Three-dimensional Imaging Technique Of Synthetic Aperture Radar (sar) Study

Interferometric Synthetic Aperture Radar (InSAR) is an advanced space observation technique developed in the last two decades or so. It can be used to extract 3D information of the earth surface or detect the deformation extent of the earth surface from the phase information of SAR data. InSAR has quite a lot of advantages compared with traditional remote sensing technique. For example, it can work without the limitation of time or weather, and it can observe a huge area efficiently. A new ocean altimeter combining the traditional altimeter and interferometric technique is proposed in this paper. It can satisfy the requirement of observing the area of high latitude and wide-swatch, which overcomes the deficiency of traditional altimeter. Therefore, the altimeter based on Cross-Track Interferometry (XTI) is one of the most potential and expectant new technology at the present time.Due to increasing demand of ocean measurement, studying ocean hypsometrical is becoming important and significant. This dissertation applies XTI-InSAR technique to ocean altimeter, and uses Monte Carlo method to simulate random rough ocean surface with P-M spectral density function.This dissertation provides the process of signal processing for spaceborne cross-track (repeat-pass) interferometry, with emphasis on the key techniques of signal processing, such as flat effect removing and phase unwrapping. We choose direct solution for flat phase removing and precondition technique for phase unwrapping. Finally, a random rough ocean surface is simulated and analyzed by our simulation program, and numerical DEM result of rough ocean surface is demonstrated at the end of this dissertation.