FC-AE-1553网络传输性能评价

为了提高航天航空网络传输性能,提出一种通用的FC-AE-1553网络传输效率计算方法并研制高性能FC-AE-1553节点卡.首先,对FC-AE-1553网络的消息传输过程进行详细分析,分析信息类型,给出传输帧的格式建议,通过分析FC-AE-1553协议中各类消息传输的时间参数,结合FC标准中对通信时间的要求,提出FC-AE-1553网络交换中各种消息类型的通信时间计算公式.然后,针对无差错传输和有差错传输两种情况,给出了网络传输效率的计算方法.最后,通过仿真分析数据帧净荷长度、节点处理时间、交换中序列数量、传输误码率、丢包率等参数对FC-AE-1553网络传输效率的影响,给出了网络优化设计的建议.依托某航天工程任务,研制了基于XC5VFX100T和MPC8536E的FC-AE-1553节点卡.实验结果表明:丢包对传输效率的影响可忽略;数据帧净荷为2048 B,数据帧数量为16时,传输效率可达到77.2%.

Evaluation of network transmission performance in FC-AE-1553

In order to improve the aerospace network transmission performance, a general network transmission efficiency calculation method based on FC-AE-1553 network was proposed and a FC-AE-1553 node card was designed. Firstly, a detailed message transmission process analysis based on FC-AE-1553 network was established, message types were analyzed, and transmission frame format proposals were given. By the time parameter analysis of all kinds of message transmission, combing the requirements of communication time in FC standard, the calculation formula of communication time was proposed in all kinds of FC-AE-1553 network exchange types. Then, calculation method of the network transmission efficiency was given according to two cases of the error free transmission and error transfer. Finally, through simulation and analysis of the effect of data frame payload length, node processing time, sequence number of exchange, transmission error rate, packet loss rate, and other parameters on transmission efficiency in FC-AE-1553 network, the design suggestions of optimizing the network were presented. Supported by an aerospace engineering task, a FC-AE-1553 node card was developed based on XC5VFX100T and MPC8536E. The experimental results indicate the packet loss rate influence on the transmission efficiency can be neglected, and the transmission efficiency is 77.2% when the data frame payload length is 2 048 B and the data frame number is 16.