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Frontiers in Signal Processing
FSP > Volume 3, Number 4, October 2019

An Ultrahigh Precision Network Time Synchronization Technology

Download PDF  (505.6 KB)PP. 82-92,  Pub. Date:October 10, 2019
DOI: 10.22606/fsp.2019.34004

Author(s)
Yu Quan, Liangfu Peng, Yongqing He
Affiliation(s)
College of Electrical & Information Engineering, Southwest Minzu University, Chengdu, China
College of Electrical & Information Engineering, Southwest Minzu University, Chengdu, China
College of Electrical & Information Engineering, Southwest Minzu University, Chengdu, China
Abstract
For clock synchronization, how to realize sub-nanosecond time synchronization in Ethernet is a technical problem. White Rabbit (WR) time synchronization is a new time synchronization technology developed on the basis of Precision Time Protocol (PTP). WR is based on Gigabit Ethernet, using physical layer clock distribution technology to achieve clock frequency distribution; using PTP to achieve timestamp synchronization; using digital dual mixer time difference (DDMTD) phase detector to improve the synchronization precision of timestamp to subnanoseconds. This paper introduces the WR network hierarchical topology; focuses on the special link delay mode of WR and the specific process and steps of the synchronization implementation, and deduces the link delay and offset; analyzes the key techniques of WR time synchronization technology; finally describe the application and development prospects of this technology at home and abroad. WR can improve the accuracy of time synchronization to the sub-nanosecond level, which can be widely used in important fields such as communication, navigation, electricity, industry and national defense construction.
Keywords
White Rabbit, Precision Time Protocol, Digital Dual Mixer Time Difference, Ethernet.
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