利用SAR卫星在多个时刻的位置和速度信息，计算出任意象元成像时刻卫星的位置，拟合出SAR卫星的轨道模型。-Using SAR satellite in multiple time position and velocity information to calculate as the image element imaging time satellite position, fitting the SAR satellite orbital model.

利用有理函数模型进行空间前方交会程序，已知同名像点和2张卫星影像的有理函数RPC文件用于求地面点坐标。-Space forward intersection process using rational function model, known as points and 2 with the same satellite images of the rational function RPC file is used to beg the ground point coordinates.