普宁市地面沉降的SBAS技术监测应用研究

InSAR(Interferometric Synthetic Aperture Radar,InSAR)技术是随着合成孔径雷达发展起来的一种雷达干涉测量新技术,它可获得地表目标点的精确三维空间位置以及细微形变信息。基于雷达干涉测量发展的短基线(Small BAseline Subset,SBAS)干涉测量,可对缓慢地表形变进行高精度的监测。本文以广东省普宁市为实验区,选用2007~2010年间共10景ALOS/PALSAR数据,采用SBAS技术获取了该地区的形变时间序列和平均沉降速率,结果表明普宁市区存在多个严重的沉降漏斗,年最大沉降速率达15cm/a。利用观测时段内两期的水准点观测资料对SBAS时序结果进行验证,对比结果发现两者较差最大为46mm,最小为21mm,表明SBAS技术进行地面沉降监测的可靠性和有效性。

SBAS Technology Application to Monitor land Subsidence in Puning

InSAR（Interferometric Synthetic Aperture Radar,InSAR）technology developed along with synthetic aperture radar is a new radar interferometry technology which can obtain the accurate three-dimensional position of surface targets and small deformation information.SBAS（Small Baseline Subset,SBAS）interferometry developed from the basis of radar interferometry,can monitor the slow surface deformation with high precision.In this paper,we use SBAS technology to process 10 ALOS/PALSAR data between 2007 and 2010in Puning City of Guangdong Province which is chosen as the experimental area,and get the deformation time series and average sedimentation rate in the region.The results demonstrate that there are several serious subsidence funnel in Puning city and the highest sedimentation rate is up to 15cm/a.Contrasting the SBAS time series with two periods of leveling point observation data in observation period,the results show that the maximum difference is 46 mm and the minimum difference is 21 mm.It indicates that using SBAS technology to monitor the surface deformation is reliable and effective.