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CCTF-K001.UTC
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CCTF-K001.UTC
Information
Metrology area, branch   Time and Frequency, Time
Description   Calculation of the reference time scale UTC (Coordinated Universal Time)
Time of measurement   1977 -
Status   Ongoing, approved for equivalence, Results available
Reference(s)   Guidelines for participation in the ongoing key comparison in time CCTF-K001.UTC
Metrologia, 2003, 40, 184-188
Proc. 30th PTTI, 1998, 393-404
Proc. 32nd PTTI, 2001, 181-194
Proc. 32nd PTTI, 2001, 195-209
Proc. IEEE/EIA FCS, 2000, 586-597
Monographie BIPM 94/1, BIPM Publications, 1994, 52 pages
Measurand   [UTC - UTC(k)] in ns
UTC(k) is the local representation of UTC maintained by the laboratory k
Transfer device(s)   Time transfer between participants is carried out using Global Positioning System (GPS) and Two-Way Satellite Time and Frequency Transfer (TWSTFT)
Comparison type   Key comparison
Consultative Committee  CCTF (Consultative Committee for Time and Frequency)
Conducted by   CCTF (Consultative Committee for Time and Frequency)
Comments  

Values are available every 5 days on MJD's ending by "4" and "9" (MJD: Modified Julian Day).
They are published in the monthly Circular T and in the BIPM Time Section Annual Report (see Results).
The laboratories listed in the page Participants are those which contributed to the last issue of Circular T.  

At its 17th meeting in September 2006, the CCTF decided to assign the identifier "CCTF-K001.UTC" to this key comparison, first registered as "CCTF-K2001.UTC" in January 2005 (see page 28 of the Report of the 17th CCTF meeting).
This was implemented in the KCDB on 19 March 2007.