基于SAR干涉点目标分析技术的城市地表形变监测  

Monitoring Urban Subsidence Based on SAR Interferometric Point Target Analysis

作　　者：张永红[1] 张继贤[1] 龚文瑜[1] LU Z 

机构地区：[1]中国测绘科学研究院,北京100039 [2]U.S. Geological Survey, Cascades Volcano Observatory, Vancouver WA98683, USA

出　　处：《测绘学报》2009年第6期482-487,493,共7页Acta Geodaetica et Cartographica Sinica

基　　金：国家973计划(2006CB701303);国家自然科学基金(40571104);武汉大学测绘遥感信息工程国家重点实验室开放基金

摘　　要：通过深入研究干涉点目标的相位模型,提出基于空间搜索的邻近点目标干涉相位差解缠方法,用以计算点目标的地形残差和线性形变,以及分离点目标大气延迟相位和非线性形变相位的时空域滤波方法,解决干涉点目标分析中的关键问题。最后,以苏州地区地表沉降监测为应用试验,利用形成的SAR干涉点目标形变信息提取技术,获取苏州市区1992—2002年间的地表沉降信息。研究结果与已有文献记录保持比较好的一致性,证明SAR干涉点目标技术完全可以发展成为应用于城市地表形变监测的实用化技术。Interferometric point target analysis （IPTA） is one of the latest developments in radar interferometric processing. It is achieved by analysis of the interferometric phases of some individual point targets, which ore discrete and present temporarily stable backscattering characteristics, in long temporal series of interferometric SAR images. This paper analyzes the interferometric phase model of point targets, and then addresses two key issues within IPTAprocess. Firstly, a spatial searching method is proposed to unwrap the interferometric phase difference between two neighboring point targets. The height residual error and linear deformation rate of each point target con then be calculated, when o global reference point with known height correction and deformation history is chosen. Secondly, a spatial-temporal filtering scheme is proposed to further separate the atmosphere phase and nonlinear deformation phase from the residual interferometric phase. Finally, an experiment of the developed IPTA methodology is conducted over Suzhou urban area. Totally 38 ERS-1/2 SAR scenes are analyzed, and the deformation information over 354：6 point targets in the time span of 1992 2002 are generated. The IPTA-derived deformation shows very good agreement with the published result, which demonstrates that the IPTA technique con be developed into an operational tool to map the ground subsidence over urban area.

关 键 词：合成孔径雷达 点目标 差分干涉测量 形变监测 城市地面沉降 

分 类 号：P231[天文地球—摄影测量与遥感]