摘要
针对合成孔径雷达侧视成像几何畸变引起的透视收缩、迭掩、阴影等特有现象的问题,该文从星载合成孔径雷达的成像机理出发,利用高精度的星历数据,基于距离-多普勒(R-D)模型和地球模型对合成孔径雷达影像进行正射纠正试验。它的优点是只需要少量控制点对卫星轨道参数进行校正便能获得较高的定位精度。根据这种方法,该文利用一景TerraSAR影像进行试验:使用5个控制点校正轨道参数后,无DEM支持正射纠正后影像的平面精度能达到45m,在90m格网的SRTM支持下平面精度达到7m。试验结果证明,该文所采用的对TerraSAR影像的正射纠正算法是可行的,具有较好的应用前景。
Owing to the characteristics of the SAR geometric imaging, a method to determine the ground coor- dinates of a SAR image pixel was put forward in this paper. An iterative process was adopted to realize the othorec- tification utilizing the satellite ephemeris data, SAR range-Doppler equation and earth surface model. This approach has an advantange over previous techniques, it can achieve higher accuracy with spare ground control points. According to it, experiments have been done on TerraSAR imagery in China in this paper. The final accura- cy was 45m using 5 control points and reached 7m with SRTM DEM. The results indicated that the method of Ter- raSAR image orthorectification introduced in this paper was efficient and practical.
出处
《测绘科学》
CSCD
北大核心
2015年第10期153-156,共4页
Science of Surveying and Mapping
基金
河南省高等学校重点科研项目(15B420001)
