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民用飞机综合化航空电子系统普遍采用高带宽的确定性网络ARINC664作为主干网,但是部分设备仍然采用ARINC825、ARINC429等低速低成本的总线,通过远程数据接口单元(RDIU)连接到主干网,因此构成了混杂的机载网络拓扑。针对混杂网络中子网之间数据传输的通信延时问题,分析了RDIU的数据转发策略,对子网之间的端到端传输延时的构成进行了研究,结果表明其具有确定性的特征。基于OMNe T++仿真环境进行网络节点模型和网络系统模型的设计,采用网络仿真的方式分析了端到端传输延时的概率密度和累积概率密度,与确定性分析结果一致。
Commercial aircraft integrated avionics systems generally use the ARINC664 high-bandwidth deterministic network as a backbone, but some devices still use low-speed, low-cost buses such as ARINC825 and ARINC429 to connect to the backbone through remote data interface units (RDIUs) A mixed airborne network topology. According to the communication delay problem of data transmission between subnetworks in hybrid networks, the RDIU data forwarding strategy is analyzed and the composition of end-to-end transmission delay between subnets is studied. The results show that it has deterministic characteristics . Based on OMNe T ++ simulation environment, the node model and network system model are designed. The probability density and cumulative probability density of end-to-end transmission delay are analyzed by network simulation, which is consistent with the result of deterministic analysis.