Self-focusing Motion Compensation Method Based on Search SAR Image Phase Gradient

A phase gradient and motion compensation technology, applied in the field of image processing, can solve problems such as inability to focus, poor focusing effect, and reduce the number of iterations, so as to achieve the effect of speeding up and improving efficiency

Active Publication Date: 2016-08-17
XIDIAN UNIV
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Problems solved by technology

This method improves the accuracy of phase compensation in each iteration process, reduces the number of iterations of the phase gradient self-focusing PGA motion compensation method, and at the same time solves the problem of very few isolated strong points in the phase gradient self-focusing PGA motion compensation method. The focus effect of scattered point images is poor or even impossible to focus

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  • Self-focusing Motion Compensation Method Based on Search SAR Image Phase Gradient
  • Self-focusing Motion Compensation Method Based on Search SAR Image Phase Gradient
  • Self-focusing Motion Compensation Method Based on Search SAR Image Phase Gradient

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with the accompanying drawings.

[0046] Refer to attached figure 1 , Realize the concrete steps of the present invention as follows.

[0047] Step 1, input image domain data signal matrix.

[0048] The synthetic aperture radar image domain data signal matrix is ​​input, a row is arbitrarily selected from the image domain data signal matrix, and the image domain data signal of the selected row is used as the range unit data signal.

[0049] Step 2, obtaining the distance unit data signal matrix.

[0050] The coherent formula is used to perform coherent and normalized processing on the range unit data signal to obtain the energy of the range unit data signal, and calculate the energy of the range unit data signal according to the following formula:

[0051] β a = 1 d Σ b ...

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Abstract

The invention discloses a phase gradient autofocus motion compensation method based on SAR image search and solves the problems that in the prior art, the entropy convergence speed is low, the focusing effect of an image with few isolated and strongly-scattering points is poor and even the focusing is in failure. The method includes (1) inputting image domain data signal matrix; (2) acquiring distance unit data signal matrix; (3) shifting in a circular manner; (4) windowing; (5) correcting phase errors; (6) judging whether the entropy convergence conditions are met or not; (7) outputting phase correction data signal matrix. Compared with the prior art, the speed of the entropy convergence is increased, the phase error correcting efficiency is improved, and the focusing effect of the image with few isolated and strongly-scattering points is fine.

Description

technical field [0001] The invention belongs to the technical field of image processing, and further relates to a self-focusing motion compensation method based on search synthetic aperture radar (Synthetic Aperture Radar SAR) image phase gradient in the technical field of image imaging. The invention can solve the phase error of the synthetic aperture radar SAR image caused by the aircraft deviating from the azimuth track, and perform motion compensation for the phase error. Background technique [0002] Motion compensation is a key step in obtaining a well-focused image in synthetic aperture radar SAR imaging. Existing motion compensation methods are mainly divided into the following two categories: those based on instrumentation measurement and those based on signal processing. At present, among the existing self-focusing methods, the best focusing effect is the phase gradient self-focusing phase compensation method. [0003] ZhuDaiyin, JiangRui, MaoXinhua and ZhuZhaoda...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S7/40G01S13/904G01S13/9047G01S13/9019
Inventor 熊涛刘红英冯婕李宁王爽侯彪马文萍杨淑媛张向荣
Owner XIDIAN UNIV
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