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主动接近式航天器威胁分析方法 被引量:3
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作者 吴丽君 张皓 《现代防御技术》 北大核心 2022年第6期11-18,共8页
针对具有机动能力的非合作主动接近航天器,提出一种威胁指标计算模型,用于分析追踪航天器对目标航天器的威胁大小。分析追踪航天器的任务模式,利用双脉冲Lambert算法得到交会所需的脉冲冲量和交会时间,以其为威胁要素,选择最具威胁性的... 针对具有机动能力的非合作主动接近航天器,提出一种威胁指标计算模型,用于分析追踪航天器对目标航天器的威胁大小。分析追踪航天器的任务模式,利用双脉冲Lambert算法得到交会所需的脉冲冲量和交会时间,以其为威胁要素,选择最具威胁性的接近路线进行威胁要素的加权,计算得到综合威胁指标。仿真结果表明,追踪航天器的威胁指标对于轨道数据变化十分敏感,相比于常用的相对距离指标,根据威胁指标变化趋势可以更快判断出非合作航天器某次机动的接近意图。在复杂空间态势背景下,该模型可以完成主动接近式航天器的威胁预判,以便及时采取防护措施,提升卫星生存能力。 展开更多
关键词 非合作航天器 威胁要素 双脉冲交会 指标加权 威胁指标 威胁预判
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Reconfiguration of Spacecraft Cluster Based on Distributed Local Information
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作者 YU Binggu WANG Shuquan 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2021年第4期704-712,共9页
The reconstruction of spacecraft cluster based on local information and distributed strategy is investigated.Each spacecraft is an intelligent individual that can detect information within a limited range and can dete... The reconstruction of spacecraft cluster based on local information and distributed strategy is investigated.Each spacecraft is an intelligent individual that can detect information within a limited range and can determine its behavior based on surrounding information.The objective of the cluster is to achieve the formation reconstruction with minimum fuel consumption.Based on the principle of dual pulse rendezvous maneuver,three target selection strategies are designed for collision avoidance.Strategy-1 determines the target point’s attribution according to the target’s distance when the target point conflicts and uses a unit pulse to avoid a collision.Strategy-2 changes the collision avoidance behavior.When two spacecraft meet more than once,the strategy switches the target points of the two spacecraft.In Strategy-3,the spacecraft closer to the target has higher priority in target allocation.Strategy-3 also switches the target points when two spacecraft encounter more than once.The three strategies for a given position,different completion times,and random position are compared.Numerical simulations show that all three strategies can accomplish the spacecraft cluster's reconfiguration under the specified requirements.Strategy-3 is better than Strategy-1 in all simulation cases in the sense of less fuel consumption with different completion times and given location,and it is more effective than Strategy-2 in most of the completion time.With a random initial position and given time,Strategy-3 is better than Strategy-1 in about 70%of the cases and more stable. 展开更多
关键词 spacecraft cluster formation reconstruction relative Lambert problem two-impulse rendezvous distributed maneuver
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