高分七号卫星是我国首颗亚米级立体光学测绘卫星,为全面评价和分析卫星的姿态数据,提出精确性、稳定性及几何定位精度评估方法.结果表明:1a1b星敏的光轴夹角中误差优于0.6″,而2a2b星敏的优于1.9″;星上实时滤波姿态的欧拉角的中误差优于0.3″;地区几何定位精度为:山东地区的平面位置与高程的均方根值(RMS)分别为 4.4 m、3.0 m,江苏地区为6.5 m、2.1 m,宁夏地区为8.8 m、3.8 m.
Evaluation and Analysis of Attitude Accuracy of Gaofen-7 Satellite
The Gaofen-7 satellite is China's first sub-meter three-dimensional optical mapping satellite.In order to com-prehensively evaluate and analyze the attitude data of the satel-lite,this article proposes a set of accuracy,stability and geo-metric positioning accuracy analysis methods based on raw da-ta obtained by the star sensor and gyroscope and real-time fil-tered attitude data on the satellite.The test results show that:the error of the optical axis angle of the domestic star sensor is better than 0.6 ″;while the imported star sensor is better than 1.9 ″;the error of the Euler angle of the real-time filtering at-titude on the satellite is better than 0.3″;The geometric posi-tioning accuracies in different regions are:the root mean square(RMS)values of plane position and elevation in Shan-dong are 4.4 m and 3.0 m respectively,in Jiangsu they are 6.5 m and 2.1 m,and in Ningxia they are 8.8 m and 3.8 m.
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