Time Triggered Ethernet (TTE) is a real-time network communication technology based on standard Ethernet.It uses "clock synchronization" and "time trigger" to ensure the real-time and deterministic communication of key data."Clock synchronization" is based on the overall system.The standard of the clock periodically corrects the time information and frequency deviation of various device clocks on the system communication network,so that it is limited to a small enough range to ensure the synchronous operation of the system,so that it can meet the strong requirements of safety-critical systems.Real-time communication requirements,this paper analyzes the optimized synchronization algorithm theoretically based on the SAE AS6802 protocol,and completes the end-to-end time synchronization of time-triggered Ethernet boards through this algorithm,and the accuracy is guaranteed to be better than 100 ns.
Key words
time-triggered ethernet /
protocol control frame /
time synchronization algorithm
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References
[1] Kopetz H,Ademaj A,Grilinger P,et al.The TimeTriggered Ethernet(TTE) Design[C]//Eighth IEEE International Symposium on ObjectOriented RealTime Distributed Computing.IEEE Computer Society,2005:2233.
[2] 程博文,刘伟伟,何熊文,等.猎户座飞船电子系统设计特点分析与启示[J],航天器工程,2016,25(4):102107.
[3] STEINBACH T,LIM H T,KORF F,et al.Tomorrow’s incar interconnect?A competitive evaluation of IEEE 802.1 AVB and timetriggered ethernet (AS6802)[C]//Vehicular Technology Conference Quebec City:IEEE,2012:15.
[4] SAE AS6802.TimeTriggered Ethernet[S].SAE Aerospace Standard,2011.
[5] IEEE Standard for a Precision Clock Synchronization Protocol for Networked Measurement and Contorl Systems,2002.
[6] Andreas Dreher,DirkMohl.Precision Clock SynchronizationIEEE1588White Paper,2004.
[7] 兰杰,熊华钢,李峭.时间触发以太网时钟同步的容错方法分析[J].计算机工程与设计,2015,36(1):1116.
[8] S Amin,R Obermaisser.Timetriggered scheduling of query executions for active diagnosis in distributed realtime systems[C]//2017 22nd IEEE International Conference on Emerging Technologies and Factory Automation(ETFA),Limassol,Cyprus,2017:19.
[9] A Murshed,M Abuteir,R Obermaisser.Validation Framework for TimeTriggered SystemofSystems[C]//2017 International Conference on Promising Electronic Technologies (ICPET),Deir ElBalah,2017:103108.
[10] A Murshed,R Obermaisser.Scheduler for reliable distributed systems with timetriggered networks[C]//2017 IEEE 15th International Conference on Industrial Informatics (INDIN),Emden,2017:425430.
[11] 宋梓旭,李峭,汪晶晶,等.基于可调度性排序的时间触发调度表生成方法[J].北京航空航天大学学报,2018,44(11):23882395.
[12] 王家兴.时间触发以太网关键技术研究与设计[D].杭州:浙江大学,2019.
[13] 周俊.基于时间触发以太网的 AS6802时间同步协议的设计与实现[D].西安:西安电子科技大学,2018.
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