Abstract: A method is developed in this paper to determine the location precision of a pixel in the TerraSAR image without any ground reference points.This method utilizes the spacecraft ephemeris data and the characteristics of the SAR data to estimate the three-dimensional coordinate of the arbitrary pixel.The experiment uses the TerraSAR image of Hangzhou where the average elevation is 60 m.The location precision can attain 24.588 m at the range and 12.265 m at the azimuth with this method.

Key words: TerraSAR image, spacecraft ephemeris, location precision without ground reference points

摘要： 针对星载TerraSAR图像无地面控制点情况下的目标定位问题，在分析利用卫星星历数据的基础上，结合SAR距离模型和地球椭球模型，提出了一种TerraSAR图像的地面目标直接定位方法。通过杭州地区数据实验结果表明，TerraSAR图像在平均高程60 m的丘陵地区，无控制距离向和方位向的定位精度中误差分别达到24.588 m和12.265 m。

关键词: TerraSAR图像, 卫星星历, 无控制定位精度