Deformation monitoring is an important support for the safe operation of dams.Aiming at the problem that SAR satel-lite cannot use traditional digital terrain to obtain the elevation phase of dam side in arch dam deformation monitoring,this paper proposed a new arch dam deformation monitoring method by high-resolution SAR satellite combined with 3D point cloud.In this method,the distance-Doppler model was used to transform the 3D point cloud of a dam towards the radar direction,and the inter-ference baseline information was used to accurately simulate the dam heights.Finally,the dam horizontal deformation projection to sight direction was carried out to realize the deformation field extraction of the arch dam with millimeter accuracy.The engineering application showed that the observed horizontal deformation accuracy of the dam body can reach about 4 mm.With the improve-ment of the resolution and the increase of the number of SAR satellites,this method is expected to achieve higher frequency and higher precision dam deformation monitoring.
关键词
星载InSAR/变形监测/拱坝/Lidar/差分干涉测量
Key words
space borne SAR/deformation monitoring/arch dam/Lidar/differential interferometry
维普
万方数据