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Interferometric synthetic aperture radar phase unwrapping method based on mesh-less method and frequency estimation

A technology of interferometric synthetic aperture and frequency estimation, which is applied to the reflection/re-radiation of radio waves, radio wave measurement systems, and the use of re-radiation. It can solve the problems of residual point error diffusion, processing, and incorrect residual point

Inactive Publication Date: 2015-10-28
XIDIAN UNIV
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Problems solved by technology

The least squares method has good robustness and does not depend on the integral path in the unwrapping process, but the disadvantage is that it does not process the residual points, which eventually causes the error caused by the residual points to spread to the entire image

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  • Interferometric synthetic aperture radar phase unwrapping method based on mesh-less method and frequency estimation

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Embodiment Construction

[0059] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0060] The present invention will be further described below in conjunction with the accompanying drawings.

[0061] refer to figure 1 , the specific implementation steps of the present invention are as follows:

[0062] Step 1. Obtain the interferometric phase map of the interferometric synthetic aperture radar.

[0063] An interferometric phase map with M*N pixels is obtained from two coherent SAR single views, and the value of each pixel represents the va...

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Abstract

The invention provides an interferometric synthetic aperture radar phase unwrapping method based on a mesh-less method and frequency estimation, and by adopting the method, the unwrapping precision among pixel points of an interferometric synthetic aperture radar phase diagram is improved. The phase unwrapping method comprises the following steps of: obtaining an interferometric phase diagram of an interferometric synthetic aperture radar; dividing the interferometric phase diagram into a plurality of sub interferometric phase diagrams, and calculating wrapping phase gradient values among adjacent pixel points in each sub interferometric phase diagram; determining a shape function of each sub interferometric phase diagram; according to the wrapping phase gradient values among the adjacent pixel points in each sub interferometric phase diagram and the shape function, obtaining a wrapping phase gradient function of each sub interferometric phase diagram; according to the wrapping phase gradient function of each sub interferometric phase diagram, solving an unwrapping phase value of each sub interferometric phase diagram; and according to the sub interferometric phase diagram, carrying out unwrapping on the interferometric phase diagram of the interferometric synthetic aperture radar.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and further relates to an interferometric synthetic aperture radar phase unwrapping method based on gridless and frequency estimation. By applying the InSAR phase unwrapping method based on the gridless method and local frequency to the interferometric synthetic aperture radar interferometric phase image between the pixel points, the real phase of the target can be obtained, and the unwrapping accuracy can be improved, so that the InSAR data processing accuracy can be improved. significantly improved. Background technique [0002] Since the middle of the last century, radar technology has developed rapidly, and many novel radar technologies have been proposed and used one after another. Interferometric Synthetic Aperture Radar (Interferometric Synthetic Aperture Radar (hereinafter referred to as InSAR) technology is one of the representatives. It is a new technology produced by t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/02
CPCG01S7/02G01S13/9023
Inventor 冯大政王逸凡杨凡张妍
Owner XIDIAN UNIV
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