Title :
New timekeeping system and its time link calibration at NIM
Author :
Liang Kun ; Zhang Aimin ; Wang Weibo ; Ning Dayu ; Gao Yuan ; Yang Zhiqiang ; Zhao Kejia ; Zhang Yue ; Liu Kun ; Long Bo
Author_Institution :
Div. of Time & Freq. Metrol., Nat. Inst. of Metrol., Beijing, China
Abstract :
NIM has started to switch formally generating of UTC(NIM) to the new campus since Oct 14th 2012. After that, 6 H-masers (Symmetricom MHM-2010) and 7 industrial Cs clocks (Symmetricom 5071A) at the two campuses have been involved in TAI corporation. One calibration of the time transfer link between National Institute of Metrology (NIM), P. R. China, and Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany, has been implemented successfully and based on this, BIPM has aligned TWSTFT (Two Way Satellite Time and Frequency Transfer) link to GPS link for calibration of TWSTFT link. From the Cir.T, for UTC(NIM) the link uncertainty of type B has been maintained as 5.2 ns.
Keywords :
calibration; time measurement; Braunschweig; H-masers; NIM; National Institute of Metrology; PR China; PTB; Physikalisch-Technische Bundesanstalt; Symmetricom 5071A; Symmetricom MHM-2010; TAI corporation; UTC; industrial Cs clock; time transfer link calibration; timekeeping system; Calibration; Charge coupled devices; Clocks; Global Positioning System; Receivers; Time-frequency analysis; Uncertainty; GNSS; calibration; time link; timekeeping;
Conference_Titel :
Frequency Control Symposium (FCS), 2014 IEEE International
Conference_Location :
Taipei
DOI :
10.1109/FCS.2014.6859896
