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针对分布式综合模块化航空电子(IMA)体系结构,在时间、空间分区以及带宽分区的基础上,提出了网络分区的概念,并建立了相应的网络模型、消息模型、流量模型及调度模型。利用网络演算方法,推导了航空电子混合消息集在网络分区下端到端(ETE)延迟的计算公式;搭建典型网络,通过理论计算对比了网络分区与带宽分区的实时性能。计算结果表明:网络分区下两条硬实时数据流的延迟较带宽分区分别降低了33.5%和74.2%;而弱硬实时与软实时数据流的延迟增加约30%。最后通过OPNET仿真对理论分析所得结果进行了验证,证明网络分区方法符合分布式IMA的分布式架构要求,并满足了系统混合关键性的需求。
Aiming at the distributed and integrated modular avionics (IMA) architecture, the concept of network partitioning is proposed based on time, space partitioning and bandwidth partitioning. Corresponding network models, message models, traffic models and scheduling models are established. Using the network calculus method, the calculation formula of ETE delay of avionics mixed message set in network partitioning is deduced. A typical network is constructed, and the real-time performance of network partitioning and bandwidth partitioning is contrasted theoretically. The calculation results show that the delay of the two hard real-time data streams under the network partition is reduced by 33.5% and 74.2% respectively compared with the bandwidth partitioning, while the delay of the weak hard real-time and soft real-time data streams is increased by about 30%. Finally, through the OPNET simulation, the theoretical analysis results verify that the network partitioning method meets the distributed architecture requirements of distributed IMA and meets the key requirements of system blending.