PS-InSAR技术在地铁施工区域沉降高精度监测中的应用研究

Application of PS-InSAR Technology in High Precision Monitoring of Settlement in Metro Construction Area

基于52景Sentinel-1A影像数据,采用PS-InSAR方法监测南京市地铁7号线施工区域2019年1月17日~2020年12月1日的地面沉降,利用水准和GNSS地面观测数据进行精度评定,监测结果的均方根误差为3.1 mm。分析南京市地铁7号线施工区域地表形变的时空特征,通过建立合理的PS-InSAR建筑物稳定性评估体系,实现了建筑物异常形变的快速智能排查。

Based on PS-InSAR technology,we used 52 scenes of Sentinel-1A image data to monitor the ground subsidence in the construction area of Nanjing Metro Line 7 from January 17,2019 to December 1,2020.The accuracy was evaluated by using the level and GNSS ground observation data,and the root-mean-square error of the monitoring results was 3.1 mm.The temporal and spatial characteristics of surface deformation in the construction area of Nanjing Metro Line 7 are analyzed,and a reasonable PS-InSAR building stability evaluation system is established to realize rapid intelligent investigation of abnormal building deformation.