关键词: TerraSAR-X, 距离多普勒模型, 图像定位, 几何纠正

Abstract: The algorithm of high geometric correction precision is significant for the wide application of TerraSAR-X images. Meanwhile, the modeling of TerraSAR-X images geopositioning is the foundation of geometric TerraSAR-X images correction. After describing the range-doppler model, this paper tries to carry out the geopositioning experiment using high-resolution TerraSAR-X images. The results show that the geopositioning accuracy of the two parameter equations and three parameter equations is similar and can meet the need of the practical applications. To calculate conveniently and reduce the amount of the control points, it is common that the two parameter equations should be used to describe the geopositioning of the satellite. After calculating the geopositioning parameters, the indirect rectification method of the images is introduced to rectify the images and the rectification accuracy is within 3 pixels. This shows that the algorithm is reasonable and feasible.

Key words: TerraSAR-X, range-Doppler model, image geolocation, geometric rectification