顾及极化最优的时序双极化InSAR形变监测方法  

A time-series dual-polarization InSAR method based on polarimetric optimization for monitoring deformation

作　　者：桂阳归 汪长城[1] 卢丽君[2] 沈鹏 GUI Yanggui;WANG Changcheng;LU Lijun;SHEN Peng(School of Geosciences and Info-Physics,Central South University,Changsha 410083,China;Chinese Academy of Surveying and Mapping,Beijing 100036,China)

机构地区：[1]中南大学地球科学与信息物理学院,长沙410083 [2]中国测绘科学研究院,北京100036

出　　处：《测绘科学》2021年第12期75-82,共8页Science of Surveying and Mapping

基　　金：国家自然科学基金项目(41671356)。

摘　　要：为了进一步提高InSAR的形变监测能力,在传统PSI技术和DS-InSAR技术的基础上,该文发展了一种顾及极化通道最优的时序InSAR形变监测方法。与传统时序方法相比,该方法在提高测量点密度的同时有效改善相位质量,并发现极化优化后的影像在城区能抑制一定程度的旁瓣效应,有利于后续同质区识别。基于此方法,该文以西安为例,采用12景PALSAR-2双极化影像进行地表时序形变反演。结合降水等数据,分析了由于过度抽取地下水叠加下伏构造断裂活动引起的西安地表沉降。In order to further improve the deformation monitoring ability of InSAR,on the basis of PSI and DS-InSAR,a new method of time-series InSAR deformation monitoring is developed based on polarization optimization.Compared with the traditional deformation monitoring method,new method can effectively improve the measurement point density and phase quality.Moreover,we find that the optimal polarization can effectively suppress the sidelobe in urban area,which is conducive to the homogeneous region identification.In this paper,taking Xi’an as an example,based on the new method,12 Dual-polarization PALSAR-2 images are used for deformation inversion.Based on the data of precipitation,the surface subsidence of Xi’an caused by over extraction of groundwater and the activity of underlying structural faults is analyzed.

关 键 词：极化优化 永久散射体 分布式散射体 地裂缝 

分 类 号：P237[天文地球—摄影测量与遥感]