Insar And Its Applied Research In Geodesy And Space Geodynamics

Synthetic Aperture Radar interferometry (InSAR) is the technology which uses the phase information derived from complex Synthetic Aperture Radar (SAR) data to get precise three-dimensional information of the earth surface.In this paper, the development history and present study status of InSAR are firstly introduced. The basic imaging theory, signal model and its proceeding method of SAR are then analyzed. The resource of SAR positioning are listed, and its precision of positioning are' analyzed. Through the study of spaceborne repeat pass InSAR system, the basic theory and data processing method of InSAR are expatiated. By summing up many other methods, a utility data processor are put forward. According to the mostly tache of InSAR algorithm, Phase unwrapping, Baseline evaluation and DEM reconstruction are discussed in detail. In the view of system decorrelation, the restrict relation of InSAR and its baseline attitudes are studied. The main error resources of InSAR and its influence on InSAR are also studied. The influence of earth rotation and atmosphere domino effect on InSAR are discussed in detail.The potentiality and advantage of crust deformation measurement by using Differential-InSAR are studied deeply. The theory and method which we obtain ground deformations by D-InSAR technology are brought forward in this paper. Its precision can reach centimeter level when we use this method to measure the earthquake deformation and ground subsiding. The applications of InSAR to geodesy and space - geodymanics are highlighted discussed. The mutual relation between InSAR and other spacial geodesy technologiesaer are also analyzed. In view of theoretics and applications, it is illuminated that InSAR can be a very useful tool when used to space geodymanics study. The new assume of GPS/VLBI/SLR/InSAR combination technology are brought forward, its application to studying the plate motion and its changes of cubage and figure of the earth are discussed, and three different mathematics models of crust deformation are founded according to their characteristics of crust deformation. The application to the geostationary satellite positioning system with two satellites are analyzed in this paper. It is indicated that InSAR will be a new means to improve the precision of geostationary satellite positioning system with two satellites.