Title :
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
fDate :
May 29 2007-June 1 2007
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;
Conference_Titel :
Frequency Control Symposium, 2007 Joint with the 21st European Frequency and Time Forum. IEEE International
Conference_Location :
Geneva
Print_ISBN :
978-1-4244-0646-3
Electronic_ISBN :
1075-6787
DOI :
10.1109/FREQ.2007.4319101
