论文部分内容阅读
航空电子全双工交换式以太网(AFDX,Avionics Full Duplex SwitchedEthernet)是新一代大型飞机机载网络的首选方案,构建其上的航空电子系统应保证强实时应用在时限内完成.针对现有AFDX实时性研究仅给出网络延迟上界的不足,综合考虑了任务的响应时间以及实时消息在AFDX网络中的传输延迟.建立了使用AFDX网络的航空电子系统模型,分析了分布式任务序列的整体时间需求.应用全局分析思想,给出任务序列的最坏情况响应时间,为系统实时性的评价和优化提供了理论依据.仿真结果表明该分析给出了紧凑的任务序列响应时间上界.
Avionics Full Duplex Switched Ethernet (AFDX, Avionics Full Duplex SwitchedEthernet) is the preferred solution for a new generation of large aircraft onboard networks, and the avionics system built on it should ensure strong real-time applications to be completed within the timeframe.For existing AFDX Real-time research only gives the shortcomings of the upper bound of network delay, considering the response time of the task and the transmission delay of real-time message in the AFDX network.An avionic system model using AFDX network is established, and the whole distributed task sequence Time requirement.The application of the global analysis idea gives the worst case response time of the task sequence and provides a theoretical basis for the evaluation and optimization of the real-time performance of the system.The simulation results show that this analysis gives a compact upper bound of the response time of the task sequence.