Phase Unwrapping Method Based on Preconditioning and Adaptive Genetic Simulated Annealing Algorithm

Abstract

The invention discloses a phase unwrapping method based on preprocessing and adaptive genetic simulated annealing algorithm, comprising the following steps: preprocessing the residual points of adjacent dipoles within the distance threshold R; using the adaptive genetic simulated annealing algorithm to calculate Optimal combination of remaining residual points; use branch tangents to connect each pair of combined positive and negative residual points in the interferogram, and use the flooding method to bypass the branch tangents for phase unwrapping. The advantages of the present invention are as follows: 1. Part of the dipoles are preprocessed to the residual points by the preprocessing method of the variable distance threshold R, so that the length of the branch tangent line is short; 2. The remaining residual points are processed by the adaptive genetic simulated annealing algorithm The combination is optimized to form a short total length of branch tangents, less closed areas, and a short total computing time; 3. Due to the short set of branch tangents, the cumulative error around the branch tangents is reduced during unwrapping, improving the accuracy of unwrapping , and reduces the number of "islands" that cannot be unwound.

Description

technical field [0001] The invention relates to the technical field of INSAR phase unwrapping, in particular to a phase unwrapping method based on preprocessing and adaptive genetic simulated annealing algorithm. Background technique [0002] Interferometric Synthetic Aperture Radar (INSAR) is a high-precision remote sensing measurement technology. Compared with traditional optical remote sensing, it has the advantages of all-weather, all-time, and low cost. INSAR obtains the ground digital elevation model (Digital Elevation Model, DEM) and deformation by using the phase difference ψ of two or more SAR images of the same area. However, during actual data processing, the extracted phase It is obtained by taking the modulus of ψ to 2π, and its value range is (-π, π], which is generally called the winding phase, and the height of the target on the ground is proportional to the real phase difference ψ, therefore, only to retrieve The lost 2nπ can restore the real phase diffe...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems mentioned in the above background technology part by a phase unwrapping method based on preprocessing and adaptive genetic simulated annealing algorithm

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