计算机工程

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时间触发AFDX调度设计及实时性分析

焦文喆1,翟正军1,王国庆1,2   

  1. (1.西北工业大学 计算机学院,西安 710129; 2.中国航空无线电电子研究所,上海 200233)
  • 收稿日期:2015-11-03 出版日期:2016-07-15 发布日期:2016-07-15
  • 作者简介:焦文喆(1985-),男,博士研究生,主研方向为航电网络、网络存储安全;翟正军、王国庆,教授、博士、博士生导师。
  • 基金项目:
    国家“973”计划基金资助项目(2014CB744900)。

Scheduling Design and Instantaneity Analysis of Time-triggered AFDX

JIAO Wenzhe 1,ZHAI Zhengjun 1,WANG Guoqing 1,2   

  1. (1.School of Computer Science,Northwestern Polytechnical University,Xi’an 710129,China; 2.China National Aeronautical Radio Electronics Research Institute,Shanghai,200233,China)
  • Received:2015-11-03 Online:2016-07-15 Published:2016-07-15

摘要: 针对时间触发航空电子全双工交换式以太网(TTAFDX)的特点,设计基于帧长度优先原则的系统调度策略,解决时间触发虚拟链路的调度问题。搭建典型网络,采用网络演算方法对TTAFDX和使用静态优先级调度策略的AFDX进行实时性比较,结果表明,TTAFDX中时间触发虚拟链路的延迟主要由固定延迟部分组成,而速率限制虚拟链路的实时性较AFDX中的低优先级虚拟链路也有所提高,证明TTAFDX调度策略在兼容AFDX的同时能够改善网络的时间确定性,适用于具有硬实时传输要求的航空电子系统。

关键词: 分布式综合模块化航空电子, 航空电子全双工交换式以太网, 时间触发, 调度策略, 实时性分析

Abstract: According to the characteristics of Time-triggered Avionics Full Duplex Switched Ethernet(TTAFDX),this paper proposes a scheduling strategy based on frame-length priority to solve the scheduling problem of Time-triggered Virtual Link(TTVL).It builds a typical network,and compares the instantaneities of TTAFDX and AFDX which uses Static Priority(SP) scheduling strategy.The result shows that,the delay of TTVL consists mainly of fixed delay,and the instantaneity of Rate Constraint Virtual Link(RCVL) is also improved compared with the low-priority VL in AFDX,which demonstrates that the scheduling strategy of TTAFDX can enhance the time-deterministic feature of the network while being compatible with AFDX.It can be implemented in the avionics system with hard real-time transmission requirement.

Key words: Distributed Integrated Modular Avionics(DIMA), Avionics Full Duplex Switched Ethernet(AFDX), time-triggered, scheduling strategy, instantaneity analysis

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