The Research On Synthetic Aperture Radar Interferometry Imaging Technique Of Satellite

Interferometric Synthetic Aperture Radar(InSAR) image technique is a new radar image technique developed from Synthetic Aperture Radar (SAR).Carried forward the merit of SAR, InSAR can create high resolution DEM and accomplish change detection, such as slow-moving targets or subtle shift of the earth's surface. It can be applied to many areas of military and civil.The history developing of InSAR is reviewed, and the actual state of InSAR is depicted briefly in the thesis. The basic principle of InSAR imaging technique is introduced in the thesis firstly. Then, the system model of InSAR is analyzed. The flow of data processing for InSAR is discussed, and the differential InSAR is introduced in the thesis.The InSAR complex images registration methods of correlation matching and spectral maximum matching are discussed in the thesis, and a new method of InSAR complex images registration using correlation matching combined with spectral maximum matching is presented. Compared with other method, the merit of this new method is less time spending on calculating for complex images registration on the condition that is up to complex images registration precision, and the results of experiment show that this new method was resultful. The error sources of complex images registration is analyzed, and the relation between the correlation coefficient, the differential of interferometric phase and the PDF.The reasons to form the horizontal ground effect of interference pattern in InSAR imaging technique were discussed in this thesis, and the common methods of eliminating the horizontal ground effect were explained suitably. One method was to multiply the phase signal of interference pattern by a complex exponent changed with the time, and the other one was moving the center of frequency spectral to the zero frequency spectral. A new algorithm to obtain a precision frequency based on linearity interpolation technique was advanced, and the results of experiment show that the algorithm was effective.By analyzing the noise sources and the characteristic of interferogram phase, the average-value-filter and the median-value-filter are employed usually in interferogram phase filter. An algorithm of interferometric phase filter of InSAR based on wavelet analysis filter algorithm combined with median filter algorithm is advanced to...