一种星载强容错SpaceWire总线网络拓扑设计与分析

Design and analysis of a strong fault-tolerant on-board SpaceWire bus network

目前SpaceWire总线应用主要基于单个路由器上连接数个节点设备,构成小型星状网络结构,而对复杂航天器多节点情况下的SpaceWire网络系统应用研究较少。针对航天器高可靠要求,提出一种总线型网络拓扑容错设计方案,对网络工作方式、多层次冗余容错机制、系统可靠度和网络传输性能进行了分析推导,结果表明提出的网络拓扑满足星载应用要求。最后根据分析结果提出了SpaceWire网络系统中数据包长、链路速率和节点布局的设计指导原则。

SpaceWire bus is nowadays mainly used in the way that a few nodes are connected to a central router, forming a small star topology. Research on SpaceWire network with large number of nodes in complicated satellite is rare yet. A bus type topology of SpaceWire network was proposed concerning the high reliability demand of spacecraft. Operation principle and hierarchical fault-tolerant scheme of this network were analyzed, reliability and communication performance were also derived.The results indicate that the network topology satisfies requirements of spacecraft application. Design rules of packet length,link data rate and nodes layout in SpaceWire network were provided to support planning on-board SpaceWire network.