小卫星星载CAN总线的应用层传输方法研究  

CAN Bus Application Layer Process in Small Satellite

作　　者：陶志刚[1] 李晴[1] 

机构地区：[1]航天东方红卫星有限公司,北京100094

出　　处：《航天器工程》2011年第3期103-107,共5页Spacecraft Engineering

基　　金：863日地环境组网监测与实验技术(2008AA12A216)

摘　　要：数据总线是小卫星上各模块之间的主要数据传输通道,充分利用现场总线技术,选择合适的数据总线标准,改善数据总线应用的标准设计,提高可靠性,将工业、商业总线技术引入航天领域是小卫星数据总线未来的发展方向。小卫星星上控制局域网(CAN)总线网络组成包括物理层、数据链路层和应用层。文章分析了小卫星星上网络的应用层协议的基本组成,以及将应用层数据包组织成为适合在CAN总线上进行传输的帧格式的方法,描述了星上CAN总线网络的数据帧结构,阐述了仲裁域、控制域、数据域的基本设置。文章提出了一种基于优先级对CAN总线数据帧进行发送和接收的星载网络传输方法;给出了CAN总线数据帧数据域中的有效数据、通信的源地址、目标地址在CAN数据帧中的结构设置,提出了利用CAN总线的多主特性,基于优先级的发送和接收处理CAN总线数据帧的方法,能够满足通信实时性和大数据量的传输要求。Data bus is the main information transmission between small satellite modules.Using field area bus to select suitable data bus standard,improving application design and reliability,and bringing industrial and commercial data bus technology into spaceflight are the development trend to data bus in small satellites.Control area network（CAN） bus in small satellite has three layers,physical layer,data link layer and application layer.The paper introduces the application layer of CAN bus in small satellite and the method to form the data transmitting frame;it also describes the setting of arbitration field,control field and data field.The paper gives a method of data sending and receiving based on the property of the multi-master.It also introduces the net data structure in data package and the positions of source address,and target address in CAN frame,designs every identify data（ID） segment,including priority,address,assistant type,and multiple frame mark,and forms the application layer into CAN frame.The paper advances a new method that uses the multi-master,based on the priority to receiving and sending data,and can satisfy the requirements of real time and large capacitance of data.

关 键 词：控制局域网总线 应用层 优先级 数据帧 设计 

分 类 号：V443.1[航空宇航科学与技术—飞行器设计]