Repeat-Pass Interferometry With Airborne Synthetic Aperture Radar

Nowadays acquiring three-dimensional Digital Elevation Model (DEM) by Interferometric Synthetic Aperture Radar (In-SAR) is a focus of research work in the remote areas. And In-SAR has the following advantages: large coverage, high spatial resolution, high elevation accuracy, and capability to work in all day and under all whether conditions. This dissertation discusses the principles of SAR, imaging conditions, influencing factors and processing methods of In-SAR, and presents new coregistration method and phase noise filtering method.Accurate coregistration is the base of a successful interferometry SAR imaging. After several conventional coregistration methods were reviewed, a new global coregistration method based on local coregistration is presented, and its effectiveness and feasibility of coregistration is tested by airborne SAR data.A good interferogram is a prerequisite of getting a good DEM. Hence proper phase noise filtering is needed to be done before phase unwrapping. A new adapting phase noise filtering method based on edge detection ,is put forward and tested withed real data. This method is proved to be feasible and indeed improves the quality of interferogram.Finally, this dissertation processes the repeat-pass airborne SAR data of our institute. And the first China DEM from repeat-pass airborne SAR, which mostly tallies with the real topographic map, is generated. And some suggestions for future works are put forward.