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随着综合航电系统的发展,1553B总线已经不能满足发展的需要,光纤通道交换式网络作为新一代高性能网络通信协议被引入到航电系统中,其性能指标与整个航电系统的总体指标有着密切的关系。为了解决系统消息实时发送的问题,研究了光纤通道交换网络实时条件下加权轮询调度算法的通信性能,利用随机Petri网对光纤通道交换网络的调度过程进行了建模,通过对模型的仿真和分析,得到了数据传输量及传输时限变化时系统网络负载、延迟时间、超时消息所占比例等重要性能指标,并分析了调度算法的性能。仿真结果证明光纤通道交换式网络具有高速稳定性,加权轮询调度算法能够满足消息传输的实时性、公平性要求。
With the development of integrated avionics system, the 1553B bus can no longer meet the development needs. As a new generation of high-performance network communication protocol, Fiber Channel switched networks are introduced into the avionics system. Its performance indicators and the overall indicators of the avionics system There is a close relationship. In order to solve the problem of real-time transmission of system messages, the communication performance of weighted round robin scheduling algorithm in Fiber Channel switched networks is studied. The scheduling of Fiber Channel switched networks is modeled using stochastic Petri nets. The important performance indexes such as system network load, delay time and the proportion of time-out messages are obtained when the data transmission and transmission time vary. The performance of the scheduling algorithm is also analyzed. The simulation results show that the Fiber Channel switched network has high speed stability and the weighted round robin scheduling algorithm can meet the real-time and fairness requirements of message transmission.