一种地球同步自旋卫星红外弦宽差分定姿方法

Attitude Determination with Differential Values of the Earth Width for On-orbit Spin Stabilized Geostationary Satellites

提出了一种定点后地球同步自旋卫星姿态确定方法,推导了它的计算公式。充分利用了定点后卫星相对地球位置固定不变的特点,只利用一个参考矢量和卫星的位置信息,就可以确定卫星的姿态,完全消除了传统定姿态方法的几何条件限制。由于本方法姿态计算过程中利用的是星上红外地球敏感器测量数据的差分值,消除了测量数据中系统差对定姿精度的影响,使定姿精度提高到0.01°,实际工程应用效果进一步证明了该算法的正确性和精度。

Contrary to the traditional method which based on the two reference vectors to determine the attitude of an on-orbit spin stabilized geostationary satellite, this paper presents a novel algorithm, which based only on one vector and the satellite＇s position. Therefore the limitation on geometry for traditional method can be left. With only using the differential values measured by an on-board infrared earth sensor, the new algorithm can eliminate the inherent measure errors caused by the installation error and the shift of center of mass. Furthermore, after canceling the arbitrary measure errors, theoretically, no error will be added to the attitude determination results. The precise is improved to 0.01° accuracy level. Finally, the novel algorithm has been used to determine and control the attitude of China on-orbit spin stabilized geostationary satellites（FY-2）.