CN108279404A - A kind of Dual-Channel SAR phase error correction approach based on Estimation of Spatial Spectrum - Google Patents
A kind of Dual-Channel SAR phase error correction approach based on Estimation of Spatial Spectrum Download PDFInfo
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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
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
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- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
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Abstract
The invention belongs to Radar Signal Processing Technology fields, disclose a kind of Dual-Channel SAR phase error correction approach based on Estimation of Spatial Spectrum, including:The echo-signal that Dual-Channel SAR system receives scene objects is obtained, two-dimensional frequency is compressed and transformed into row distance to pulse, ambiguity solution processing imaging is carried out and obtains SAR image;Main region and fuzzy region are determined in SAR image, and calculate the related coefficient of main region and fuzzy region;Second channel SAR signals after pulse pressure of adjusting the distance carry out phase compensation and replace the second channel SAR signals after pulse pressure;It repeats the above process, the cycle-index until reaching setting;The minimum value for obtaining related coefficient, optimal compensation phase is denoted as by its corresponding phase;SAR image is the SAR image after final phasing, the influence that effective solution obscuring component corrects channel error in the corresponding cycle of optimal compensation phase.
Description
Technical field
The invention belongs to Radar Signal Processing Technology field more particularly to a kind of Dual-Channel SARs based on Estimation of Spatial Spectrum
Phase error correction approach.
Background technology
It is more and more applied as high-resolution Wide swath SAR is imaged on remote sensing fields, while in order to obtain
Ambiguity solution effect, it is desirable that orientation multichannel characteristic is completely the same.However, by environment, the influence of the factors such as equipment, Ge Getong
There are inevitable errors between road.Presently, there are method have adjacency channel correlation function algorithm, by adjacency channel into
Row relevant treatment realizes channel phase errors estimation and a kind of channel error bearing calibration based on subspace orthogonality, this method
Using the orthogonality of signal space and spatial noise come estimating phase error, and it is applied to the correction of Distributed Small Satellite channel error
In, but the method does not account for the case where obscuring component changes with fundamental frequency, directly assumes known to obscuring component number often
Number.
Invention content
In view of the above-mentioned problems, the purpose of the present invention is to provide a kind of, the Dual-Channel SAR phase based on Estimation of Spatial Spectrum is missed
Difference correcting method, the influence that effective solution obscuring component corrects channel error.
In order to achieve the above objectives, the present invention is realised by adopting the following technical scheme.
A kind of Dual-Channel SAR phase error correction approach based on Estimation of Spatial Spectrum, the method includes:
Step 1, obtain Dual-Channel SAR system and receive the echo-signals of scene objects, to the echo-signal respectively into
The pulse compression of line-spacing descriscent, obtains the Dual-Channel SAR signal after pulse pressure, the Dual-Channel SAR signal after pulse pressure
Including the first passage SAR signals after pulse pressure and the second channel SAR signals after pulse pressure;
Step 2, the Dual-Channel SAR signal by described after pulse pressure transforms to two-dimensional frequency, and carries out ambiguity solution processing
Obtain the signal after ambiguity solution;
Step 3, the signal after the ambiguity solution is imaged to obtain SAR image;
Step 4, main region and fuzzy region are determined in the SAR image, and calculate the main region and described fuzzy
The related coefficient in region;
Step 5, to described, second channel SAR signals after pulse pressure carry out phase compensation and obtain the after phase compensation
Two channel SAR signals s'2(tr,ta)=s2(tr,ta)·exp(jφk), wherein trIndicate fast time, taIndicate slow time, phase
Position φkValue range be (0,2 π),L indicates that total cycle-index of setting, k indicate kth time cycle, k's
Initial value is 1, s2(tr,ta) indicate the second channel SAR signals after pulse pressure, s'2(tr,ta) indicate phase compensation after second
Channel SAR signals;
Second channel SAR signals after the phase compensation are replaced into the second channel SAR signals after pulse pressure;
Step 6, it enables the value of k add 1, repeats step 2 to step 5, record main region described in cycle every time and described
The value of the related coefficient of fuzzy region, total cycle-index until reaching setting;
Step 7, the minimum value for obtaining the related coefficient of the main region and the fuzzy region, by the related coefficient
The corresponding phase of minimum value is denoted as optimal compensation phase;SAR figures to be obtained in the corresponding cycle of the optimal compensation phase
Picture is the SAR image after final phasing.
Beneficial effects of the present invention are:Due to fuzzy energy and true primary area energy mutual aliasing in time domain, frequency domain,
Existing processing method is difficult under conditions of not losing resolution ratio, and the present invention effectively inhibits orientation compared to sub-aperture error correction
Caused by fuzzy " ghost ", and context of methods does not need to the apriority of obscuring component, the more effective clarity for promoting image.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is the stream of the Dual-Channel SAR phase error correction approach provided in an embodiment of the present invention based on Estimation of Spatial Spectrum
Journey schematic diagram;
Fig. 2 is provided in an embodiment of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the present invention provides a kind of Dual-Channel SAR phase error correction approach based on Estimation of Spatial Spectrum, such as Fig. 1 institutes
Show, the method includes:
Step 1, obtain Dual-Channel SAR system and receive the echo-signals of scene objects, to the echo-signal respectively into
The pulse compression of line-spacing descriscent, obtains the Dual-Channel SAR signal after pulse pressure, the Dual-Channel SAR signal after pulse pressure
Including the first passage SAR signals after pulse pressure and the second channel SAR signals after pulse pressure.
Step 1 specifically includes following sub-step:
(1a) obtains the echo-signal S' that Dual-Channel SAR system receives scene objectsi(tr,ta):
Wherein, the twin-channel channel number of i expressions, and i=1,2, trIndicate fast time, taIndicate slow time, ar() and
aa() is respectively the window function and orientation window function of radar linear frequency-modulated signal, R (ta,RB) it is antenna phase center to target
Oblique distance, RBTarget to the line of flight minimum distance, C indicate the light velocity, λ indicate centre frequency corresponding wavelength, γ indicate frequency modulation
Rate;
(1b) compresses the echo-signal into row distance to pulse respectively, obtains the letter of the Dual-Channel SAR after pulse pressure
Number
Wherein, sr(tr) it is matched filtering function, and sr(tr)=ar(tr)exp(-jπγtr 2), to obtain apart from pulse pressure
Dual-Channel SAR signal s afterwards1(tr,ta) and s2(tr,ta)。
Step 2, the Dual-Channel SAR signal by described after pulse pressure transforms to two-dimensional frequency, and carries out ambiguity solution processing
Obtain the signal after ambiguity solution.
Step 2 specifically includes following sub-step:
(2a) is by the principle of point in phase bit by the Dual-Channel SAR signal s after pulse pressure1(tr,ta) and s2(tr,ta) transformation
To two-dimensional frequency, two-dimensional frequency signal S (f are obtainedr,fb)=[S1(fr,fb),S2(fr,fb)]T, wherein frIndicate frequency of distance,
fbIndicate baseband frequency;
(2b) obtains array manifold matrix steering vector A (fb)=[α-1,α0,α1];Wherein, αrFor steering vector, andWherein, x1Indicate between second channel and first passage displaced phase center away from
From fbIndicate that baseband frequency, v indicate radar speed, r ∈ (- 1,0,1);
(2c) carries out ambiguity solution to the two-dimensional frequency signal and handles to obtain M signal Sref(tr,ta)=A-1(fb)·S
(fr,fb), to the M signal Sref(tr,ta) carry out after azimuth dimension and the inverse Fourier transform apart from dimension obtain ambiguity solution
Signal s (tr,ta)。
Step 3, the signal after the ambiguity solution is imaged to obtain SAR image.
Step 3 is specially:To the signal s (t after the ambiguity solutionr,ta) be imaged to obtain SAR image I0=s (tr,
ta)·H(ta);Wherein, H (ta) indicate azimuth match function, andkaIndicate orientation frequency modulation
Rate.
Step 4, main region and fuzzy region are determined in the SAR image, and calculate the main region and described fuzzy
The related coefficient in region.
Step 4 specifically includes following sub-step:
(4a) randomly selects the larger region of signal power as main region Imain;
It should be noted that the larger region of signal power is the region that will appear a large amount of false target, the region is tight
Ghost image rings the interpretation to image, and there are the fuzzy regions of a large amount of false targets as main region I for artificial arbitrary selection onemain,
It is concentrated mainly on I0Borderline region.
(4b) is according to the main region ImainRegional location determine corresponding fuzzy region IambRegional location:
Wherein,Indicate fuzzy region IambRight margin in SAR image I0Position, i.e. image array I0
Row,Indicate fuzzy region IambLeft margin in SAR image I0Position, i.e. image array I0 Row, NlAnd Nr
Main region I is indicated respectivelymainRight boundary, NaIndicate single channel orientation sampling number;Indicate fuzzy region Iamb
Coboundary in SAR image I0Position, i.e. image array I0 Row,Indicate fuzzy region IambLower boundary exist
SAR image I0Position, i.e. image array I0 Row, NuAnd NlMain region I is indicated respectivelymainUp-and-down boundary;
(4c) calculates the related coefficient of the main region and the fuzzy region:
Wherein, N indicates main region either total line number M expression main regions of fuzzy region or total columns of fuzzy region, institute
The size for stating main region is identical with the size of the fuzzy region, and
Imain(n, m) and Iamb(n, m) indicates the element value of line n m row in main region and fuzzy region, n ∈ (1, N), m ∈ respectively
(1, M).
Step 5, to described, second channel SAR signals after pulse pressure carry out phase compensation and obtain the after phase compensation
Two channel SAR signals s'2(tr,ta)=s2(tr,ta)·exp(jφk), wherein trIndicate fast time, taIndicate slow time, phase
Position φkValue range be (0,2 π),L indicates that total cycle-index of setting, k indicate kth time cycle, s2
(tr,ta) indicate the second channel SAR signals after pulse pressure, s'2(tr,ta) indicate the second channel SAR letters after phase compensation
Number;
Second channel SAR signals after the phase compensation are replaced into the second channel SAR signals after pulse pressure.
Step 6, it enables the value of k add 1, repeats step 2 to step 5, record main region described in cycle every time and described
The value of the related coefficient of fuzzy region, total cycle-index until reaching setting.
Step 7, the minimum value for obtaining the related coefficient of the main region and the fuzzy region, by the related coefficient
The corresponding phase of minimum value is denoted as optimal compensation phase;SAR figures to be obtained in the corresponding cycle of the optimal compensation phase
Picture is the SAR image after final phasing.
Effectiveness of the invention can be described further by following emulation and measured data.
1) data are emulated
1 simulation parameter of table
2) measured data result
Fig. 2 (a) is the data imaging after technical solution of the present invention correction as a result, abscissa indicates orientation, ordinate table
Show distance to Fig. 2 (b) is the imaging results corrected by subspace error calibration method, is used based on subspace error correction
Constant obscuring component and fixed obscuring component number;From imaging results above, it can be seen that Fig. 2 (b) goes out
Show and has significantly obscured, and Fig. 2 (a) as a result of accurate obscuring component number and compensates phase, in imaging results not
Occur significantly obscuring, and the method for the present invention does not need to the apriority of obscuring component, can further prove from imaging results
The validity of inventive algorithm.
One of ordinary skill in the art will appreciate that:Realize that all or part of step of above method embodiment can pass through
The relevant hardware of program instruction is completed, and program above-mentioned can be stored in computer read/write memory medium, which exists
When execution, step including the steps of the foregoing method embodiments is executed;And storage medium above-mentioned includes:ROM, RAM, magnetic disc or CD
Etc. the various media that can store program code.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (5)
1. a kind of Dual-Channel SAR phase error correction approach based on Estimation of Spatial Spectrum, which is characterized in that the method includes:
Step 1, obtain Dual-Channel SAR system and receive the echo-signals of scene objects, to the echo-signal into row distance to
Pulse is compressed, and the Dual-Channel SAR signal after pulse pressure is obtained, and the Dual-Channel SAR signal after pulse pressure includes distance
First passage SAR signals after pulse pressure and the second channel SAR signals after pulse pressure;
Step 2, the Dual-Channel SAR signal by described after pulse pressure transforms to two-dimensional frequency, and carries out ambiguity solution and handle to obtain
Signal after ambiguity solution;
Step 3, the signal after the ambiguity solution is imaged to obtain SAR image;
Step 4, main region and fuzzy region are determined in the SAR image, and calculate the main region and the fuzzy region
Related coefficient;
Step 5, to described, to carry out phase compensation obtains after phase compensation second logical for second channel SAR signals after pulse pressure
Road SAR signals s'2(tr,ta)=s2(tr,ta)·exp(jφk), wherein trIndicate fast time, taIndicate slow time, phasek
Value range be (0,2 π),L indicates that total cycle-index of setting, k indicate that kth time cycle, the initial value of k are
1, k ∈ [1,2 ..., L], s2(tr,ta) indicate the second channel SAR signals after pulse pressure, s'2(tr,ta) indicate that phase is mended
Second channel SAR signals after repaying;
Second channel SAR signals after the phase compensation are replaced into the second channel SAR signals after pulse pressure, and will
It is with the first passage SAR signals after pulse pressure as the Dual-Channel SAR signal after pulse pressure;
Step 6, it enables the value of k add 1, repeats step 2 to step 5, record main region described in cycle every time and described fuzzy
The value of the related coefficient in region, total cycle-index until reaching setting;
Step 7, the minimum value for obtaining the related coefficient of the main region and the fuzzy region, by the minimum of the related coefficient
It is worth corresponding phase and is denoted as optimal compensation phase;To which the SAR image obtained in the corresponding cycle of the optimal compensation phase is
SAR image after final phasing.
2. a kind of Dual-Channel SAR phase error correction approach based on Estimation of Spatial Spectrum according to claim 1, feature
It is, step 1 specifically includes following sub-step:
(1a) obtains the echo-signal S' that Dual-Channel SAR system receives scene objectsi(tr,ta):
Wherein, the twin-channel channel number of i expressions, and i=1,2, trIndicate fast time, taIndicate slow time, ar() and aa
() is respectively the window function and orientation window function of radar linear frequency-modulated signal, R (ta,RB) it is antenna phase center to scene mesh
Target oblique distance, RBFor the minimum distance of scene objects to the line of flight, C indicates that the light velocity, λ indicate the center frequency of SAR transmitting signals
Rate corresponding wavelength, γ indicate frequency modulation rate;
(1b) compresses the echo-signal into row distance to pulse, obtains the Dual-Channel SAR signal after pulse pressure
Wherein, sr(tr) it is matched filtering function, and sr(tr)=ar(tr)exp(-jπγtr 2);To obtain after pulse pressure
Dual-Channel SAR signal s1(tr,ta) and s2(tr,ta)。
3. a kind of Dual-Channel SAR phase error correction approach based on Estimation of Spatial Spectrum according to claim 1, feature
It is, step 2 specifically includes following sub-step:
(2a) is by the principle of point in phase bit by the Dual-Channel SAR signal s after pulse pressure1(tr,ta) and s2(tr,ta) transform to two
Frequency domain is tieed up, two-dimensional frequency signal S (f are obtainedr,fb)=[S1(fr,fb),S2(fr,fb)]T, wherein frIndicate frequency of distance, fbTable
Show baseband frequency, S1(fr,fb) indicate first passage SAR signals two-dimensional frequency signal, S2(fr,fb) indicate second channel SAR
The two-dimensional frequency signal of signal;
(2b) obtains array manifold matrix steering vector A (fb)=[α-1,α0,α1];Wherein, αrFor steering vector, andWherein, x1Indicate between second channel and first passage displaced phase center away from
From fbIndicate that baseband frequency, v indicate radar speed, r ∈ (- 1,0,1);
(2c) carries out ambiguity solution to the two-dimensional frequency signal and handles to obtain M signal Sref(tr,ta)=A-1(fb)·S(fr,
fb), to the M signal Sref(tr,ta) carry out azimuth dimension and the inverse Fourier transform apart from dimension and obtain the signal after ambiguity solution
s(tr,ta)。
4. a kind of Dual-Channel SAR phase error correction approach based on Estimation of Spatial Spectrum according to claim 1, feature
It is, step 3 is specially:
To the signal s (t after the ambiguity solutionr,ta) be imaged to obtain SAR image I0=s (tr,ta)·H(ta);
Wherein, H (ta) indicate azimuth match function, andkaIndicate orientation frequency modulation rate.
5. a kind of Dual-Channel SAR phase error correction approach based on Estimation of Spatial Spectrum according to claim 1, feature
It is, step 4 specifically includes following sub-step:
(4a) randomly selects any region of the signal power more than preset value as main region I in the SAR imagemain;
(4b) is according to the main region ImainRegional location determine corresponding fuzzy region IambRegional location:
Wherein,Indicate fuzzy region IambRight margin in SAR image I0Position, i.e. image array I0 Row,Indicate fuzzy region IambLeft margin in SAR image I0Position, i.e. image array I0 Row, NlAnd NrRespectively
Indicate main region ImainRight boundary, NaIndicate single channel orientation sampling number;Indicate fuzzy region IambIt is upper
Boundary is in SAR image I0Position, i.e. image array I0 Row,Indicate fuzzy region IambLower boundary in SAR
Image I0Position, i.e. image array I0 Row, NuAnd NlMain region I is indicated respectivelymainUp-and-down boundary;
(4c) calculates the related coefficient of the main region and the fuzzy region:
Wherein, N indicates main region either total line number M expression main regions of fuzzy region or total columns of fuzzy region, described
The size of main region is identical with the size of the fuzzy region, and
Imain(n, m) and Iamb(n, m) indicates the element value of line n m row in main region and fuzzy region, n ∈ (1, N), m ∈ respectively
(1, M).
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Cited By (10)
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CN108965194A (en) * | 2018-08-16 | 2018-12-07 | 北京邮电大学 | A kind of method and device that signal phase restores |
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CN110501708A (en) * | 2019-08-29 | 2019-11-26 | 北京航空航天大学 | A kind of spaceborne TOPSAR azimuth ambiguity degree analysis method of multichannel |
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CN111336964A (en) * | 2020-03-27 | 2020-06-26 | 重庆市计量质量检测研究院 | Error compensation method and measurement error evaluation method based on uniaxial symmetry standard device |
CN111336963A (en) * | 2020-03-27 | 2020-06-26 | 重庆市计量质量检测研究院 | Error compensation method and measurement error evaluation method based on biaxial symmetry standard device |
CN113419240A (en) * | 2021-04-26 | 2021-09-21 | 中国科学院空天信息创新研究院 | Moving target detection method based on dual-channel SAR, dual-channel SAR and storage medium |
CN116400310A (en) * | 2023-05-25 | 2023-07-07 | 中国科学院空天信息创新研究院 | Two-dimensional frequency domain azimuth multi-channel SAR error correction method |
CN116400310B (en) * | 2023-05-25 | 2023-07-28 | 中国科学院空天信息创新研究院 | Two-dimensional frequency domain azimuth multi-channel SAR error correction method |
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