InSAR (Interferometric Synthetic Aperture Radar) phase unwrapping method and system in high-noise area based on ant colony algorithm

Abstract

The invention provides an InSAR (Interferometric Synthetic Aperture Radar) phase unwrapping method and system in a high-noise area based on an ant colony algorithm. The method comprises the following steps: scanning an interferometric phase diagram to generate a residual point distribution diagram; importing an ant colony algorithm, initializing an ant colony, setting parameters, and randomly placing M ants on a residual point; setting an initial distance threshold value; the probability of connection between the residual points is calculated, each ant randomly selects one unconnected residual point as a starting point, the residual point with the maximum probability in the opposite-polarity residual points with the distance smaller than a threshold value is searched to serve as an end point for connection, and a connecting line of the two residual points is obtained; updating the pheromones, recalculating the probability of the unconnected residual points and searching the connection points until no residual points meeting the conditions exist; and taking each connecting line as a branch tangent line for unwrapping to obtain an unwrapped phase diagram. By adopting the phase unwrapping method disclosed by the invention, branch tangent lines of a large number of residual error points in a high-noise area can be effectively shortened, the unwrapping accuracy is improved, and the target elevation information precision is finally improved.

Description

technical field [0001] The invention relates to the technical field of InSAR, in particular to an InSAR phase unwrapping method and system based on an ant colony algorithm in a high-noise area. Background technique [0002] InSAR phase unwrapping is a key step in InSAR technology. The quality of unwrapping results affects the final result of inversion of elevation. With the development of InSAR technology, there are more and more methods of InSAR phase unwrapping. Since the emergence of Since the concept of phase unwrapping began, more and more experts and scholars have carried out research on InSAR phase unwrapping. After years of research, the mainstream algorithms of phase unwrapping mainly include (1) Unwrapping methods based on path tracking, such as Goldstein branch cutting method, mass Graph-guided method, (2) optimization-based unwrapping methods such as least squares method, minimum norm method and network flow planning method, etc. Among them, the path tracking me...

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Problems solved by technology

[0004] However, a large number of residual points will appear when generating residual points in areas with serious image noise (such as densely wooded mountains), and excessively long and crossed branches will also appear when identifying residual points and establishing branch tangent lines through the traditional branch cutting method. situation, resulting in unwrapped areas, resulting in inaccurate results of the final phase unwrapping, making the accuracy of the extracted target elevation information not high

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