AFDX虚连接自适应调度策略设计与实现

摘要

The Virtual link scheduling method of AFDX (Avionics Full Duplex Switched Ethernet) is researched. Aiming at the uncertain problem of AFDX network, a Preemptive scheduling strategy is proposed based on the compound priority, the algorism can dynamic and in Real-time calculate the compound priority, considering the avionics urgent data and traffic shaping demand, and can dynamically adjust the scheduling algorism, balance the network load, inhibit the jitter in the transmission and improve the performance of AFDX, having the high priority compared with the traditional FCFS algorism. The method can satisfy the in —real data transmission demand.%研究了航空电子全双工交换式以太网端系统虚连接调度方法；针对AFDX网络的不确定性问题,提出了一种基于混合优先级的动态抢占式的虚连接调度策略,该算法在调度的过程中,实时地动态计算混合优先级,综合考虑了航电紧急数据和流量整形的要求,能动态地自适应调整调度算法,平衡网络负载；通过OPNET仿真工具对实例进行仿真,结果显示此算法能明显地减少网络延迟,抑制传输过程中的抖动现象,提高AFDX数据传输性能,较传统FCFS算法具有较高的优越性,能满足航空电子数据传输实时性要求.