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浙江大学学报(工学版)
J4  2014, Vol. 48 Issue (1): 1-7    DOI: 10.3785/j.issn.1008-973X.2014.01.001
    
NTP/IEEE1588-based time synchronization system in seafloor observatory network
LI De-jun,WANG Gang,YANG Can-jun,JIN Bo,CHEN Yan-hu
State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China
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Abstract  

An application scheme based on network time protocol (NTP) and IEEE1588（PTP）was proposed to achieve accurate time synchronization for deep seafloor observatory network according to the communication topological structure. The principles of NTP and IEEE1588 were analyzed. The frameworks for time synchronization of shore station, undersea junction box layer and submarine observation instrument layer were designed. NTP and PTP synchronous signals were decoded by PTP master clocks on shore station. PTP master clocks received signals from GPS/Beidou double navigation satellite systems as reference time source.NTP and PTP synchronous signals were remote transmitted by deep sea optic electric composite cable through Ethernet passive optical network. Accurate time can be achieved by time synchronization devices in each layer. The laboratory environment synchronization monitoring experiments were performed. PPS signal time synchronization can reach a precision of less than 500 ns; NTP time synchronization can reach a precision of less than 400 μs; PTP time synchronization can reach a precision of less than 3 μs.

Published: 01 January 2014
CLC:  TP 393  
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Cite this article:

I De-jun,WANG Gang,YANG Can-jun,JIN Bo,CHEN Yan-hu. NTP/IEEE1588-based time synchronization system in seafloor observatory network. J4, 2014, 48(1): 1-7.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2014.01.001     OR     http://www.zjujournals.com/eng/Y2014/V48/I1/1


基于NTP和IEEE1588海底观测网时间同步系统

为了实现深海海底观测网时间同步,针对海底观测网通信网络拓扑结构,提出基于网络时间协议(NTP)和IEEE1588协议的时间同步应用方案.介绍NTP和IEEE1588(PTP)协议时钟同步原理.设计岸基站、接驳盒层、观测仪器层进行时间同步的硬件结构.该系统以岸基站PTP主时钟接收到的GPS/北斗双参考源的卫星信号为时间源,解码输出NTP同步信号和PTP同步信号经由光纤以太网通过深海光电复合缆进行远程传输,利用各层时间同步装置获取精确时间.开展实验室环境下的时间同步监测实验.结果表明，PPS信号时间同步精度小于500 ns,NTP时间同步精度小于400 μs,PTP时间同步精度小于3 μs.

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