readable storage medium, which stores a computer program for executing the radar micro-vibration target deformation inversion method.
According to the embodiment of the invention, the distance compressed domain signal of the radar micro-vibration target is obtained; determining a slow time signal of a range gate where a vibration target is located according to the range compression domain signal; adding a direct current signal to a slow time signal of a range gate where the vibration target is located, and then performing differential interference processing to determine a differential phase; and carrying out inversion of the radar micro-vibration target deformation according to the differential phase and the modulation coefficient. According to the embodiment of the invention, the direct current signal is added to the slow time signal of the range gate where the vibration target is located, so that the differential interference phase is effectively restrained, phase winding is avoided, and the deformation quantity of the vibration signal is accurately inverted while the problem of deformation quantity jump is solved.
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In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. In the drawings:
FIG. 1 is a schematic diagram of a method for inverting deformation of a radar micro-vibration target in an embodiment of the invention;
FIG. 2 is a geometric diagram of a radar-monitored vibratory target in an embodiment of the invention;
FIG. 3 is a schematic diagram of another method for inverting the deformation of a radar micro-vibration target according to an embodiment of the present invention;
FIG. 4 is a diagram of a radar micro-vibration target deformation inversion device in an embodiment of the invention;
FIG. 5 is a schematic diagram of a computer device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings. The exemplary embodiments of the present invention and their descriptions herein are for the purpose of explaining the present invention, but are not to be construed as limiting the invention.
In order to invert the deformation quantity of the radar micro-vibration target, and accurately invert the deformation quantity of the vibration signal while solving the problem of deformation quantity jump, the embodiment of the invention provides a method for inverting the deformation quantity of the radar micro-vibration target, as shown in fig. 1, which can comprise the following steps:
step 101, obtaining a distance compressed domain signal of a radar micro-vibration target;
102, determining a slow time signal of a range gate where a vibration target is located according to the range compression domain signal;
step 103, carrying out differential interference processing after adding a direct current signal to a slow time signal of a range gate where the vibration target is located, and determining a differential phase;
and 104, inverting the deformation quantity of the radar micro-vibration target according to the differential phase and the modulation coefficient.
As can be seen from fig. 1, the embodiment of the present invention obtains a distance compressed domain signal of a radar micro-vibration target; determining a slow time signal of a range gate where a vibration target is located according to the range compression domain signal; adding a direct current signal to a slow time signal of a range gate where the vibration target is located, and then performing differential interference processing to determine a differential phase; and carrying out inversion of the radar micro-vibration target deformation according to the differential phase and the modulation coefficient. According to the embodiment of the invention, the direct current signal is added to the slow time signal of the range gate where the vibration target is located, so that the differential interference phase is effectively restrained, phase winding is avoided, and the deformation quantity of the vibration signal is accurately inverted while the problem of deformation quantity jump is solved.
The inventors have found that under low signal-to-noise conditions, if the noise level is comparable to or stronger than the useful signal, differential phase wrapping results because the noise phase is subject to a random uniform distribution. Therefore, the amplitude of the additional direct current is far larger than that of the vibration signal and noise, the differential phase is restrained and is not wound, and the problem of deformation jump is effectively solved by the method of the additional direct current, so that the vibration characteristics are effectively extracted. Since the applicable scene of the embodiment of the invention is a micro-vibration target, the following conditions are required to be satisfied:
|x(τ)|＜＜λ
wherein lambda is the wavelength of the radar emission signal, x (tau) is the micro-vibration signal of the vibration point, and the amplitude of the micro-vibration signal is far smaller than the wavelength lambda of the radar emission signal.
FIG. 2 is a diagram showing the geometry of a radar monitoring vibration target, the radar position is determined, P is the vibration point, and the distance between the vibration point and the center of the radar is R 0 The vibration point has amplitude M and frequency f in the radar sight line direction v Can be expressed as:
x(τ)＝M cos(2πf υ τ)
where τ is the slow time. The radar transmits signals at a certain pulse repetition frequency, and the reflected signal of the P point is received by a radar receiver to obtain a two-dimensional radar echo signal which changes with time.
In an embodiment, a distance compressed domain signal of a radar micro-vibration target is obtained.
In this embodiment, as shown in fig. 3, a distance compressed domain signal of a radar micro-vibration target is obtained as follows:
step 301, obtaining an echo signal of the radar after being reflected by a vibration target;
and 302, performing pulse pressure processing on the echo signals to obtain distance compressed domain signals of the radar micro-vibration targets.
In specific implementation, pulse pressure processing is performed on the echo signals, namely Fourier transformation is performed on the echo signals, so as to obtain a distance compressed domain signal S of the radar micro-vibration target r (t, τ) can be expressed as:
wherein t is the fast time,is the complex reflection coefficient of the vibration point, f c To transmit signal center frequency, B r For transmitting signal bandwidth, sinc is a sinc function, N (τ) is complex Gaussian white noise, t 0 Representing the time delay of the return of the signal from the target, the delay being a function of the slow time t, t due to the oscillation of the oscillation point 0 The expression of (2) is:
t 0 (τ)＝2R(τ)/C＝2(R 0 +x(τ))/C
where C is the speed of light, R is the instantaneous distance between the target and the radar, and is a function of slow time τ.
In an embodiment, a slow time signal of a range gate where the vibration target is located is determined according to the range compression domain signal.
In particular implementation, for the distance compressed domain signal S r (t, τ) take t=2r 0 C, determining the slow time signal S of the range gate where the vibrating target is located r (τ), can be expressed as:
wherein, the primary phaseThe method comprises the following steps:
wherein lambda is the wavelength of the radar emission signal,for the phase of the complex reflection coefficient A n (tau) is the amplitude of the complex Gaussian white noise, subject to RayleighDistribution of->Is the phase of Gaussian white noise and is subject to uniform distribution.
In the embodiment, a direct current signal is added to a slow time signal of a range gate where the vibration target is located, and differential interference processing is performed to determine a differential phase.
In this embodiment, the amplitude value of the dc signal is much larger than the amplitude value of the slow time signal.
In particular, the slow time signal S of the range gate where the vibration target is located r (tau) adding a direct current to obtain a new signal S d (τ), expressed as:
the amplitude value of the additional direct current signal K is far larger than that of the slow time signal, and the value of K can be 100 times of that of the original signal. Then, to the signal S after the addition of direct current d (τ) differential interference is performed to extract a differential phase. Because the additional direct current K is far larger than the original signal amplitude, S d (τ) may be approximated as:
for additional DC signal S d (τ) performing a differential interference process of:
wherein the symbols represent conjugate, delta τ For pulse repetition time intervals. Directly extracting the phase to obtain additional DC signal at delta τ Is provided for the time interval of the differential phase of the time interval of (a).
In an embodiment, inversion of the radar micro-vibration target deformation is performed according to the differential phase and the modulation coefficient.
In this embodiment, according to the differential phase and the modulation coefficient, inversion of the deformation of the radar micro-vibration target is performed, including:
integrating the differential phase;
and carrying out inversion of the radar micro-vibration target deformation according to the differential phase and the modulation coefficient after the integration processing.
In specific implementation, the differential phase is divided by the modulation coefficient alpha after integral processing, and finally the inversion is performed to obtain a deformation, wherein the phase of the vibration signal is modulated after direct current is added, the modulation coefficient relation exists between the differential phase after direct current is added and the real differential phase, the modulation coefficient is deduced, and the phase j is calculated according to the geometric relation d The approximation can be made as follows:
wherein ,Ar Andrespectively represent the original signals S r The function imag represents taking the imaginary part of the complex number.
And then can obtain:
since |x (τ) | < λ, the approximation used in the above equation includes:
thus, the modulation factor α of the term to the vibration phase can be derived from the vibration information in the equation as:
wherein ,as the initial phase, A p Is the magnitude of the complex reflection coefficient +.>By the method of the original signal S r The real part of (τ) is averaged.
The expression of the inversion deformation is:
wherein ,is the differential phase of the additional dc signal.
The inversion method for the deformation quantity of the additional direct current low signal-to-noise ratio micro-vibration target effectively solves the problem of deformation quantity jump caused by phase winding of signal noise, constrains differential interference phases by adding direct current signals to the range gate signals, avoids phase winding, derives differential phase modulation coefficients caused by the additional direct current, and can accurately invert the deformation quantity, so that the deformation quantity of the target is inverted under the conditions of simple operation and high background noise.
Based on the same inventive concept, the embodiment of the invention also provides a radar micro-vibration target deformation inversion device, as described in the following embodiment. Because the principle of solving the problems is similar to that of the radar micro-vibration target deformation inversion method, the implementation of the Lei Dawei vibration target deformation inversion device can be referred to the implementation of the method, and the repetition is omitted.
Fig. 4 is a structural diagram of a radar micro-vibration target deformation inversion apparatus according to an embodiment of the present invention, and as shown in fig. 4, the radar micro-vibration target deformation inversion apparatus includes:
a compressed domain signal obtaining module 401, configured to obtain a distance compressed domain signal of the radar micro-vibration target;
a slow time signal determining module 402, configured to determine a slow time signal of a range gate where the vibration target is located according to the range compression domain signal;
the differential phase determining module 403 is configured to add a direct current signal to a slow time signal of a range gate where the vibration target is located, and then perform differential interference processing to determine a differential phase;
and the deformation inversion module 404 is configured to invert the radar micro-vibration target deformation according to the differential phase and the modulation coefficient.
In one embodiment, the compressed domain signal obtaining module 401 is further configured to:
obtaining an echo signal of the radar after being reflected by the vibration target;
and performing pulse pressure processing on the echo signals to obtain distance compressed domain signals of the radar micro-vibration targets.
In one embodiment, the amplitude value of the direct current signal is much larger than the amplitude value of the slow time signal.
In one embodiment, the deformation inversion module 404 is further configured to:
integrating the differential phase;
and carrying out inversion of the radar micro-vibration target deformation according to the differential phase and the modulation coefficient after the integration processing.
In summary, the embodiment of the invention obtains the distance compressed domain signal of the radar micro-vibration target; determining a slow time signal of a range gate where a vibration target is located according to the range compression domain signal; adding a direct current signal to a slow time signal of a range gate where the vibration target is located, and then performing differential interference processing to determine a differential phase; and carrying out inversion of the radar micro-vibration target deformation according to the differential phase and the modulation coefficient. According to the embodiment of the invention, the direct current signal is added to the slow time signal of the range gate where the vibration target is located, so that the differential interference phase is effectively restrained, phase winding is avoided, and the deformation quantity of the vibration signal is accurately inverted while the problem of deformation quantity jump is solved.
Based on the foregoing inventive concept, as shown in fig. 5, the present invention further proposes a computer device 500, including a memory 510, a processor 520, and a computer program 530 stored in the memory 510 and executable on the processor 520, where the processor 520 implements the foregoing radar micro-vibration target deformation inversion method when executing the computer program 530.
Based on the foregoing inventive concept, the present invention proposes a computer readable storage medium storing a computer program which, when executed by a processor, implements the foregoing radar micro-vibration target deformation inversion method.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The inversion method of the deformation quantity of the radar micro-vibration target is characterized by comprising the following steps of:
obtaining a distance compressed domain signal of a radar micro-vibration target;
determining a slow time signal of a range gate where a vibration target is located according to the range compression domain signal;
adding a direct current signal to a slow time signal of a range gate where the vibration target is located, and then performing differential interference processing to determine a differential phase; wherein, a DC signal is added to a slow time signal of a range gate where a vibration target is positioned to obtain a new signal S d (τ), expressed as:
wherein K is an additional direct current signal; a is that p Is the magnitude of the complex reflection coefficient;is the initial phase; lambda is the wavelength of the radar emission signal; τ is the slow time; x (τ) is the micro-vibration signal of the vibration point; a is that n (tau) is the amplitude of complex Gaussian white noise and obeys Rayleigh distribution; />Is the phase of Gaussian white noise and is subject to uniform distribution; then, to the slow time signal S after the DC signal is added d (τ) performing differential interference to extract a differential phase; since the additional DC signal K is much larger than the slow time signal amplitude, S d (τ) may be approximated as:
for slow time signal S after adding DC signal d (τ) performing a differential interference process of:
wherein ,representing the phase of the slow time signal after the addition of the direct current signal; the symbol represents conjugation; delta tau is the pulse repetition time interval;
and carrying out inversion of the radar micro-vibration target deformation according to the differential phase and the modulation coefficient.
2. The method for inverting the deformation of a radar micro-vibration target according to claim 1, wherein the distance compressed domain signal of the radar micro-vibration target is obtained as follows:
obtaining an echo signal of the radar after being reflected by the vibration target;
and performing pulse pressure processing on the echo signals to obtain distance compressed domain signals of the radar micro-vibration targets.
3. The method of inversion of the deformation of a radar micro-vibration target according to claim 1, wherein the amplitude value of the direct current signal is much larger than the amplitude value of the slow time signal.
4. The method for inverting the deformation of the radar micro-vibration target according to claim 1, wherein the inversion of the deformation of the radar micro-vibration target is performed according to the differential phase and the modulation factor, comprising:
integrating the differential phase;
and carrying out inversion of the radar micro-vibration target deformation according to the differential phase and the modulation coefficient after the integration processing.
5. The utility model provides a radar microvibration target deformation volume inversion device which characterized in that includes:
the compressed domain signal acquisition module is used for acquiring a distance compressed domain signal of the radar micro-vibration target;
the slow time signal determining module is used for determining a slow time signal of a range gate where the vibration target is located according to the range compression domain signal;
the differential phase determining module is used for adding a direct current signal to the slow time signal of the range gate where the vibration target is located, and then carrying out differential interference processing to determine a differential phase; wherein, a DC signal is added to a slow time signal of a range gate where a vibration target is positioned to obtain a new signal S d (τ), expressed as:
wherein K is an additional direct current signal; a is that p Is the magnitude of the complex reflection coefficient;is the initial phase; lambda is the wavelength of the radar emission signal; Γ is slow time; x (τ) is the micro-vibration signal of the vibration point; a is that n (tau) is the amplitude of complex Gaussian white noise and obeys Rayleigh distribution; />Is the phase of Gaussian white noise and is subject to uniform distribution; then, to the slow time signal S after the DC signal is added d (τ) performing differential interference to extract a differential phase; since the additional DC signal K is much larger than the slow time signal amplitude, S d (τ) may be approximated as:
for slow time signal S after adding DC signal d (τ) performing a differential interference process of:
wherein ,representing the phase of the slow time signal after the addition of the direct current signal; the symbol represents conjugation; delta tau is the pulse repetition time interval;
and the deformation inversion module is used for inverting the radar micro-vibration target deformation according to the differential phase and the modulation coefficient.
6. The radar micro-vibration target deformation inversion apparatus of claim 5, wherein the compressed domain signal acquisition module is further configured to:
obtaining an echo signal of the radar after being reflected by the vibration target;
and performing pulse pressure processing on the echo signals to obtain distance compressed domain signals of the radar micro-vibration targets.
7. The radar micro-vibration target deformation inversion apparatus according to claim 5, wherein the amplitude value of the direct current signal is much larger than the amplitude value of the slow time signal.
8. The radar micro-vibration target deformation inversion apparatus of claim 5, wherein the deformation inversion module is further configured to:
integrating the differential phase;
and carrying out inversion of the radar micro-vibration target deformation according to the differential phase and the modulation coefficient after the integration processing.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method of any of claims 1 to 4 when executing the computer program.
10. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program for executing the method of any one of claims 1 to 4.
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