双模冗余器载计算机设计与实现

Design and implementation of dual redundant space on-board computer system

摘要:

器载计算机是航天器电气系统的重要组成部分，其可靠性对航天器能否完成任务至关重要。为了保证航天器上计算机在出现故障时仍能正常工作，对双机冗余器载计算机的体系结构、切换策略、判别准则等内容进行了研究，在保留主份机与双机切换电路、备份机与双机切换电路之间的状态工作信号的基础上，通过在主份机、备份机之间新增加一个状态工作信号，提出了一种改进的自主切换策略。实践表明，运用改进的自主切换策略，在双机切换电路中的自主切换模块出现故障时仍能实现自主切换，同时将比较器设计为软件，采用软件表决、软件选通的思路，消除了硬件比较器的关键单点故障，这些容错设计改进能有效地提高器载计算机系统的可靠性，对高可靠器载计算机设计与实现具有较好的工程参考意义。

Abstract:

On-board computer system has a significant role in spacecraft electronic system,and its reliability is especially essential to achieve final mission. In this paper, system architecture, switch method and estimation rule are introduced, then presents a modified independence switch method and maneuver basing on software design. Practice indicates that the redundant technology can effectively improve the reliability of space on-board computer system, and the paper has engineering application value for design and implementation of space on-board computer system with high reliability.