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基于光纤以太网的高精度分布式授时技术
龚光华,李鸿明
0
(清华大学 工程物理系,粒子技术与辐射成像教育部重点实验室,北京 100084)
摘要:
White Rabbit(WR)时钟同步技术是综合了同步以太网、精密定时协议(IEEE1588 v2)和数字相位测量技术而发展的分布式同步授时技术,能够实现数千米范围内多节点亚纳秒精度的时钟分发。该技术兼容标准以太网协议,不占用额外网络带宽,与数据链路直接集成,结构简单成本低。介绍了White Rabbit技术的基本技术原理及初步应用方法,并给出了各种拓扑结构下的测试结果。采用White Rabbit能很好地解决各种长距离多节点高精度授时需求,能够作为地基增强导航系统的关键支撑技术。
关键词:  分布式同步  分布式授时  同步以太网  White Rabbit
DOI:
基金项目:国家自然科学基金(11275111,11575096)
High-Precision Time Distribution Based on Optical Etherne
GONG Guang-hua,LI Hong-ming
(Key Laboratory of Particle and Radiation Imaging of Ministry of Education, Department of Engineering Physics, Tsinghua University, Beijing 100084, China)
Abstract:
WR (White Rabbit) is a technology that combined the Gigabit Ethernet, SyncE, Precision Time Protocol (IEEE1588 v2) and digital phase tracking method to provide a subnanosecond accuracy of time & frequency distribution method for thousands of devices spanning several kilometers. WR technology is compatible with standard Ethernet, introduces very few network bandwidth load, high integration with data transmission and advantage of low cost. This paper introduces the technical principles of WR technology, the measurement results of a small WR network with different topology are presented as well. The WR technology is an ideal solution for all applications that requires high precision time synchronization among multiple nodes over long distance, to act as a key supporting technology for the thriving ground enhancement navigation system.
Key words:  Distributed synchronization  Time distribution  Sync-E  White Rabbit

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