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基于高相干点目标反演缓慢地表形变已成为当前DInSAR技术的研究热点.本文通过融合PS方法和相干目标法优点,采用小基线DInSAR技术提取城市地表形变场,并重点分析了地表线性形变的反演.在此基础上,以太原市为研究区,利用23景ENVISAT ASAR影像,提取了该市2003～2009年的地表形变场.研究结果表明:(1)在该阶段太原市存在有4个明显的沉降中心,即下元、吴家堡、小店、孙家寨,其中最大沉降中心孙家寨的平均沉降速率为-77.28 mm/a;(2)老沉降中心万柏林沉降趋于缓和,北部地区沉降停止,甚至出现反弹;(3)沉降中心的变化说明太原市采取的“关井压采”控沉措施取得初步成效;(4)水准数据验证了监测结果,精度达到2.90 mm,表明小基线DInSAR技术可满足城市地表形变监测需求.
The inversion of slow surface deformation based on high coherence point target has become a hot research topic in current DInSAR technology.Based on the merging PS method and the advantages of coherent target method, this paper uses the small baseline DInSAR technique to extract the urban surface deformation field and focuses on the analysis of the inverse of the surface linear deformation Based on this, taking Taiyuan city as the research area, this paper extracted the surface deformation field of the city from 2003 to 2009 using the ENVISAT ASAR image of 23. The results show that: (1) There are 4 The obvious subsidence centers are Xiajian, Wujiabao, Xiaodian and Sunjiazhai, and the average subsidence rate of Sunjiazhai, the largest subsidence center, is -77.28 mm / a. (2) The subsidence of Wanbailin settlement of the old subsidence center tends to be alleviated (3) The change of settlement center shows that the “shut-in pressure mining” control measures adopted by Taiyuan City have achieved initial success; (4) The leveling data verify the monitoring results and the accuracy reaches 2.90 mm, indicating that the small baseline DInSAR technology can meet the needs of urban surface deformation monitoring.