CAN总线在运载火箭控制系统中的应用分析

CAN Bus Application Analysis in Launch Vehicle Control System

随着总线技术发展以及“航班化运输”对低成本、高可靠电气系统的需求日益增强,现场总线(Field Bus)逐渐受到航天领域的青睐。CAN总线作为应用最广泛的现场总线之一,已在导弹和火箭中有一定研究与应用,考虑到运载火箭与导弹的不同,针对CAN总线在运载火箭控制系统中的应用进行阐述。分析了研究必要性,并分别给出了适用于中大型、小型运载火箭的典型CAN拓扑,相应介绍了CAN中继技术以及CAN总线重构技术,随后结合某新一代运载火箭总线实际传输数据码流进行了CAN总线效率与负载率计算,并与同等条件下1553B总线进行了比较,其结果可为运载火箭电气系统设计人员提供更直接的参考。

With the development of data bus technology and the increasing demand for low-cost and high-reliability electrical systems in"flight-based transportation",Field Bus(FB)is gradually favored by the aerospace field.Controller Area Network(CAN),one of the most widely used field buses,has been researched and applied in missiles and tactical rockets.Considering the differences between launch vehicles and missiles,the application of CAN bus in launch vehicle control systems is expounded.The necessity of research is firstly analyzed,then typical CAN topologies suitable for medium and large-scale launch vehicles are given respectively.For the aim of practical use,two corresponding technologies are introduced which are the CAN relay technology and the CAN bus reconstruction.The efficiency and load rate of CAN bus are calculated which are then compared with the ones derived by 1553B data transmission under the same conditions.These results can be referenced by designers in a more accurate sense.