Improved minimum cost flow insar phase unwrapping method

A phase unwrapping and minimum technology, applied in the field of signal processing, to achieve the effect of reducing difficulty

Active Publication Date: 2019-03-29
BEIHANG UNIV
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Problems solved by technology

[0006] The technical solution of the present invention: In order to solve the problem of traditional minimum cost flow unwrapping, an improved minimum cost flow InSAR phase unwrapping method is provided, which can effectively reduce the regional unwrapping error caused by complex terrain in traditional minimum cost flow phase unwrapping , to increase the success rate of unwrapping

Method used

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Embodiment Construction

[0049] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0050] Such as figure 1 As shown, an improved minimum cost flow InSAR phase unwrapping method of the present invention is specifically implemented as follows:

[0051] Step 1: Set the winding interferometric phase matrix with the size of M rows and N columns as:

[0052] f i,j , (i,j)∈S,S={(i,j)|0≤i≤M-1,0≤j≤N-1}

[0053] Δ 1 f i,j is the distance discrete partial derivative, Δ 2 f i,j is the azimuth discrete partial derivative, then:

[0054]

[0055] in:

[0056] S 1 ={(i,j)|0≤i≤M-1,0≤j≤N-2}

[0057] S 2 ={(i,j)|0≤i≤M-2,0≤j≤N-1}

[0058]

[0059] If there is:

[0060] f 1 (i,j+1)-F 1 (i,j)=F 2 (i+1,j)-F 2 (i, j), 0≤i≤M-2, 0≤j≤N-2 (1.2.3)

[0061] Then the gradient field of this function is an irrotational field, that is to say, the integral results along any path are consistent.

[0062]

[0063] For constructing the unwra...

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Abstract

The invention relates to an improved minimum cost flow insar phase unwrapping method. According to the invention, a minimum cost flow phase unwrapping model is globally optimized. During the calculation of the phase gradient, the error superposition is easily caused when the path integration is carried out. When a target terrain obtained by a synthetic aperture radar is too steep, the elevation difference of the target between adjacent pixels exceeds an fuzzy range. In this way, a real phase value can be caused to jump, so that an unwrapping error transmission of the minimum cost flow algorithm is caused. A ground control point can assist in INSAR phase unwrapping, and the unwrapping success rate is improved. However, according to the existing phase unwrapping algorithm, the correction iscarried out by utilizing a control point after an unwrapping result is obtained, wherein the information of the control point is not really merged into the minimum cost flow unwrapping algorithm. According to the invention, a reasonable optimization objective function is constructed and the noise superposition caused by path integral is reduced due to the fact that the minimum cost flow unwrappingmodel is reduced. Meanwhile, the information of the control point is introduced into the model of the unwrapping algorithm, so that the unwrapping result is more accurate.

Description

technical field [0001] The invention relates to an improved minimum cost stream InSAR phase unwrapping method, which belongs to the field of signal processing. Background technique [0002] In the process of InSAR data processing, phase unwrapping is the key process of synthetic aperture radar interferometry, and its accuracy directly affects the accuracy of digital elevation model generated by InSAR. The existing phase unwrapping methods all assume that the absolute value of the interference phase difference of each adjacent pixel is less than π. However, noise and abrupt topography caused by factors such as shadows and decorrelation often cause phase data discontinuity, which brings great difficulties to phase unwrapping. At present, most algorithms cannot solve these problems satisfactorily, and the results of unwrapping often have large errors, and the resulting digital elevation model will be quite different from the actual situation. How to extract useful information...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9023
Inventor 徐华平宋泽宁杨波罗尧
Owner BEIHANG UNIV
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