为了抑制计算机系统软件和硬件可能发生的共模故障，在余度技术的基础上，分析了非相似余度技术及其采用的余度结构和余度数量。分别从硬件架构设计、软件架构设计及热备份切换逻辑等方面详细论述了一种非相似双余度告警计算机的设计和实现方法，并且使用故障树模型分析方法在实验数据的基础上对该系统的可靠性进行了分析和计算。结果表明,采用非相似双余度技术可以有效地抑制系统的软件和硬件可能发生的共模故障，将机载告警计算机系统的可靠性提高到0.999 97。

In order to effectively suppress the possible common mode failure of computer system software and hardware, analysis is made to dissimilar redundant technology and its redundant architecture and the number of redundancy based on the redundancy technology.The design and implementation of a dissimilar dual redundant alarm computer are discussed from such aspects of the hardware/software architecture design, hot-standby switching logic and so on.The fault tree analysis method is used for analyzing and calculating the reliability of the system based on the experimental data.The results show that: The use of dissimilar dual redundant technology can effectively suppress the common mode failures of software and hardware system, and improve the reliability of the airborne warning computer system to 0.999 97.