一种可实现高精度时间同步的数据传输方法  

A Data Transmission Method for High Precision of Time Synchronization

作　　者：杨冯帆 常劲帆[1,2] 王铮 YANG Fengfan;CHANG Jinfan;WANG Zheng(State Key Laboratory of Particle Detection and Electronics,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院高能物理研究所核探测与核电子学国家重点实验室,北京100049 [2]中国科学院大学物理科学学院,北京100049

出　　处：《计算机工程》2020年第2期118-125,133,共9页Computer Engineering

基　　金：国家自然科学基金(11390385)

摘　　要：KM2A探测器阵列是高海拔宇宙线观测站(LHAASO)的主体探测器阵列之一,近7000个探测器平均分布在1.3 km 2的实验范围内。针对大面积分布式布局的高能物理实验中读出电子学系统的时间同步和数据传输问题,提出一种可实现高精度时间同步的数据传输方法。借助TCP/IP协议栈和White Rabbit时钟同步技术融合时钟网络与数据网络,TCP/IP协议栈在仅保留PC通信协议的基础上,无需增加额外硬件,即可实现高效可靠的数据传输和高精度时钟同步。测试结果表明,该方法可以实现探测器阵列内LHAASO KM2A读出电子学插件间时间同步精度优于1 ns,同时保证了数据传输的可靠性。KM2A is one of the main detector arrays of Large High Altitude Air Shower Observatory(LHAASO).Nearly 7000 detectors are evenly distributed in the experimental area of 1.3 km 2.To address problems in time synchronization and data transmission for readout electronics in such a large-scale distributed high energy physical experiment,this paper proposes a data transmission method for high precision of time synchronization.This method uses TCP/IP protocol stack and White Rabbit technology to integrate clock network with data network.TCP/IP protocol stack is slimmed down to its PC communication protocol here,and can realize efficient and reliable data transmission and high-precision clock synchronization without any extra hardware added.Test results show that this method improves time synchronization precision of LHAASO KM2A readout electronics module to less than 1 ns,and ensures the reliability of data transmission.

关 键 词：高海拔宇宙线观测站 时间同步 TCP/IP协议 现场可编程门阵列 硬件描述语言 

分 类 号：TN919[电子电信—通信与信息系统]