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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.
Aiming at the current methods of ballistic missile selection for ballistic missiles, a method of selecting navigation stars based on standard trajectory homogenization is studied. By analyzing the influence of missile flight trajectory and flight parameters, Based on the reference points on the celestial sphere and the proposed “distance-stellar” weighting method, the selection of the navigation star is simplified, and the computational and searching problems due to the changes of the shooting direction and the coordinates are simplified. , The navigation star is selected uniformly and the satellite navigation system with good applicability is constructed according to the k-vector index method, which can effectively improve the efficiency of the star recognition algorithm. The simulation results show that the method is simple and easy to use, The number of navigation stars is small and the distribution is good, and the recognition time can be effectively reduced on the basis of not reducing the successful rate of star chart recognition.