基于元数据文件的ZY-3轨道和姿态参数的精确获取

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米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。

Precise Acquisition of ZY-3 Orbit and Attitude Parameters Based on Metadata File

The acquisition of high precision satellite orbit and attitude parameters is of great significance for the popularization and application of satellite data product. The data format, the meaning of the parameters and dimension of ZY-3 satellite metadata file (. AUX) are analyzed, and the satellite orbit and attitude parameters are fitted for any time. The analysis of the fitting accuracy shows that the ZY-3 satellite orbit is operating smoothly, by the, and the accuracy of satellite orbit fitting based on quadratic polynomial can reach meter level, and it keeps a good consistency with 5 m measurement accuracy designed by GPS on the satellite. In the imaging period, its attitude change is quite stable. This value can be used as the initial value of exterior orientation elements applied to the satellite on-orbit geometric calibration and the accurate positioning of image.