本文介绍了合成孔径旁视雷达图象几何误差的产生原因与分析了楔形透镜的校正原理.用楔形透镜放大器来校正旁视雷达图象的几何误差,最后得到较精确的雷达图象. In this paper, the reason of geometric errors of synthetic aperture radar and the correction principle of the wedge lens are introduced.Wedge lens amplifier is used to correct the geometrical error of the side-view radar image and get the accurate radar image finally.