利用GPS位移数据校正2011日本Tohoku地震的InSAR形变场  

Calibration of the InSAR Coseismic Deformation of 2011 Tohoku Earthquake by GPS ata

作　　者：卢娟[1,2] 伍吉仓[1] 陈艳玲[2] 

机构地区：[1]同济大学测绘与地理信息学院,上海市四平路1239号200092 [2]中国科学院上海天文台,上海市南丹路80号200030

出　　处：《大地测量与地球动力学》2017年第7期726-731,共6页Journal of Geodesy and Geodynamics

基　　金：国家973计划(2013CB733304);国家自然科学基金(41174024)~~

摘　　要：轨道误差是InSAR数据处理中的一个重要因素,对从最初的图像配准到最后的高程值或形变值图像的生成都有着重要影响。含有误差的轨道参数造成基线误差以残差条纹的形式存在于干涉图中。本文利用4个条带的61景PALSAR升轨数据,通过InSAR干涉测量得到覆盖2011日本Tohoku地震的雷达视线向的地表同震位移场。通过联合GPS同震位移数据,采用二次多项式曲面拟合的方法去除InSAR同震形变数据中的卫星轨道误差,并分析雷达入射角变化对轨道误差去除的影响。对干涉图中拟合残差进行分析,改正后的InSAR同震形变场精度得到较大提高。Orbital state vectors are important parameters that play crucial roles in the processing of In- SAR, from the original offset of coarse registration to the accurate generation of the ultimate DEM or deformation measurements. Errors in the baseline are caused by errors in the orbital state vectors, which present as phase errors in the interferogram. We map the coseimic deformation of the 2011 To- hoku earthquake with data from four ascending ALOS/PALSAR tracks and GPS coseimic displace- ments that cover most of northeastern Japan. The quadratic polynomial approximation is proposed to eliminate orbital errors from the interferogram, and we analyze the effects of incidence angle. The precision of corrected coseimie deformation measured by InSAR is verified by analyzing the residual deformation in the interferogram.

关 键 词：Tohoku地震 INSAR GPS 轨道误差 雷达入射角 

分 类 号：P315[天文地球—地震学]