时间触发以太网确定性调度设计与研究

Time-triggered Ethernet Deterministic Scheduling Design and Research

随着航空航天领域电子系统向分布式发展,对机载网络高带宽、低延迟、高可靠性的要求越来越严格。传统的CAN、ARINC429等总线正在逐渐被AFDX、TTP、TTE等新一代航空总线技术代替。针对TTE交换式网络,设计了一种新的兼容时间触发流量和标准的事件触发流量的TTE以太网交换机方案,保证了时间触发流量的延时是可控的,并且固定在一定的范围内;经wireshark、Iperf3等软件测试检验了交换机的交换速率、抖动和丢包率;经modelsim软件仿真,并在FPGA硬件实验板上通过嵌入式逻辑分析仪和示波器检验了时间触发流量传输的可靠性、延迟范围和时间同步精度,根据同步周期的不同使同步精度达到了μs级、ns级。

With the distributed development of electronic systems in the aerospace industry, the requirements for high bandwidth, low latency and high reliability of airborne networks are becoming more and more strict. Traditional Controller Area Network(CAN), ARINC429 and other buses are gradually being replaced by Avionics Full Duplex switched ethernet (AFDX), Time-Triggered Protocol (TTP), Time triggered Ethernet (TTE),which are a new generation of aviation bus technology. For the TTE switched network, a new TTE Ethernet switch solution compatible with time-triggered traffic and standard event-triggered traffic is designed. It guarantees that the time-triggered traffic delay is controllable and fixed in a certain range. The switching rate, jitter and packet loss rate of the switch were verified by software tests such as wireshark and Iperf3. The simulation was performed by modelsim, and the reliability, delay range and time synchronization accuracy of the time-triggered traffic transmission was verified by embedded logic analyzer and oscilloscope on the FPGA hardware experiment board., the synchronization accuracy is achieved in the us and ns levels according to the synchronization period.