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- 2017
机载时间触发光网络的设计与实时性分析
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Abstract:
摘要 波分复用光（WDM）网络是目前较好的航空电子网络解决方案之一，具有高带宽、强灵活性、对协议和比特率透明、强扩展性等优点。但在实时性方面，WDM网络的消息传输存在不确定性，无法满足未来航空电子网络对于时间关键消息强实时性保障的要求。本文将时间触发机制引入WDM网络，设计了时间触发航空电子WDM （TTAWDM）网络的体系结构，包含协议栈、消息类型、调度流程等。TTAWDM用时刻调度表规划时间关键性消息的传输，保障消息传输过程和传输延时的确定性，以满足强实时性要求。在TTAWDM体系结构设计的基础上分析了网络消息的实时性，基于网络演算推导出速率限制消息的延时上界计算方法，并构造仿真实验展示了TTAWDM对于强实时性保障，同时验证了延时上界计算方法的有效性。
Abstract：Wavelength division multiplexing (WDM) network is featured by almost unlimited bandwidth potential, great flexibility, strong expandability and transparent to protocol and bit rate, which makes it a good choice for avionics systems. However, the end-to-end delay of message transmitted on WDM avionics is uncertain on the real-time performance. WDM network cannot ensure determinacy for the time-critical message transmitted on future avionics network. This paper introduces time-triggered mechanism to WDM network and proposes the architecture of time-triggered avionics WDM (TTAWDM) network, including protocol layer, data format, scheduling procedure, etc. The time-triggered mechanism can process a statically configured communication schedule for time-critical message, which can ensure determinacy for the transmission process and end-to-end delay of message, and can meet real-time requirements. Then the real-time property of messages is analyzed based on the architecture design of TTAWDM, and based on network calculus, the calculation method of upper bound delay of rate-constrained messages is given. Finally, a simulation experiment of TTAWDM is conducted, and the results show that TTAWDM can be a totally deterministic network for time-critical messages and the calculation method of upper bound delay is effective.
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