Time and Frequency Dissemination System for Synchronization Applications at TL

Jia-Lun Wang and Chia-Shu Liao

Abstract:	In this paper, we propose a new generation of time and frequency dissemination system using Global Navigation Satellite System (GNSS) dual frequency receiver for the purpose of both time and frequency synchronization. The system can be used as a timing source, remote time and frequency calibration, and to monitor the characteristic of primary reference time clock in the telecommunication networks. A series of experiments, based on GPS common-view and all-in-view methods, were conducted to evaluate the performance of the system. The common-view common-clock test using hydrogen maser clock as reference was studied for the evaluation of the system noise level. The tests of short-baseline about 20 km between Chunghwa Telecommunication Laboratories (TL) and telecommunication facilities, and long-baseline around 10,000 km between TL and MSL (Measurement Standards Laboratory, New Zealand) were performed. Experimental results indicate that expanded time and frequency uncertainty of the proposed system with a coverage factor of k=2 are less than 26 ns and 1.1 x10-13 (one day averaging), respectively. It also shows that both timing and frequency accuracy of the system conforms to ITU-T G.811 and G.8272 requirements as a Primary Reference Time Clock for phase, time and frequency synchronization applications.
Published in:	Proceedings of the ION 2015 Pacific PNT Meeting April 20 - 23, 2015 Marriott Waikiki Beach Resort & Spa Honolulu, Hawaii
Pages:	985 - 992
Cite this article:	Wang, Jia-Lun, Liao, Chia-Shu, "Time and Frequency Dissemination System for Synchronization Applications at TL," Proceedings of the ION 2015 Pacific PNT Meeting, Honolulu, Hawaii, April 2015, pp. 985-992.
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