Direct geolocation of terrasar-X spotlight mode image and error correction

The research dealt with direct geolocation of spaceborne high-resolution SAR image. The TerraSAR-X spotlight mode image was chosen as the study object. The mathematical model of SAR geolocation is Range-Doppler (RD) model. Its resolving algorithms had been studied and the ASF algorithm was chosen because of its high accuracy. The focus of this research laid on the error sources and their correction method which could affect the geolocation accuracy, such as the orbit errors, azimuth timing errors and range timing errors. At last, the accuracy of this method was verified by the experiment results.EI