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针对导航星座星地联动运行、单星轨道机动调控、可靠性、维修性、保障性要求高、面向用户指标集中等特点,在分析导航星座系统效能概念的基础上,研究提出以星座可用性、连续性、覆盖性为构成要素,集成应用Petri网、中断分析、贝叶斯网构建星座系统效能模型的方法,利用重要度排序识别系统薄弱环节并给出优化方案比对分析。最后将模型应用于虚拟构建的区域导航系统。仿真算例表明,提出的建模与分析方法可为导航星座设计优化和星地保障运行方案决策提供量化依据。
In view of the characteristics of navigation constellation star linkage operation, monorail orbit maneuvering control, reliability, maintainability, high security requirements and user-oriented target concentration, based on the analysis of the performance concept of navigation constellation system, And coverage as constituent elements, integrating Petri net, interrupt analysis, and Bayesian network to construct the constellation system performance model, using the importance ranking to identify the weak links in the system and giving the comparison and analysis of optimization schemes. Finally, the model is applied to the virtual navigation system. The simulation results show that the proposed modeling and analysis methods can provide quantitative basis for the design optimization of navigation constellation and the decision-making of operational scheme of star ground protection.