空间目标碰撞预警摄动因素研究

针对解析筛选方法中摄动因素易造成漏报危险时间区间的问题,改进了时间筛选算法. 该方法在时间筛选中,增加了初始窗口修正,并在周期修正中考虑了偏心率摄动. 以2005年发生的空间目标相撞事件为例,在不同的预警时间区间中,讨论了摄动因素对几何筛选的影响,并对比了无摄动、原方法和改进的时间筛选方法得到的危险时间区间. 结果表明,摄动因素可有效降低几何筛选中由接近距离偏小造成错误筛除危险目标的风险,改进后的时间筛选算法比原方法能得到更为完整准确的危险时间区间. 

The Perturbation Effects on the Collision Warning for Space Object

For the problem of omitting dangerous time windows caused by perturbation factors while using analytical methods, the time prefilter algorithm was improved. In this method, the perturbation effect on first time window correction was introduced, and the effect of oblateness on the period of time window was considered. Take the space collision between two space objects in 2005 as an example, the perturbation effect on geometrical prefilter in the different time spans of interest was discussed, and the time windows that were calculated respectively by the time prefilter with no perturbation method, original method and improved method were compared. Results show that perturbation factor consideration can effectively reduce the risks of error screening dangerous targets due to chosen too small approach distance, and the time windows got from improved time prefilter algorithm is more complete and accurate.