Quantitative Performance for Spacecraft Rendezvous Trajectory Safety
Quantitative Performance for Spacecraft Rendezvous Trajectory Safety
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DOI：
10.2514/6.2010-7662
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发表时间：
2010-08
期刊：
影响因子：
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通讯作者：
Ya-zhong Luo;Li-bo Liang;Hua Wang;G. Tang
中科院分区：
文献类型：
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作者：
Ya-zhong Luo;Li-bo Liang;Hua Wang;G. Tang
在确定交会使命运行剖面时，安全要求是最关键的方面之一，特别是随着自主航天器交会的发展。提出了一种考虑导航误差和控制误差的航天器交会轨道安全性能指标，该指标包括追逐飞行器3σ椭球与目标飞行器控制区的最小距离和两飞行器的最大瞬时碰撞概率。前者是在3σ椭球与控制区不相交的情况下，定量计算安全度;后者是在3σ椭球与控制区相交时，定量计算碰撞概率。给出了安全性能指标的详细定义和简化计算方法。算例验证了该安全指标的有效性。分析了过渡时间、脉冲个数和脉冲间隔对弹道安全特性的不同影响。得到了一些有益于安全交会轨道设计的结论。
Safety requirement represents one of the most critical aspects when defining the operational profile for a rendezvous mission, especially with the development of autonomous spacecraft rendezvous. A quantitative safety performance index of spacecraft rendezvous trajectory with considering navigation errors and control errors is proposed, which involves the minimum distance between the 3σ ellipsoid of the chaser vehicle and the control zone of the target vehicle and the maximum instantaneous collision probability of these two vehicles. The former is to quantity degree of safety under the condition of no intersection between the 3σ ellipsoid and the control zone, while the latter is to quantity the collision probability when they intersect. The detailed definition of the safety performance index and the simplified calculation methods are provided. The efficiency and effectiveness of this safety index are testified by an example. The different influences of the transfer time, the number of impulses, and the intervals of impulses on the trajectory safety characteristic are analyzed. Several conclusions that would be useful for further safe rendezvous trajectory design are obtained.