高分三号SAR卫星系统级几何定位精度初探

Preliminary Exploration of Systematic Geolocation Accuracy of GF-3 SAR Satellite System

高分三号SAR卫星是我国首颗空间分辨率达到1 m的C波段多极化合成孔径雷达成像卫星,于2016年8月成功发射,并通过5个月的在轨测试任务,于2017年1月正式交付用户单位使用。该文利用高分三号卫星实际在轨监测数据,分析了从数据采集、大气传输到成像处理与几何定位的全链路系统级几何定位误差源,并进行了基于角反射器的几何定位精度验证实验。实验结果表明,高分三号SAR卫星系统几何定位精度可以达到3 m。

GF-3, the first full-polarimetric Synthetic Aperture Radar （SAR） satellite of China with a resolution up to 1 m, was successfully launched in August 2016 and, after 5 months of in-orbit calibration, it was officially delivered to the users in January 2017. In this paper, the geometric positioning error sources of the entire system are analyzed based on the real data acquisition, including atmospheric transmission, image processing, and geometric positioning. The positioning precision of the SAR system is validated by corner reflectors. The results show that the satellite positioning accuracy improved by 3 m.