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中文摘要：
机载计算机是无人机的核心部件，其可靠性高低直接决定了系统的安全；余度技术作为机载计算机可靠性设计的一项重要手段，对提高系统的应变能力，实现故障隐蔽以消除故障，改善系统性能有十分重要的作用；但是在余度技术中不同通道之间会存在一定的时钟误差，如果不进行处理将会使其无法达到无缝切换，从而影响系统的安全；在对机载计算机内部通道间不同步的原因进行详细分析的基础上，提出了一种软、硬件相结合的同步算法，并以三余度机载计算机为例进行了实际测试；测试结果证明该策略实现简单、同步效果好，异步度完全满足系统要求且付出的软、硬件代价小，显著提高了全系统的可靠性及可维护性。
英文摘要：
The airborne computer is the core component of the UAV,the reliability of the airborne computer influences the survival abil-ity of the whole system.Redundant technology is an important method in airborne computer reliability design.It can improve the adaptability of system,realize avoiding malfunction by error concealment,improve system performance.But there are clock error between different chan-nels,the seamless switching can’t be realized and the system safety will be affected with it.Based on the analysis of non-synchronization be-tween each channels in airborne computer,a synchronization method of software and hardware is put forward.A detailed algorithm design of the tri-redundancy structure in airborne computer is given.The method and strategy is effective to system synchronize,the system asynchro-nization is satisfied the requirement through actual test with low cost of software and hardware.The reliability and maintainability of system have been improved.
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