The Research Of Coregistration In InSAR Processing

Interferometric Synthetic Aperture Radar(InSAR) is one of the most important part in the field of Synthetic Aperture Radar(SAR). Using this technology, you can get radar image of high precision day/night and all weather. And it is recognized as the most efficient technology to achieve digital elevation model(DEM).As one of the basic and important procedures in InSAR processing, the accuracy of coregistration will affect the following procedures directly. Nowadays, coregistration has been widely used in various fields including radar images processing. And it has been an absolutely necessary part in all the research fields.The dissertation introduces the basic principle of InSAR briefly, and analyzes the characteristicits as well as the format of Single Looking Complex(SLC), and sum up the methods of coregistration in common use today. Based on this, we decided to use the method of coregistration that has three step. Using two SLC radar image of SanXia, we experiment with this new methods of coregistration, so as to study the small change of the earth's surface. Firstly, we use the parameters of satellite orbit to obtain 30 pixels precision of coregistration; then, we use the method of correlation to achieve pixels precision; finally we use correlation registration method to obtain sub-pixel precison. After image coregistration, interferogram can be obtained by resampling the slave images. The result of experiment has proved the validity of the method.