The New Generation System of Japan Standard Time at NICT

Author

Hanado, Yuko ; Imamura, Kuniyasu ; Kotake, Noboru ; Nakagawa, Fumimaru ; Shimizu, Yoshiyuki ; Tabuchi, Ryo ; Lam, Quoc Tung ; Takahashi, Yukio ; Hosokawa, Mizuhiko ; Morikawa, Takao

Author_Institution

Nat. Inst. of Inf. & Commun. Technol., Tokyo

fYear

2007

fDate

May 29 2007-June 1 2007

Firstpage

378

Lastpage

384

Abstract

NICT has completed a new generation system for the realization of Japan standard time. There are various renewals in this system. One of the big changes is the introduction of hydrogen masers as signal sources for UTC(NICT) instead of Cs atomic clocks. This greatly improves the short-term stability of UTC (NICT). Another big change is the introduction of a newly developed 24ch dual-mixer-time-difference system (DMTD) as the main tool for measurements. The reliability of the system is also improved by enhanced redundancy and monitoring systems. The new JST system is in regular operation since February 2006.

Keywords

masers; standards; time measurement; Japan Standard Time; NICT; dual-mixer-time-difference system; hydrogen masers; new generation system; signal sources; system reliability; Atomic clocks; Communication standards; Communications technology; Frequency; Hydrogen; Masers; Monitoring; Redundancy; Stability; Time measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency Control Symposium, 2007 Joint with the 21st European Frequency and Time Forum. IEEE International

Conference_Location

Geneva

ISSN

1075-6787

Print_ISBN

978-1-4244-0646-3

Electronic_ISBN

1075-6787

Type

conf

DOI

10.1109/FREQ.2007.4319101

Filename

4319101