在轨物体接近算法研究

根据NORAD公布的在轨物体(空间碎片或航天器)的轨道数据,给出了计算在轨物体两两间发生接近事件的方法。该方法结合了计算在轨物体接近的运动学筛选法和相对距离函数法,以提高计算效率。以该方法为基础,提出了特定航天器与全体在轨物体间的接近事件算法。算法采用了改进后的几何筛选法。该方法并不求解两轨道的最近点,而是求解包含最近点的时间窗口,从而解决了原方法漏报接近事件的问题。该方法在理论上可以检测到所有的接近事件,数值仿真验证支持了该结论。在计算效率上新方法相对于原算法也有约10倍的提高。

Methods to Determine Close Approaches Among Orbiting Objects

Based on orbital data of orbiting objects(orbital debris and spacecraft) published by NORAD,a method was proposed to determine close approach events for orbiting objects catalog against itself.It combined a dynamic sieve and a relative motion function to accelerate calculation.An algorithm applying this method was developed to detect close conjunctions between a specific spacecraft and the object catalog.It adopted an improved geometrical filter.The original method may miss most of close approach events.To solve this problem,instead of calculating closest points between two orbits,a time window containing the closest points was estimated.In principle,these two methods can detect all existing conjunctions.The results of several numerical tests supported this statement and also indicated that the new methods reduced compute time by about 10 times.