空天飞行器多源多余度模糊容错导航系统设计方法

空天飞行器多任务、多工作模式的特征，要求导航系统具有灵活性且保证精确性和稳定性。在空天飞行器中，常用多种导航传感器组成多源容错组合导航系统，但是单余度组合导航系统并不能满足空天飞行器可靠性的要求。针对上述问题，提出一种多源多余度模糊容错导航系统设计方法，在每个余度系统已设计故障诊断和隔离的基础上，通过模糊评估计算每个导航系统的品质因子，从而有效地诊断和隔离惯性导航系统的故障，保证导航系统的精度和可靠性，该方法对软、硬故障均具有较好的处理能力。仿真结果表明，基于该方法的导航系统结构具备容错性能，在系统出现故障的情况下，比传统多源导航系统具有更优的性能，且在不同飞行阶段具备良好的适用性。

The Design Method of Multi-source Redundant Fuzzy Fault-tolerant Navigation System for Aerospace Vehicles

The multi-mission and multi-working mode of aerospace vehicles requires the navigation system to be flexible, accurate and stable. In aerospace vehicles, a variety of navigation sensors are often used to form a multi-source fault-tolerant integrated navigation system. A multiple source redundancy design method of fuzzy fault-tolerant navigation system is proposed. On the basis of designed fault diagnosis and isolation of each redundant system, the quality factor of each navigation system is calculated through fuzzy evaluation, thus effectively diagnosing and isolating the failure of inertial navigation system and ensuring its accuracy and reliability.The proposed method has good processing capacity for soft and hard faults. The simulated results show that the proposed method-based navigation system has the fault-tolerant performance. In the case of system malfunction, it has better performance compared to the traditional multi-source navigation system and good applicability in different flying stages. Key