从雷达成像机理出发，详细介绍了星载SAR（Synthetic Aperture Radar）图像的定位算法，并结合仿真的数据和Radarsat卫星的图像，对定位精度进行了分析和研究，研究结果表明，地形起伏、轨道测量误差、回波延时测量误差是影响定位精度的主要因素。在Radarsat卫星本身的系统测量精度范围内，该算法可以使Radarsat图像的定位精度达到600-800m，如果地面站能够提供精确轨道数据，定位精度可进一步提高。

This paper introduced the algorithms of SAR image location on the basis of image processing. And the precision of location is analyzed by the simulated datum and Radarsat slant image. The result indicated that the terrain variation, orbit measurement and echo pulse delay are the main factors which influenced the location precision. To Radarsat image, the location precision can attain 600-800m.