小卫星星载CAN总线的应用层传输方法研究

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,...

CAN Bus Application Layer Process in Small Satellite

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.