Based on X-band TERRASAR-X images from 2010 to 2016 and C-band RADARSAT-2 images from 2010 to 2014,ver-tical land surface deformation along the Beijing-Tianjin high-speed railway(Beijing section)was retrieved.Results showed consis-tency with leveling measurement with vertical deformation rate smaller than the leveling measurements for around 2.5 mm/a.The vertical deformation derived from both TERRASAR-X and RADARSAT-2 images was more accurate than measurements by TERRASAR-X which has error of 20.0 mm/a and the RADASAT-2 which has error of 10.6 mm/a,indicating the multi-platform method can better represent the surface deformation.Slope analysis was conducted based on the vertical deformation.Results showed that the slope was within the maximum allowed slope for secure operation.%基于2010—2016年X波段TERRASAR-X影像和2010—2014年C波段RADARSAT-2影像,利用PS-InSAR算法联合反演了京津高铁北京段沿线的地表垂向形变速率;选择距离水准点最近的 PS点与水准点监测结果进行比较分析,发现相比单一平台反演结果,联合解算结果与水准点监测的平均沉降速率更为接近,平均误差为2.5 mm/a,远低于 TERRASAR-X数据反演的20.0 mm/a和RADASAT-2数据的10.6 mm/a,说明联合解算的垂向形变能够更加真实地反映地面沉降特征.根据垂向形变对京津高铁北京段沿线地表形变进行剖面分析和坡度分析,结果显示目前高铁沿线形变仍在安全运行允许形变范围之内.
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