Geometric positioning parameter correction method and system for SAR images

The invention relates to a geometric positioning parameter correction method for SAR images, and aims at a problem of high-precision geometric positioning of the SAR images of multiple scenes in a large area. According to the method, an SAR terrain texture map is generated by utilizing geometric imaging information of the SAR image of one scene and DEM data, geometric positioning parameter correction reference points are extracted through feature point extraction and matching, a geometric positioning parameter correction model is established according to a geometric positioning model for the SAR image, a geometric positioning parameter correction value of the image is computed by utilizing the correction reference points, and lastly, the geometric positioning parameters of other SAR imagesare corrected by utilizing the correction value, so that the geometric positioning precision of the SAR images in the whole area is improved, and large-range high-precision geometric processing of the SAR images without a co