GF-1卫星WFV影像几何定位稳定性研究

针对GF-1卫星WFV传感器高分辨率与大视场相结合的特点，本文将ZY-3卫星传感器校正产品作为参考，通过分析同名点对的地理信息，对北京地区WFV传感器4台相机影像相对几何定位精度进行长时间序列评价，分析其误差特征。试验结果表明，单景影像均出现了明显的系统几何定位误差，但是不同时相影像的几何定位误差方向并无明显规律。针对该现象本文基于相机成像原理，从理论上证明了仅利用某一时相影像的有理函数模型补偿参数是无法有效消除其他不同时相影像系统误差的。

Study on the Geo-positioning Stability of GF-1 WFV Images

Through integrating the characteristics of GF-1 satellite WFV sensor which possesses high resolution and wide field view, taking ZY-3 sensor correction production as reference data, analyzing geographic information of homologous points, this paper evaluates the relative geo-positioning accuracy of four WFV cameras in Beijing area and finds the geo-positioning error characteristics. The experiment results show that the geo-positioning errors in one signal image appear obviously systematic errors. However, the geometric error directions of different phase images are irregularity. In view of this phenomenon, basing on the camera imaging principle, this paper theoretically proves that it is difficult to effectively eliminate the system errors of other phase images with compensation parameters of RFM ( rational function model) of one phase image.