针对采用两种通信总线作为主要通信的复杂航电系统，通过研究其体系结构，利用故障树对系统可能故障进行分析，优化了单总线通信系统中主备机表决算法，设计了一种双总线通信系统中主备机的同步和双机切换机制，提升了双机切换的性能，实现了系统故障时的平滑切换运行，提高了双机切换的实时性和双机备份系统的可靠性。

The architecture of complex system is studied, in which devices communicating via two types of bus, and fault analysis trees are built for the typical faults. Based on the optimized voting algorithm of the single bus system for switching the master and backup, a mechanism is designed to switch master-backup in the dual bus system and to synchronize the information. The mechanism can give a big improvement on the performance and reliability of the master- backup switching.

TP302.8