星载宽幅雷达干涉监测大范围地震形变技术研究

Study on ScanSAR Interferometry for Monitoring Large Scale Earthquake

宽幅雷达成像模式可监测大范围地震形变,但该模式与条带成像模式存在差异。针对这些差异,深入分析了图像拼接、大气效应校正和大地水准面差距改正等方面的关键技术,提出了基于配准加权的拼接方法和基于EGM96的大地水准面差距改正方法,分析了适应于宽幅SAR干涉的大气校正模型。在此基础上,对ENVISAT卫星宽幅数据干涉测量成果进行了校正,并分析了汶川地震和于田地震的宽域形变场。

ScanSAR mode can be used to monitor deformation of large area,but this mode has some difference with strip mode.Aiming to study those differences,following ScanSAR mode data interferometry processing have been analyzed such as strip mosaicing,coregistering,correction of atmosphere effects and geoid undulation.At the same time,methods overcoming corresponding problems have been put forward.In this paper,ENVISAT WSS mode interferograms of Wenchuan and Yutian earthquake are corrected,and the deformation fields have been analyzed.With the application to ScanSAR interferometry in Wenchuan and Yutian earthquake,it is significant for scientific research on large earthquakes and crust motion.