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卫星导航系统星座可用性分析面临准确性和快速性的矛盾。论文在研究全球卫星导航系统(global navigation satellite system,GNSS)星座可用性分析需求的基础上,系统地定义了导航系统可用性的基本概念,给出了基于分系统部件失效计算导航星座可用性的方法,提出了基于Markov过程的单星可用度算法,建立了基于星座状态概率的服务可用性计算模型,并结合导航基本原理模型得到了导航星座的可用性。最后,基于此方法针对北斗区域卫星导航系统相关数据对其星座可用性进行了仿真和实验分析。结果表明,本文所提方法和模型能够满足卫星导航系统星座可用性分析的特殊需求。
Satellite navigation system constellation usability analysis is facing the contradiction between accuracy and speed. Based on the research of the constellation usability analysis requirements of global navigation satellite system (GNSS), the thesis systematically defines the basic concepts of usability of navigation system, and presents a method to calculate the availability of navigation constellations based on the failure of subsystems. Based on the single-satellite availability algorithm based on Markov process, a service availability calculation model based on the constellation state probability is established, and the availability of the navigation constellation is obtained according to the basic navigation model. Finally, based on this method, the constellation usability of BeiDou regional satellite navigation system is simulated and experimentally analyzed. The results show that the proposed method and model can meet the special needs of constellation usability analysis of satellite navigation system.