Study On Model And Methods Of Extracting Deformation Combinating TerraSAR-X And Palsar Image

The development of human society and the Earth's own motion result in land subsidence which usually leads to huge losses of social economic or radically change in Earth's topography during a long time.Mankind gradually realised the dangers of land subsidence with the advancement of technology. By analyzing the causes of land subsidence pelple could stop the coming tragedies based on the preventive measures they adopt. Normally, area of land subsidence is large, so how to quickly and accurately obtain the deformation informations of land subsidence information in order to provide scientific support for government is becoming more important.Synthetic aperture radar interferometry (InSAR) appeared in 1990's. Compared with the conventional regional subsidence monitoring technology (such as leveling and Global Satellite Positioning technology, GPS), DInSAR could get tiny ground deformation information of larger region dynamically, highly efficient and continuously. Emergence of new issues often plays a role in promoting scientific and technological progress. After the technological bottleneck (such as spatio-temporal decorrelation and atmospheric delay) of DInSAR, scientists have put forward the concept of permanent scatterers, and successfully applied to the land subsidence monitoring.In this paper, Real Aperture Radar(RAR), Synthetic Aperture Radar(SAR), SAR interferometry(InSAR) and differential InSAR(DInSAR) are expounded in detail. Two-pass DInSAR method is employed to extract the deforamtion informations based on TerraSAR X-band image and PALSAR L-band image of the same region respectively, and the results of different satellite sensors are compared and analysed.Permanent Scatterer DInSAR (PS-DInSAR) owns the capacity of reducing the impacts of Spatio-temporal decorrelation and atmospheric delay. In this thesis, a detailed description of PS-DInSAR technique is given, and a model of combinating multi-sensor to solve deformation in three-dimensional without ground reference point (GRP) is established. After the improved permanent scatterer interferometric(PSI) of TerraSAR X-band and PALSAR L-band data with same region, an experiment using simplified model of combinating two satellite sensors without GRP is perfomed to extract the informations of vertical and horizontal deformation of earth surface, which are solved by least square method. At last, verify the reliability of the model by comparing the vertical deformation with leveling data.