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高精度卫星轨道和姿态参数的获取对卫星数据产品的推广应用具有重要意义。对“资源三号”卫星元数据文件(.AUX)的数据格式、参数意义以及量纲进行了深入的研究和分析,拟合得到任意时刻卫星的轨道和姿态参数。对拟合精度的分析表明,“资源三号”卫星轨道运行平稳,利用二次多项式拟合卫星轨道,精度可达到米级,与星上GPS设计的5 m测量精度保持了很好的一致性。成像期间,其姿态变化相当稳定。该值可以作为外方位元素的初始值应用于卫星的在轨几何检校与影像的精确定位。
The acquisition of high-precision satellite orbit and attitude parameters is of great significance for the popularization and application of satellite data products. The data format, parameter meaning and dimension of the “Satellite No.3” satellite metadata file (.AUX) are deeply studied and analyzed, and the orbit and attitude parameters of the satellite at any moment are obtained by fitting. The analysis of the fitting accuracy shows that the orbit of “Resource No.3” is stable and the satellite orbit can be fitted by means of the second order polynomial, the accuracy can reach the level of meters, which is in good agreement with the 5 m measurement accuracy of onboard GPS consistency. During imaging, the posture changes quite stable. This value can be used as the initial value of the out-of-plane element for in-orbit geometry calibration and precise positioning of the satellite.