组合导航系统的可靠性分析

Reliability Analysis for integrated Navigation Systems

针对ＧＰＳ／ＩＮＳ／ＲＡ组合导航系统的组合方案，应用故障树分析法（ＦＴＡ）对该系统的可靠性进行分析。分别建立了以组合导航系统故障作为顶事件的故障树以及以高度通过故障作为顶事件的故障树，从而为分析组合导航系统的可靠性提供了直观而有效的分析方法。在所建立的故障树基础上推导系统可靠性数学模型，并应用马尔科夫过程理论分析可维修组合导航系统在组合传感器这一级的各种状态，建立了状态转移图，推导出这一级的有效度Ａ及ＭＴＢＦ的数学模型，为定量评价系统可靠性提供参考。

This paper analyses the reliability of GPS/INS/RA integrated navigation systems via the Fault Tree Analysis (FTA) method. We establish the fault trees with the fault of integrated navigation systems as the top event and the fault of the altitute tunnel as the top event separately, which provides an intuitive and effective approach to the analysis of the reliability of integrated navigation systems. On the basis of the resultant fault trees, the mathematical model of the system reliability is derived. Furthermore, every state of integrated sensors in the maintainable integrated navigation systems is analysed using Markov process theory, and the state translation diagram is presented. Finally, the corresponding mathematical models of the availability A and MTBF are yielded, which are valuable in the quantitative evaluation of the system reliability.