适用于弹道导弹的导航星选取方法

针对当前适用于弹道导弹的导航星选取方法较少,研究了一种根据标准弹道均匀化选取导航星的方法.通过分析导弹飞行弹道及飞行参数的影响,在构建"伪天球"坐标系的基础上,确定了导航星的选取区域,简化了因射向变化、坐标越界等造成计算和搜索比较复杂的问题;基于天球上的基准点及提出的"距离-星等"加权法,均匀化地筛选导航星,并按照k-vector索引方式构建适用性较好的弹载导航星表,可以有效地提高星图识别算法的效率.仿真结果表明,该方法简单易行,选取的导航星数量少,分布均匀性好,在不降低星图识别成功率的基础上,能够有效地减少识别时间.

Guide star selection method applied to ballistic missile

The present researches on guide star selection methods applied to ballistic missile are not enough, therefore a novel uniformization selection method according to standard trajectory was discussed. By analyzing the impacts of missile trajectory and various flight parameters, and constructing the ‘pseudo celestial sphere coordinate frame', the guide star selection region was determined. The problems caused by fire direction changing or coordinates boundary exceeding were simplified. The guide stars were selected and homogenized on basis of reference points on celestial sphere and the proposed ‘Separation-Magnitude' weighting method. The on-board guide star catalog having better applicability was generated via k-vector index approach, and the efficiency of star identification algorithm would be improved. The simulation results indicate that the method implements simply. Much less guide stars which have better uniform distribution are selected. The elapsed time of star identification is effectively reduced on the basis of the undiminished identification success rate.