Research On Robust Multi-channel InSAR Elevation Inversion

Multi-channel InSAR elevation reconstruction technology is a valuable three-dimensional imaging technology.Obtaining terrain height through the interference information between multiple SAR images can break through the limitations of the phase continuity assumption in traditional single-channel InSAR technology.It has higher precision in the generation of elevation model.Therefore,multi-channel InSAR elevation reconstruction technology has gradually become a research hotspot in the field of microwave remote sensing.This article focuses on the research and analysis of the multi-channel InSAR elevation reconstruction technology.The main research contents are as follows:(1)For many common multi-channel InSAR elevation reconstruction methods,including multi-channel InSAR elevation reconstruction algorithm based on cluster analysis,improved cluster analysis algorithm,multi-channel maximum likelihood elevation reconstruction algorithm,multi-channel maximum posterior elevation The reconstruction algorithm,the maximum posterior elevation estimation algorithm based on TV model and the elevation reconstruction based on multi-label graph cut are studied.And analyze and compare each algorithm through experiment.(2)A maximum posterior elevation reconstruction method combined with quality map guidance is proposed.This method introduces the path tracking strategy in single-channel InSAR technology into multiple channels,adopts an elevation reconstruction model based on recursive estimation for elevation estimation,and on this basis further introduces edge detection technology and optimized elevation model pairing algorithm Make improvements.(3)An extended Kalman filter multi-channel InSAR elevation reconstruction method combined with edge detection is proposed.This method uses the maximum likelihood elevation inversion algorithm to obtain the rough elevation of the terrain and filter it,and then extracts the discontinuous boundary of the terrain through the sobel operator,and uses the extended Kalman filter phase unwrapping algorithm for elevation reconstruction in the continuous area.The discontinuous boundary region uses the maximum posterior algorithm based on total variation(TV)for elevation reconstruction.This method combines the advantages of single-channel and multi-channel InSAR elevation reconstruction techniques to improve the robustness of the algorithm.