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为保证COTS平台下的航空电子应用在航空电子全双工以太网(AFDX)上的时间确定性接入,设计了AFDX网络实时流量的中间件接入模型。通过基于中间层驱动过滤机制的协议转换,实现了双边网络的协议对接,并给出了帧顺序号(SN)的插入方法;通过对虚拟链路(VL)在时间上进行有效分配,避免了速率受限的数据流对物理链路的争用,在实现单条VL的BAG整形基础上提出了使实时流量抖动最小的VL复合时间调度算法。搭建典型实验环境对该模型进行仿真实验,结果表明,中间件模型能准确地实现数据帧TCP/IP协议与AFDX协议格式的相互转换,且该时间调度算法大大减小了VL复合所产生的抖动,保证了数据流传输的时间确定性。
In order to ensure the time-definite access of avionics applications on AFNX in COTS platform, a middleware access model of AFDX network real-time traffic is designed. Through the protocol conversion based on the middle layer driving filtering mechanism, the protocol interworking of the bilateral network is realized, and the inserting method of frame sequence number (SN) is given. By effectively allocating the virtual link (VL) in time, The contention of rate-limited data streams on physical links is proposed based on the BAG shaping of a single VL to minimize the real-time traffic jitter VL composite time scheduling algorithm. A typical experimental environment is set up to simulate the model. The simulation results show that the middleware model can accurately convert the data frame TCP / IP protocol and AFDX protocol format, and the time scheduling algorithm can greatly reduce the jitter generated by the VL composite , To ensure the time certainty of data stream transmission.