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Front. Inform. Technol. Electron. Eng.  2013, Vol. 14 Issue (10): 766-776    DOI: 10.1631/jzus.C1300084
    
IEEE 1588 based time synchronization system for a seafloor observatory network
De-jun Li, Gang Wang, Can-jun Yang, Bo Jin, Yan-hu Chen
State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China
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Abstract  An IEEE 1588 based application scheme was proposed to achieve accurate time synchronization for a deep seafloor observatory network based on the communication topological structure of the Zhejiang University Experimental and Research Observatory. The principles of the network time protocol (NTP) and precision time protocol (PTP) were analyzed. The framework for time synchronization of the shore station, undersea junction box layer, and submarine science instrument layer was designed. NTP and PTP network signals were decoded by a PTP master clock on a shore station that receives signals from the Global Positioning System and the BeiDou Navigation Satellite System as reference time sources. These signals were remotely transmitted by a subsea optical–electrical composite cable through an Ethernet passive optical network. Accurate time was determined by time synchronization devices in each layer. Synchronization monitoring experiments performed within a laboratory environment indicated that the proposed system is valid and has the potential to realize microsecond accuracy to satisfy the time synchronization requirements of a high-precision seafloor observatory network.

Key wordsSeafloor observatory network      Junction box      IEEE 1588      Time synchronization     
Received: 09 April 2013      Published: 08 October 2013
CLC:  TP393  
Cite this article:

De-jun Li, Gang Wang, Can-jun Yang, Bo Jin, Yan-hu Chen. IEEE 1588 based time synchronization system for a seafloor observatory network. Front. Inform. Technol. Electron. Eng., 2013, 14(10): 766-776.

URL:

http://www.zjujournals.com/xueshu/fitee/10.1631/jzus.C1300084     OR     http://www.zjujournals.com/xueshu/fitee/Y2013/V14/I10/766


IEEE 1588 based time synchronization system for a seafloor observatory network

An IEEE 1588 based application scheme was proposed to achieve accurate time synchronization for a deep seafloor observatory network based on the communication topological structure of the Zhejiang University Experimental and Research Observatory. The principles of the network time protocol (NTP) and precision time protocol (PTP) were analyzed. The framework for time synchronization of the shore station, undersea junction box layer, and submarine science instrument layer was designed. NTP and PTP network signals were decoded by a PTP master clock on a shore station that receives signals from the Global Positioning System and the BeiDou Navigation Satellite System as reference time sources. These signals were remotely transmitted by a subsea optical–electrical composite cable through an Ethernet passive optical network. Accurate time was determined by time synchronization devices in each layer. Synchronization monitoring experiments performed within a laboratory environment indicated that the proposed system is valid and has the potential to realize microsecond accuracy to satisfy the time synchronization requirements of a high-precision seafloor observatory network.

关键词: Seafloor observatory network,  Junction box,  IEEE 1588,  Time synchronization 
[1] Jun Wang, De-jun Li, Can-jun Yang, Zhi-feng Zhang, Bo Jin, Yan-hu Chen. Developing a power monitoring and protection system for the junction boxes of an experimental seafloor observatory network[J]. Front. Inform. Technol. Electron. Eng., 2015, 16(12): 1034-1045.