工矿区地表沉陷D-InSAR监测试验研究

基于差分合成孔径雷达干涉测量(D-InSAR)中相位构成因素的分析,选择中国东部典型工矿区(唐山市及开滦矿区)为试验区进行了矿区地表沉陷D-InSAR监测试验研究.利用该地区1997-1998年两个时相获取的5景ERS1/2卫星SAR单视复数据(SLC),分别采用“2轨法”和“3轨法”进行差分干涉处理,得到了间隔时间超过半年的地下采矿及采水引起的雷达视线向(LOS)形变图.通过将LOS形变图转换成地表下沉分量,分析了试验区沉陷的扩展及演变过程.在此基础上,对D-InSAR技术中存在的时间去相干、空间去相干等误差因素进行了分析和讨论.试验表明:作为数字矿山的关键技术之一,可以利用多时相D-InS...

Experimental Study on Surface Subsidence Monitoring with D-InSAR in Mining Area

Based on the quantitative analysis of phase compositions and its contributions to D-InSAR(Difference-Interferometric Synthetic Aperture Radar) monitoring, Tangshan City and Kailuan Mining Area, as the typical mining/industrial area in Eastern China, are selected as the experimental district for the application of D-InSAR to the monitoring and the dynamical analysis of surface subsidence. The 5-scene ERS1/2 SLC SAR data acquired from two temporal phases in 1997 and 1998 being selected as experimental data, the deformation in the line of sight was extracted separately by way of "2 pass" and "3 pass D InSAR By transforming the LOS deformation into vertical subsidence, the evolution of surface subsidence caused by underground coal mining and underground water exploitation was analyzed. The temporal decorrelation,spatial decorrelation and other error sources in D-InSAR monitoring in mining area were analyzed and discussed. As one of the key technologies for digital mine, it was suggested that the multi-temporal and the Connor Reflectors(or Plane Reflectors) could be applied in D-InSAR that is being used for the long-term surface subsidence monitoring in mining area.