基于Markov过程的导航系统星座可用性分析

Availability analysis for constellation of GNSS based on Markov process

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。

It is a contradiction between accuracy and rapidity of availability analysis for constellation of the global navigation satellite system （GNSS）. The requirements for availability analysis are researched firstly, and then the basic definition for availability of the constellation is analyzed, the method for analysis based on failure subsystem is proposed, the algorithm for single satellite based on Markov process is given, and the model of service availability based on constellation state probability is developed, the availability of the constellation can be calculated with the model and the basic principles of navigation. Finally, the regional availability performance of the BeiDou satellite navigation system is analyzed based on the proposed architecture and method. The results show that the proposed methods and models meet the special needs for availability analysis of GNSS.