CN113884034A - Radar micro-vibration target deformation quantity inversion method and device - Google Patents
Radar micro-vibration target deformation quantity 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
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- 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
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- 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 quantity inversion method and a 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 performing inversion of the deformation quantity of the radar micro-vibration target according to the differential phase and the modulation coefficient. The method can solve the problem of deformation quantity jumping and simultaneously accurately invert the deformation quantity of the vibration signal.
Description
Technical Field
The invention relates to the technical field of bridge vibration monitoring, in particular to a radar micro-vibration target deformation quantity inversion method and device.
Background
The radar measurement method has the advantages of all-time and all-weather work, deformation monitoring can be carried out on targets in a beam coverage range, and the accuracy measurement of the radar can reach the sub-millimeter magnitude, so that the radar is one of important means for bridge deformation monitoring.
The phase of the radar signal contains the distance information of the target, and the basic principle of inverting the deformation of the micro-vibration target 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.
The difficulty of the inversion of the deformation quantity of the radar micro-vibration target is that when the distance is long or the radar reflection signal of a vibration point is weak during bridge monitoring, the signal-to-noise ratio of a signal is low, the winding phenomenon of a differential phase occurs, the inverted deformation quantity jumps, vibration information is damaged, 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, Empirical Mode Decomposition (EMD) in the prior art can decompose complex signals into a series of finite and small intrinsic mode functions, has self-adaptability, better noise removal and target extraction effects, and has the phenomenon of mode aliasing; the adaptive noise cancellation method adjusts the weight coefficient of a filter through an improved variable step LMS algorithm for a signal to separate the signal and the noise, but the method denoises the deformation quantity obtained by differential interference phase integration, and deformation errors under high background noise are difficult to remove. Therefore, the existing inversion method of the deformation of the radar micro-vibration target is difficult to accurately invert the deformation of the vibration signal while solving the problem of deformation jump.
Therefore, there is a need for an inversion scheme of the deformation amount of the radar micro-vibration target that can overcome 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 performing radar micro-vibration target deformation quantity inversion and accurately inverting a vibration signal deformation quantity while solving the problem of deformation quantity jumping, 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;
and performing inversion of the deformation quantity of the radar micro-vibration target 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 performing radar micro-vibration target deformation quantity inversion and accurately inverting a vibration signal deformation quantity while solving the problem of deformation quantity jumping, and comprises the following components:
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 distance gate where the vibration target is located according to the distance compression domain signal;
the differential phase determining module is used for performing 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 the deformation quantity inversion module is used for inverting the deformation quantity of the radar micro-vibration target 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 which is stored on the memory and can be run on the processor, wherein when the processor executes the computer program, the inversion method of the radar micro-vibration target deformation quantity is realized.
An embodiment of the present invention further provides a computer-readable storage medium, which stores a computer program for executing the method for inverting the radar micro-vibration target deformation amount.
According to the embodiment of the invention, a distance compressed domain signal of a 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 performing inversion of the deformation quantity of the radar micro-vibration target 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 distance gate where the vibration target is located, so that the differential interference phase is effectively constrained, the phase winding is avoided, and the deformation quantity of the vibration signal is accurately inverted while the problem of deformation quantity jumping is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:
FIG. 1 is a schematic diagram of an inversion method of a deformation quantity of a radar micro-vibration target in an embodiment of the invention;
FIG. 2 is a geometric diagram of a radar monitoring a vibrating object in an embodiment of the present invention;
FIG. 3 is a schematic diagram of another radar micro-vibration target deformation quantity inversion method in the embodiment of the invention;
FIG. 4 is a diagram of an apparatus for inverting the target deformation amount of radar micro-vibration according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a computer device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
In order to perform radar micro-vibration target deformation quantity inversion and accurately invert a vibration signal deformation quantity while solving the problem of deformation quantity jump, an embodiment of the invention provides a radar micro-vibration target deformation quantity inversion method, which can include the following steps as shown in fig. 1:
103, 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 104, performing inversion of the deformation quantity of the radar micro-vibration target according to the differential phase and the modulation coefficient.
As shown in FIG. 1, the embodiment of the present invention compresses the domain signal by obtaining the distance 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 performing inversion of the deformation quantity of the radar micro-vibration target 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 distance gate where the vibration target is located, so that the differential interference phase is effectively constrained, the phase winding is avoided, and the deformation quantity of the vibration signal is accurately inverted while the problem of deformation quantity jumping is solved.
The inventors have found that differential phase wrapping occurs under low signal-to-noise conditions because the noise phase follows a random uniform distribution if the noise level is comparable to or stronger than the desired signal. Therefore, the amplitude of the additional direct current quantity is far larger than that of the vibration signal and the noise, the differential phase is restrained and is not wound, and the method for adding the direct current effectively solves the problem of deformation quantity jumping so as to effectively extract the vibration characteristic. Since the applicable scenario of the embodiment of the present invention is a target of micro-vibration, the following conditions need to be satisfied:
|x(τ)|＜＜λ
wherein, λ is the wavelength of the radar emission signal, x (τ) is the micro-vibration signal of the vibration point, and the amplitude of the micro-vibration signal is far smaller than the wavelength λ of the radar emission signal.
FIG. 2 is a geometric diagram of a radar monitoring vibration target, the radar position is determined, P is a vibration point, and the distance between the vibration point and the radar is R0The vibration point has amplitude M and frequency f in the radar sight line directionvThe simple harmonic vibration of (a) can be expressed as:
x(τ)＝M cos(2πfvτ)
where τ is the slow time. The radar transmits signals at a certain pulse repetition frequency, and the reflected signals of the point P are received by the radar receiver to obtain two-dimensional radar echo signals changing along with time.
In the embodiment, a distance compressed domain signal of the radar micro-vibration target is obtained.
In this embodiment, as shown in fig. 3, the distance compressed domain signal of the radar micro-vibration target is obtained as follows:
301, obtaining an echo signal of the radar after the radar is reflected by a vibration target;
and 302, performing pulse pressure processing on the echo signal to obtain a range compression domain signal of the radar micro-vibration target.
In specific implementation, the pulse pressure processing is carried out on the echo signal, namely, the Fourier transform is carried out on the echo signal, so that a distance compressed domain signal S of the radar micro-vibration target is obtainedr(t, τ), which can be expressed as:
wherein, t is a fast time,
complex reflection coefficient of vibration point, fcFor transmitting the center frequency of the signal, BrFor the transmit signal bandwidth, sinc is the sinc function, N (τ) is complex Gaussian white noise, t0Representing the time delay of the return of the signal from the target, the delay being a function of the slow time τ, t, due to the vibration of the vibration point0The expression of (a) is:
t0(τ)＝2R(τ)/C＝2(R0+x(τ))/C
where C is the speed of light and R is the instantaneous distance between the target and the radar, as a function of the slow time τ.
In the 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 specific implementation, the distance compression domain signal S is subjected tor(t, τ) by t-2R0(ii) determining a slow time signal S of the range gate at which the vibrating object is locatedr(τ), which can be expressed as:
wherein the initial phase
Comprises the following steps:
wherein, the lambda is the wavelength of the radar emission signal,
is the phase of the complex reflection coefficient, An(τ) is the amplitude of complex Gaussian white noise, obeying Rayleigh distributions,
is gaussian white in phase and follows a uniform distribution.
In the embodiment, after adding a direct current signal to a slow time signal of a range gate where the vibration target is located, 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 specific implementation, the slow time signal S of the distance gate where the vibration target is locatedr(tau) adding a direct current to obtain a new signal Sd(τ), expressed as:
the amplitude value of the additional direct current signal K is much larger than the amplitude value of the slow time signal, and the value of K may be 100 times of the original signal amplitude. Then, the signal S added with direct currentd(τ) differential interference is performed to extract a differential phase. Since the additional direct current K is much larger than the original signal amplitude, Sd(τ) can be approximated as:
for additional DC signal Sd(τ) the process of performing differential interference is:
wherein, the symbol*Denotes conjugation and Δ τ is the pulse repetition time interval. The direct extraction of the phase of the above equation yields the differential phase of the additional dc signal at the time interval of Δ τ.
In the embodiment, inversion of the deformation quantity of the radar micro-vibration target is carried out according to the differential phase and the modulation coefficient.
In this embodiment, performing inversion of the radar micro-vibration target deformation amount according to the differential phase and the modulation coefficient includes:
performing integration processing on the differential phase;
and performing inversion of the deformation quantity of the radar micro-vibration target according to the differential phase and the modulation coefficient after the integral processing.
In specific implementation, the differential phase is subjected to integral processing and then divided by a modulation coefficient alpha, finally, the deformation is obtained through inversion, wherein the vibration signal phase is modulated after the direct current is added, the differential phase after the direct current is added has a modulation coefficient relation with the real differential phase, the modulation coefficient is deduced, and the phase is divided by the modulation coefficient alpha according to the geometric relation
Can be approximated by the following formula:
wherein ,ArAnd
respectively representing the original signals SrThe function imag represents taking the imaginary part of the complex number.
Further, it is possible to obtain:
since | x (τ) | < λ, the approximation employed in the above equation includes:
therefore, the modulation coefficient alpha of the term to the vibration phase can be obtained according to the vibration information in the formula as follows:
wherein ,
as a first phase, ApIs the magnitude of the complex reflection coefficient,
can be obtained by comparing the original signal SrThe real part of (τ) is averaged.
The expression of the inversion distortion quantity is:
wherein ,
to add a differential phase to the dc signal.
The method for inverting the deformation of the micro-vibration target with the low signal-to-noise ratio and the additional direct current effectively solves the problem that the deformation jumps due to the winding of the signal noise on the phase, restricts the differential interference phase by adding the direct current signal to the range gate signal, avoids the winding of the phase, deduces the differential phase modulation coefficient brought by the additional direct current, and can accurately invert the deformation, thereby realizing the inversion of the deformation of the target with simple operation and high precision under high background noise.
Based on the same inventive concept, the embodiment of the invention also provides a radar micro-vibration target deformation quantity inversion device, which is described in the following embodiment. Because the principles for solving the problems are similar to the radar micro-vibration target deformation quantity inversion method, the implementation of the radar micro-vibration target deformation quantity inversion device can refer to the implementation of the method, and repeated parts are not described again.
Fig. 4 is a structural diagram of an apparatus for inverting a target deformation amount of radar micro-vibration according to an embodiment of the present invention, and as shown in fig. 4, the apparatus for inverting a target deformation amount of radar micro-vibration 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;
a differential phase determining module 403, configured to perform 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 determine a differential phase;
and a deformation quantity inversion module 404, configured to perform radar micro-vibration target deformation quantity inversion 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 the radar is reflected by a vibrating target;
and performing pulse pressure processing on the echo signal to obtain a range compressed domain signal of the radar micro-vibration target.
In one embodiment, the amplitude value of the dc signal is much larger than the amplitude value of the slow time signal.
In one embodiment, the deformation quantity inversion module 404 is further configured to:
performing integration processing on the differential phase;
and performing inversion of the deformation quantity of the radar micro-vibration target according to the differential phase and the modulation coefficient after the integral processing.
In summary, the embodiment of the present invention obtains the range 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 performing inversion of the deformation quantity of the radar micro-vibration target 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 distance gate where the vibration target is located, so that the differential interference phase is effectively constrained, the phase winding is avoided, and the deformation quantity of the vibration signal is accurately inverted while the problem of deformation quantity jumping is solved.
Based on the aforementioned inventive concept, as shown in fig. 5, the present invention further provides a computer device 500, which includes a memory 510, a processor 520, and a computer program 530 stored on the memory 510 and executable on the processor 520, wherein the processor 520 executes the computer program 530 to implement the aforementioned method for inverting the deformation amount of the radar micro-vibration target.
Based on the foregoing inventive concept, the present invention provides a computer-readable storage medium storing a computer program, which when executed by a processor, implements the foregoing radar micro-vibration target deformation amount inversion method.
As will be appreciated by one skilled in the art, 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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 above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A radar micro-vibration target deformation quantity inversion method is characterized by comprising 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 performing inversion of the deformation quantity of the radar micro-vibration target according to the differential phase and the modulation coefficient.
2. The method for inverting the deformation quantity of the 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 the radar is reflected by a vibrating target;
and performing pulse pressure processing on the echo signal to obtain a range compressed domain signal of the radar micro-vibration target.
3. The method for inverting the deformation quantity of the target of the micro-vibration of the radar as recited in 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 quantity of the radar micro-vibration target according to claim 1, wherein inverting the deformation quantity of the radar micro-vibration target according to the differential phase and the modulation coefficient comprises:
performing integration processing on the differential phase;
and performing inversion of the deformation quantity of the radar micro-vibration target according to the differential phase and the modulation coefficient after the integral processing.
5. An inversion device for deformation of a radar micro-vibration target is characterized by comprising:
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 distance gate where the vibration target is located according to the distance compression domain signal;
the differential phase determining module is used for performing 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 the deformation quantity inversion module is used for inverting the deformation quantity of the radar micro-vibration target according to the differential phase and the modulation coefficient.
6. The apparatus for inverting the target deformation amount of radar micro-vibration according to claim 5, wherein the compressed domain signal obtaining module is further configured to:
obtaining an echo signal of the radar after the radar is reflected by a vibrating target;
and performing pulse pressure processing on the echo signal to obtain a range compressed domain signal of the radar micro-vibration target.
7. The apparatus for inverting the deformation amount of a target of micro-vibration of radar according to claim 5, wherein the amplitude value of the DC signal is much larger than the amplitude value of the slow time signal.
8. The apparatus for inverting the deformation quantity of the target of radar micro-vibration according to claim 5, wherein the deformation quantity inversion module is further configured to:
performing integration processing on the differential phase;
and performing inversion of the deformation quantity of the radar micro-vibration target according to the differential phase and the modulation coefficient after the integral processing.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one 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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