基于恒星运动轨迹的卫星姿态抖动研究

Research on Satellite Attitude Jitter Based on Stellar Motion Trajectory

卫星姿态的精度直接影响到地面定位的几何精度,然而由于各种因素的影响,卫星平台不可避免地存在着一定的姿态抖动现象。本文在研究星敏感器定姿过程中恒星亚像素质心时得出,恒星在星图中的轨迹线为一个圆弧曲线和一个约0.298 Hz的抖动的和,为将恒星运动轨迹纳入亚像素质心提取过程提供理论基础。

The precision of satellite attitude will directly affect the geometric accuracy of locate position. But because of various factors,there is a certain attitude dithering phenomenon exist in satellite platform,in the process of subpixel centroid extraction,this paper conclusions that star＇s trajectory on star map can be described as sum of a circular arc curve and a shake with 0.298 HZ. This will provide the theoretical basis for incorporating the trajectory of the star into the subpixel mass extraction process.