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InSAR (Interferometric Synthetic Aperture Radar) phase unwrapping method and system in high-noise area based on ant colony algorithm
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An ant colony algorithm and phase unwrapping technology, applied in the field of InSAR, can solve the problems of unwrapped, excessively long branch cuts and crosses, inaccurate phase unwrapping results, etc., and achieve the effect of improving accuracy and unwrapping accuracy.
Pending Publication Date: 2022-03-01
QUANZHOU INST OF EQUIP MFG
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[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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[0051] Please refer to figure 1 , Figure 3 to Figure 8 Shown, the present invention provides a kind of InSAR phase unwrapping method based on ant colony algorithm in high noise area, described method comprises:
[0052] Step S1, comprehensively scan the interferometric phase map, determine the relative coordinates of the residual points, and mark the polarity of the residual points to generate a distribution map of the residual points;
[0053] Step S2, import the ant colony algorithm, initialize the ant colony, and set parameters (including the coordinates of the residual point in the graph, the total number of ant colonies, the initial pheromone, the pheromone volatilization coefficient, the pheromoneheuristic factor, the expected heuristic factor, etc.) , randomly place M ants on each residual point, that is, place a total of k ants on all residual points, and place several ants on each residual point;
[0070] Please refer to Figure 2 to Figure 8 As shown, the present invention provides a kind of InSAR phase unwrapping system based on ant colony algorithm in high noise area, and described system comprises:
[0071] The residual point distribution map module is used to comprehensively scan the interferometric phase map, determine the relative coordinates of the residual point, and mark the polarity of the residual point to generate a residual point distribution map;
[0072] Initialize the ant colony module, which is used to import the ant colony algorithm, initialize the ant colony, and set parameters (including the coordinates of the residual points in the graph, the total number of ant colonies, the initial pheromone, the pheromone volatilization coefficient, the pheromone heuristic factor, and the expected heuristic Formula factors, etc.), randomly place M ants on each residual point, that is, place a total of k ants on all residual points, and place several ants on each ...
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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 colonyalgorithm 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 branchcutting 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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