航空电子音视频传输AVB以太网络

摘要

航空电子网络上音视频应用的需求日益剧增,对网络的带宽及服务质量都提出了更高的要求.音视频传输AVB(Audio Video Bridge)以太网络在传统以太网上提供时间同步和低延迟的音视频流服务,因而受到航电应用的关注.分析了AVB 协议,针对航电环境下信息交换需解决的问题,提出了时间触发AVB 网络方案,研究了其实时性传输机制和流量映射等模型;结合某综合航电系统的案例,构建了AVB 网络的系统架构,仿真结果表明时间触发AVB 网络有望满足分布式综合模块化航空电子(DIMA)系统实时性需求,并且比AFDX 网络具有优越性.%The demand for audio/video applications in avionics network is increasing rapidly. There are highly requirements for network bandwidth and quality of service. Audio/Video Bridging ( AVB ) technology can provide a synchronized and low-latency audio/video service in traditional Ethernet network, and therefore it has received attention in avionics applications. On the basis of analyzing AVB protocol, a time-triggered AVB transmission mechanism is proposed with the real-time guarantee and a traffic mapping model for message exchange in avionics network. The system architecture of AVB is constructed as a case study for an integrated avionics system. The simulation results indicate that the time-triggered AVB is expected to meet transfer needs in DIMA and is superior to AFDX.