Research on Using WSInSAR to Monitor and Analyze Deformation Wenchuan Earthquake

Abstract

Wide Swath InSAR is known as WSInSAR which can use ScanSAR mode of SAR satellites to get geometrical information of the earth’s surface.ScanSAR’s character is that synthetic aperture time is shared by circumjacent sub_swaths and azimuth resolution is reduced so that large area deformation monitoring for earthquakes is realized.For imaging principle ScanSAR and IM mode are different, process of interferometry also have a lot of dissimilitudes such as coherence,coregistering,correction of atmosphere effects and geoid undulation. In order to make use of ScanSAR data to get wider deformation field,key techniques of ScanSAR interferometry are studied and analyzed in the paper.In the end, 405km×405km deformation fields of Wenchuan earthquake are gained by using ENVISAT ScanSAR data, With the application to ScanSAR interferometry in Wenchuan earthquake, it is significant for earth science research such as large earthquakes and crustal motion.