基于RPC模型的高分辨率SAR影像正射纠正

Geometric Rectification of High Resolution Spaceborne SAR Image Based on RPC Model

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) 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.