基于天象匹配的地心矢量确定方法

天象匹配是一种完全自主,且能提供姿态和位置信息的导航技术,其中,地心矢量的确定是天象匹配技术的关键。本文在地球模型为理想圆球的假设前提下,给出了两种基于天象匹配的地心矢量确定方法,一种是辅助单位球法,一种是椭圆模型直接法。最后,分别将两种地心矢量的确定方法应用于某高轨运载器中进行数学仿真,结果表明,两种方法均能满足系统的精度要求。

Geocentric Vector Determination Based on Celestial Phenomena Matching

As an independent navigation technology,celestial phenomena matching(CPM) can supply the information of attitude and position.The Geocentric Vector Determination(GVD) is one of the keys of CPM.Based on the sphere earth model,two methods of GVD are proposed in this paper.One is Assistant Unit Sphere Method(AUSM),and the other is Ellipse Model Direct Method(EMDM).At the end of this paper,both methods of the GVD are applied to some high-orbit launch vehicle.The simulation results show that both methods can satisfy the required precision of the launch vehicle.