As active remote sensing sensor

spaceborne Synthetic Aperture Radar（SAR） with merits of broad range image

all-weather work time and strong penetration which is widely used in mapping

geology

hydrology

agriculture

forestry and so on

is an important part of the Modern radar technology.The application of SAR needs to know the exact location of the corresponding space information which must be carried out on the geometric rectification of SAR image processing geometric correction

elimination various geometric deformation exist in the SAR images.RPC model is a mathematical sense of the imaging geometry model

which is independent of the sensor and platform.The model establish the relationship between the ground coordinates of any image and the corresponding geology coordinates.A lot of work has been done on RPC model for optical sensor by many researchers.On the basis of summarizing the research work about the Range Doppler Geolocation Model of SAR

This paper focuses on the study of RPC model for SAR images and geometric rectification of SAR images.In this paper

TerraSAR-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 image coordinates.This can explain the feasibility of the RPC Model on SAR images.And one experiment has been done to prove it.The RPC Model has more than one percent pixel accuracy.