时间触发以太网(TTE)是一种基于标准以太网的实时网络通信技术,采用“时钟同步”和“时间触发”来确保关键数据的通信实时性和确定性,“时钟同步”就是基于系统全局时钟的标准,周期性地修正系统通信网络上各种设备时钟的时间信息和频率偏差,使其限定在足够小的范围内,保证系统同步运行的过程,从而使其能够满足安全关键系统的强实时通信需求。本文根据SAE AS6802协议在理论上分析出其优化后的同步算法后,通过该算法完成了时间触发以太网板卡端对端时间同步,并保证精度优于100 ns。
Abstract
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.
关键词
时间触发以太网 /
协议控制帧 /
时间同步算法
Key words
time-triggered ethernet /
protocol control frame /
time synchronization algorithm
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基金
*国家自然科学基金青年科学基金(51705475)。
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