星座备份策略研究进展

针对星座卫星在轨运行时因操作或故障导致星座服务性能下降的现象，综述了星座备份策略研究的进展。首先，概述了导航星座、通信星座的基本情况和备份现状，归纳出不同星座的备份策略。其次，重点阐述了3种不同的星座备份策略模式，即在轨备份、停泊轨道备份及地面备份，给出了3种备份策略模式的特点。在此基础上，分别从卫星故障模式、卫星可靠性、卫星可用性、星座状态概率和星座系统可用性5个方面梳理了国内外星座备份策略关键因素的研究进展。再次，综述了目前星座备份策略分析的主要模型和方法，包括Petri网、马尔可夫链以及存储论。最后，对未来星座备份策略研究的发展方向进行了展望。

Research progress of constellation backup strategy

In view of the phenomenon that constellation service performance worsens due to operation or failure of constellation satellite in orbit, the research progress of constellation backup strategy was reviewed. Firstly, the basic situation and backup status of navigation constellation and communication constellation were summarized. The backup strategies of different constellations were concluded. Secondly, three different constellation backup strategies,i.e., in-orbit backup, parking orbit backup and ground backup, were highlighted. Then in terms of satellite failure, satellite reliability, satellite availability, constellation state probability and constellation system availability, the research progress in the key factors of the constellation backup strategy were reviewed. Thirdly, the main models and methods for the analysis of constellation backup strategy were introduced, including Petri nets, Markov chains and inventory theory. Finally, the future research directions of constellation backup strategy were prospected.