在分析TerraSAR-X、COSMO-SkyMed等高分辨率SAR影像成像几何模型的基础上,采用RPC模型拟合SAR影像的成像几何模型,拟合的精度在1%个像素以内;在1∶5万DRG上选取1个控制点对RPC模型参数精度的改进,结合1∶5万DEM对TerraSAR-X、COSMO-SkyMed数据进行正射纠正,纠正结果能满足1∶5万DOM的精度要求.从而说明RPC拟合雷达成像几何的正确性以及利用RPC模型进行高分辨率SAR影像正射纠正的可行性.

As active remote sensing sensor, spaceborne Synthetic Aperture Radar (SAR) withmerits ofbroad range miage, all-weatherwork tmi e and strong penetrationwhich iswidely used inmapping, geology, hydrology, agriculture, forestry and so on, is an mi portantpartof the Modern radar technology. The application of SAR needs to know the exact location of the corresponding space informationwhichmustbe carried out on the geometric rectification ofSAR mi age processing geometric correction, elmi ination various geometric deformation exist in the SAR mi ages.RPC model 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 miage and the corresponding geology coordi-nates. A lotofwork hasbeen done onRPCmodel foroptical sensorbymany researchers. On the basis of summarizing the research work about the Range Doppler Geolocation Model of SAR, Thispaper focuseson the study of RPC model for SAR mi ages and geometric rectification of SAR mi ages.In this paper, Terra SAR-X, COSMO high-resolution SAR data are used as an example to establishing the Range Doppler Geolocation Model which can calculate the geology coordinates from the mi age coordinates. This can explain the feasibility of the RPC Model on SAR mi ages. And one expermi enthas been done to prove it. The RPC Model hasmore than one percentpixel accuracy.