考虑地球扁率修正的基于日地月方位信息的地球卫星自主导航

Autonomous Navigation System Based on Sun-Earth-Moon Orientation Information with Earth's Oblateness Correction

给出了基于地球球形假设的双圆锥地心方位确定算法,研究了考虑地球扁率的地心方位精确确定算法,给出了基于扁率修正的日地月自主导航算法。蒙特卡洛仿真表明,对于500km高度,对地定向三轴稳定的姿态运行模式的卫星,在地球敏感器噪声为0.1°(3σ),日、月敏感器噪声为0.05°(3σ)的情况下,导航位置精度能达到800m(3σ),速度精度能达到2.4m/s(3σ)。

Two methods of Earth orientation determination are proposed by using dual cone earth sensor in this paper. One is based on the assumption of spherical earth, and for the other method the effects of earth＇ s oblateness is considered. A least square navigation algorithm with earth＇ s oblateness correction is also presented in this paper. Monte-carlo simulation results show that the navigation algorithm with earth＇ s oblateness correction can achieve of position accuracy 800m （3σ） and 2.4m/s （3σ） velocity accuracy under measurement noises of 0. 1° （3σ） for the earth sensor and 0.05° （3σ） for the sun and moon sensor.