The thesis adopts time series analysis of the SAR images in 10 phases up to 4-year span of Yancheng city area in Jiangsu province, by selecting the SAR image acquired on September 3, 2005 as the main image and the rest of the SAR images as vice images, interferometric processings are carried out and 9 interferograms consisting of the terrain and the deformation information are extracted. By dealing with the 9 difference interferograms with PS technology, terrain feature spatial distribution characteristics with stable electromagnetic reflecting characteristics are successfully ascertained. After temporal and spatial analysis of the 9 unwrapping interferograms，DEM error, atmospheric delay error in the main image and the vice image are obtained, thus the PS-point nonlinear distortion of the ground is extracted. Then by integrating analysis of ground deformation direction, reference datum, floor deformation positiveness and negativeness three aspects, the surface subsidence distributed situation in time and space of Yancheng city area are discovered.
展开▼
