Timekeeping Of NTSC in Recent Years

Haibo Yuan and Lili Qu

Abstract:	Since 2004, the National Time Service Center of Chinese Academy of Sciences (NTSC) has been greatly improving in the number of atomic clocks, time comparison system, remote time transfer system, and so on. With the improvement of frequency control technology for the master atomic clock, the accuracy and stability of the Coordinated Universal Time UTC (NTSC) have also noticeably increased. From 2008 to 2009, the deviation between UTC (NTSC) and UTC has been less than 20 ns. The middle-term and long-term stability of the local atomic time TA (NTSC) has also been greatly improved. In this paper, the timekeeping system of NTSC and the remote Time Transfer System (GNSS CV and TWSTFT) are introduced first, and then the algorithm of TA (NTSC) is briefly described. The performance of the timekeeping system is discussed after an introduction to the hardware and local atomic time algorithm. Finally, we discuss the accurate and stability of UTC (NTSC) and TA (NTSC) by using the actual data of UTC -UTC (NTSC) and TAI - TA (NTSC) in recent years, which are downloaded from the BIPM Web site. The result of the discussion shows that the timekeeping technology and the time scale algorithm of NTSC have been improved in recent years.
Published in:	Proceedings of the 42nd Annual Precise Time and Time Interval Systems and Applications Meeting November 15 - 18, 2010 Hyatt Regency Reston Town Center Reston, Virginia
Pages:	51 - 58
Cite this article:	Yuan, Haibo, Qu, Lili, "Timekeeping Of NTSC in Recent Years," Proceedings of the 42nd Annual Precise Time and Time Interval Systems and Applications Meeting, Reston, Virginia, November 2010, pp. 51-58.
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