作者: Zhao, RS (Zhao, Ruishan); Zhang, G (Zhang, Guo); Deng, MJ (Deng, Mingjun); Xu, K (Xu, Kai); Guo, FC (Guo, Fengcheng)

来源出版物: SENSORS 卷: 17 期: 9 文献号: 1977 DOI: 10.3390/s17091977 出版年: SEP 2017

摘要: The GF-3 satellite is the first multi-polarization synthetic aperture radar (SAR) imaging satellite in China, which operates in the C band with a resolution of 1 m. Although the SAR satellite system was geometrically calibrated during the in-orbit commissioning phase, there are still some system errors that affect its geometric positioning accuracy. In this study, these errors are classified into three categories: fixed system error, time-varying system error, and random error. Using a multimode hybrid geometric calibration of spaceborne SAR, and considering the atmospheric propagation delay, all system errors can be effectively corrected through high-precision ground control points and global atmospheric reference data. The geometric calibration experiments and accuracy evaluation for the GF-3 satellite are performed using ground control data from several regions. The experimental results show that the residual system errors of the GF-3 SAR satellite have been effectively eliminated, and the geometric positioning accuracy can be better than 3 m.