摘要
航空电子的综合化、模块化和网络化是新一代航电系统的特点。基于以太网技术的AFDX(Avionics Full Duplexed Ethernet)具有强实时性、高可靠性和延迟确定性等特点,普遍应用于航空领域如空客公司的A380,A350,A400M以及波音公司的B787等机型上。为此美国航空无线电公司定义了一种航空专用以太网的通信协议标准——ARINC 664 Part7,该协议是IEEE802.3的一个子集。SkewMax参数应用于AFDX网络终端系统的余度管理中,它表示接收到的一帧的两个复本之间的最大的时间间隔,是影响AFDX网络性能的重要因素。介绍了机载通信网络的发展以及AFDX网络的产生,并概括了AFDX网络的特点,然后对ARINC 664 Part7协议中关于SkewMax的内容进行了深层次剖析,并针对终端系统的接收端多个虚链路,多个SN(Sequence Nubmer)号余度帧之间的SkewMax的测量,提出了一种有效的解决办法,对于AFDX网络的设计和测试有一定参考价值。
Synthesis and modularization of the avionics and the network-oriented message transmission is the characteristics of the new generation avionics system.Based on the Ethernet technology,the AFDX（Avionics Full Duplexed Ethernet） has the feature of strong real-time,high reliability,latency assurance and so on,it has been widely used in the Airbus A380,A350,A400M and Boeing B787.Therefore,the ARINC（Avionics Radio Co.） defines an avionics specified Ethernet communication protocol standard-ARINC 664 Part 7,which is a subset of the IEEE802.3. The SkewMax parameter is used in the redundancy management of the AFDX end system,it indicates the maximum time interval between the two copies of a received AFDX frame.SkewMax is the significant factor which influences the network performance.Above all,introduce the development of the avionics communication networks as well as the emergence and summarize traits of AFDX.Then it analyzes the SkewMax issue regarding the contents in the ARINC 664 Part7 in depth and puts forward an effective solution in allusion to the measurement of the SkewMax for multi-virtual links and multi-sequence number between the received frame copies.It also has some reference value to AFDX network design and test.
出处
《计算机技术与发展》
2010年第6期249-253,共5页
Computer Technology and Development
基金
2009年陕西省电子信息产业振兴和改造项目(陕发改高技[2009]317号)
