优先级驱动的泛化航电网络实时性能分析

Switching networks make use of the structure of air separation switching to increase the overall communication capacity remarkably, and have therefore become a typical means for interconnecting new generation avionics systems.Generalized network calculus can be used to predict the real-time performance of switching networks according to typical network features.However, generalized network calculus lacks the means to analyze the real-time performance of the networks which distinguish high and low priority.On the basis of abstracting the features of the priority control strategy for switched networks, the priority-driven generalized network calculus models the high and low priority streams using the network calculus theory.Under the boundary constraint of the burst envelope function, the end-to-end delay-bound analysis of different priority proportions is completed, and the priority ratio scheme is given.In the typical airborne network topology, the model proposed is verified experimentally with a randomly generated case.The results show that compared with the calculus using detailed traffic configuration, the calculus proposed is 33% more effective, and can realize performance prediction of airborne switched networks based on network features.