高分辨率PSI上海市沉降探测及分析  

Detection and analysis on subsidence of Shanghai with high resolution PSI technique

作　　者：聂运菊[1,2,3] 刘国祥[2] 石金峰[1] 于冰[2] 

机构地区：[1]辽宁工程技术大学测绘与地理科学学院,辽宁阜新123000 [2]西南交通大学地球科学与环境工程学院,成都610031 [3]东华理工大学测绘工程学院,江西抚州344000

出　　处：《测绘科学》2013年第3期73-76,共4页Science of Surveying and Mapping

基　　金：国家自然科学基金项目(41074005;40774004);教育部新世纪优秀人才支持计划(NCET-08-0822)

摘　　要：本文在改进的永久散射体(PS)探测方法基础上,应用高分辨率永久散射体雷达干涉(PSI)探测上海市地表沉降,并对沉降原因进行了详细分析。实验选取2008年4月至2010年1月间,由德国卫星TerraSAR-X(TSX)所获取的18幅X波段(波长为3.1 cm)高分辨率SAR影像为数据源,进行PS探测、PSI建模、形变提取和分析。实验结果表明,改进的PS探测方法探测出的PS点是合理和可靠的,且高分辨率SAR影像对地面硬目标识别能力较强,显著提高了PS点的密度和覆盖范围。沉降探测结果显示,最大相对沉降速率达30 mm/yr,平均沉降速率为11.5 mm/yr。The subsidence in Shanghai was detected using the Persistent Scatterer （PS） Interferometric Synthetic Aperture Radar （InSAR） technique with high resolution （HR） imagery, which was based on an improved algorithm for PS detection. The causes of subsidence were also analyzed. This investigation aimed to explore and provide an effective technology for monitoring subsidence in ur- ban areas and on engineering structures. The experiments of PS detection, PSI modeling, deformation extraction and analysis were per- formed with data sources of 18 HR X-band （wavelength of 3.1 cm） SAR images （covering 54× 31 km2） , which were collected by the radar sensor onboard the German satellite TerraSAR-X （TSX） from April 2008 to January 2010. The experimental results demon- strated that the PS points detected by the improved method were accurate and reliable. The PSs＇ density and coverage could be in- creased dramatically due to the unique characteristics of the HR TSX SAR imagery in distinguishing the hard objects. The accuracy and reliability of the deformation measurements derived by PSI could be improved significantly. The maximum relative subsidence rate in the study area was as high as 30 mm/yr and the averaged subsidence rate was 11.52 mm/yr.

关 键 词：高分辨率 永久散射体 TerraSAR—X影像 沉降探测 

分 类 号：P237.9[天文地球—摄影测量与遥感] P258[天文地球—测绘科学与技术]