(1. National Time Service Centre, Chinese Academy of Sciences, Xi′an 710600, China;
2. Key Laboratory of Precision Navigation and Timing Technology, National Time Service Center,
Chinese Academy of Science, Xi′an 710600, China;
3. University of Chinese Academy of Science, Beijing 100039, China)
Abstract:For further improving synchronization precision, a compensation for the frequency drift of the slave clock should be introduced in the application of IEEE1588 precision time protocol. In this paper, following an introduction of the time synchronization process of IEEE1588 and the added content of the IEEE1588(Second Edition), a method of frequency drift compensation is demonstrated and a time synchronization system is established based on IEEE1588 for verifying the compensation method. The experiments indicate that the method is helpful to improve the synchronization precision in various internet environments and can satisfy the high precision time synchronization demand of some fields such as electric power and measurement /control.
Key words: IEEE1588; frequency drift compensation; hardware-timestamp
2009 National Time Service Center (NTSC), Chinese Academy of Sciences , All Rights Reserved