基于短基线集InSAR技术监测北京地区地表形变

Monitoring Surface Deformation in Beijing Area Based onSmall Baseline InSAR Technique

短基线集差分干涉测量(SBAS-InSAR)技术是在传统DInSAR技术基础上发展起来的一种更高精度的长时序变形监测方法,可有效地克服传统DInSAR在微小形变监测中受时空去相干以及大气效应等因素的影响,已成为当前InSAR技术的研究热点。本文利用ENVISAT ASAR传感器获取的22幅C波段影像数据,基于短基线集差分干涉测量技术对北京地区地表沉降进行监测,获取每个观测时刻的形变累积量,得到研究区的形变序列图,进而分析了该区域地表沉降特征,结合地质环境监测成果,初步讨论了2003至2010年间北京地区区域地表沉降成因。

Small baseline differential SAR interferograms(SBAS-InSAR)is a more accurate long time sequence deformation monitoring method developed on the basis of traditional DInSAR technology.It can effectively overcome the influence of spatiotemporal decoherence and atmospheric effect of traditional DInSAR in small deformation monitoring,and has become a research focus of current InSAR technology.Using ENVISAT ASAR 22 C band images data of sensors based on small baseline differential SAR interferograms measuring technology to monitor the ground deformation in the Beijing area,for each observation point cumulative deformation,get the deformation sequence diagram of research area,and then analyzes the regional surface subsidence characteristics between 2003 and 2010 in Beijing area.The reasons of the deformation are preliminary discussed by combining with the geological environment.