基于CAN总线的立方星分布式计算机设计

摘要

为提高立方星系统的整体可靠性以及在轨时间,结合立方星的限制,提出了一种适用于立方星的分布式计算机设计方案.在分析一般卫星容错方案的基础上,为解决系统单点故障对整星可靠性的影响,设计了基于CAN总线的立方星分布式应用层协议,实现了故障子系统的功能转移;利用马尔科夫理论对该系统方案进行了可靠性建模分析.分析结果表明,该方案能够提高系统的整体可靠度和立方星的工作寿命.%In order to improve the reliability of cubesat system and the time in orbit,according to the characteristics of the cubesat,this paper proposes the design of distributed computer which is suitable for the cubesat.Through analysis of typical fault-tolerant of the cubesats,an application-layer protocol is designed based on CAN bus to realize the transfer function of the fault subsystem.Besides,Markov theory is used to do the reliability modeling analysis.The result shows that the scheme can be used to improve the overall reliability of the whole system and the service life of the cubesat.