相位萃取技术在InSAR小数据集上的应用  

The application of the phase reconstruction on small InSAR datasets

作　　者：张奎[1] 汪慧[1] 宋瑞庆[2] 盛耀彬[3] 

机构地区：[1]重庆大学通信工程学院,重庆400044 [2]中国地震局地震预测研究所地震预测重点实验室,北京100036 [3]西南大学地理科学学院,重庆400715

出　　处：《遥感学报》2017年第4期645-652,共8页NATIONAL REMOTE SENSING BULLETIN

基　　金：国家自然科学基金(编号:41404027;41461164004);国家国际科技合作专项项目(编号:2105DFR21100)~~

摘　　要：相位萃取技术可最小化多基线InSAR处理中干涉像对的去相关噪声,已成为雷达干涉测量研究领域中热点技术之一。本文首先设计并实现了一套专门针对小数据集的基于相位萃取技术的多基线InSAR处理流程。整个流程分为两大模块。第一个模块为称为预处理模块,通过图像配准、地形相位移除等操作生成相位萃取技术所需的零基线SAR图像堆栈。第二个模块首先基于多视像元生成相干矩阵,并且在此基础上完成相位萃取操作。然后,利用小基线集技术的思想在萃取相位上分离出各相位稳定点上的形变情况。为了保证结果可靠性,在这一模块中还加入了大气相位预估与移除的步骤。最后,该流程被应用到了5景拍摄于太原地区的PALSAR图像上。实验结果表明,相位萃取技术在小数据集情况下仍然能够有效提升数据的相干性,这有利于多基线InSAR输出结果密度的提升。Multi-baseline InSAR techniques have demonstrated their great potential in topographic mapping and ground surface deforma- tion monitoring. In order to minimize the decorrelation noise between stacked SAR images in multi-baseline InSAR processes, the phase re- construction technique has been developed recently and has become one of the hotspot techniques in radar interferometry. Due to budget limitations and unstable SAR image acquisition frequency, a lot of multi-baseline InSAR applications have to be carried out based on small image datasets. Researchers have made every endeavor to address this problem, some targeted multi-baseline InSAR processing strategies have been therefore developed. Unfortunately, there are few literatures discussing the application of phase reconstruction to small image datasets at this stage. This paper aims to evaluate the effectiveness of the phase reconstruction technique on a small SAR image datasets. A targeted multi-baseline InSAR processing scheme was designed and applied to real data. The main idea of phase reconstruction technique is to reform phase observations along a SAR stack by taking advantage of a maximum likelihood estimator which is defined on the coherence matrix estimated from each target. The proposed multi-baseline InSAR processing scheme is divided into two modules. The first one is named as ＂pre-processing module＂, which generates the zero-baseline SAR image stack required by the phase reconstruction technique via a series of operations including image coregistration, topographic phase component removal, and so on. The second one firstly constructs co- herence matrices based on multilooked pixels, thereby conducting phase reconstruction operations. Subsequently, it isolates ground surface deformation signals based on reconstructed phase observations by taking advantage of the small baseline subset technique. Noted that an at- mospheric disturbances estimation and removal step was involved in this module in order to assure the reliability of the output measur

关 键 词：相位萃取 多基线INSAR 小数据集 相干性 合成孔径雷达 

分 类 号：TN957.52[电子电信—信号与信息处理]