Geometric Rectification of High Resolution Spaceborne SAR Image Based on RPC Model
基于RPC模型的高分辨率SAR影像正射纠正

As active remote sensing sensor, spaceborne SyntheticApertureRadar(SAR) withmerits ofbroad range mi- age, all-weatherwork tmi e and strong penetrationwhich iswidely used inmapping, geology, hydrology, agriculture, for- estry and so on, is an mi portantpartof theModern radar technology. The application ofSAR needs to know the exact lo- cation of the corresponding space informationwhichmustbe carried out on the geometric rectification ofSAR mi age pro- cessing geometric correction, elmi ination various geometric deformation exist in the SAR mi ages. RPCmodel is amathematical sense of the mi aging geometrymode,l which is independentof the sensorand platform. Themodel establish the relationship between the ground coordinates of any mi age and the corresponding geology coordi- nates. A lotofwork hasbeen done onRPCmodel foroptical sensorbymany researchers. On the basisofsummarizing the research work about theRangeDopplerGeolocationModelofSAR, Thispaper focuseson the study ofRPCmodel forSAR mi ages and geometric rectification ofSAR mi ages. In this paper, TerraSAR-X, COSMO high-resolution SAR data are used as an example to establishing the Range DopplerGeolocationModelwhich can calculate the geology coordinates from the mi age coordinates. This can explain the feasibility of theRPCModel on SAR mi ages. And one expermi enthas been done to prove it. The RPCModel hasmore than one percentpixel accuracy.