Abstract:
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.