Ground based Synthetic Aperture Radar Interferometry (GBInSAR) can set the right baseline according to the monitoring area, which is more freedom and convenient maneuverability and has been used on deformation monitoring of buildings, Bridges, etc. However, in the process of GBInSAR monitoring, atmospheric disturbances is a key factor affected the accuracy of the monitoring. According to the statistical characteristics in monitoring area images, the paper selected the Permanent Scatters (PS) points, established Delaunay triangulation and acquired the atmospheric correction of GBInSAR monitoring data for by linear interpolation. As the same time, the paper used the fixed point method to calculate the atmospheric disturbance. Then, the paper compared the both methods’ corrected results with high precision vertical data. The results showed that the PS method was better than the fixed point method. The PS method can better correct the atmospheric disturbances elements in the GBInSAR monitoring sequence, which provided reference value for further popularization and application of GBInSAR.
Precise topographical information has a very important role in geology, hydrology, natural resources survey and deformation monitoring. The extracting DEM technology based on synthetic aperture radar interferometry (InSAR) obtains the three-dimensional elevation of the target area through the phase information of the radar image data. The technology has large-scale, high-precision, all-weather features. By changing track in the location of the ground radar system up and down, it can form spatial baseline. Then we can achieve the DEM of the target area by acquiring image data from different angles. Three-dimensional laser scanning technology can quickly, efficiently and accurately obtain DEM of target area, which can verify the accuracy of DEM extracted by GBInSAR. But research on GBInSAR in extracting DEM of the target area is a little. For lack of theory and lower accuracy problems in extracting DEM based on GBInSAR now, this article conducted research and analysis on its principle deeply. The article extracted the DEM of the target area, combined with GBInSAR data. Then it compared the DEM obtained by GBInSAR with the DEM obtained by three-dimensional laser scan data and made statistical analysis and normal distribution test. The results showed the DEM obtained by GBInSAR was broadly consistent with the DEM obtained by three-dimensional laser scanning. And its accuracy is high. The difference of both DEM approximately obeys normal distribution. It indicated that extracting the DEM of target area based on GBInSAR is feasible and provided the foundation for the promotion and application of GBInSAR.
Only the displacement along the radar line of sight can be got in Ground Based Synthetic Aperture Radar (GBSAR). In order to extract high-precision three-dimensional displacement field of research area, in this article, we research deeply the method which integrates both three-dimensional laser scanning and GBSAR techniques. It is proved that high precision three-dimensional displacement field information can be extracted with this method through analyzing case and assessing the accuracy of three-dimensional displacement field. The method has a good practical value.