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BIPM calibrations of time transfer equipment


The BIPM Time Department manages the calibration of time transfer systems used to generate UTC. Calibrations may be carried out by the BIPM, by the RMOs, by individual time laboratories or, in some cases, by other entities such as manufacturers. These pages give access to the calibration results and reports for all techniques contributing to UTC.

Starting 2015, calibrations in laboratories contributing to UTC follow specific guidelines. For more information please click on the Documentation tab above.

Current calibration results (available via the "Current files" tab above) are labelled with a calibration identifier (Cal_ID) to enable the process yielding the results to be traced. The Cal_ID is used to report calibration information in Section 5 of Circular T; an example is given here.

The calibration identifiers are of the form znnn-YYYY where

  • z identifies the type of calibration;
  • nnn is a number assigned by the BIPM;
  • YYYY indicates the year (typically the start of the calibration exercise).

The types of calibration are:

  • z = 0: For TWSTFT links, whatever the technique used for the link calibration. nnn then is the calibration identification of the ITU format.
  • z = 1: For GNSS systems, with GNSS calibration campaigns under the supervision of the BIPM; nnn then identifies a report corresponding to a calibration trip; see details in the GNSS Guidelines.
  • z = 2: For GNSS systems, calibrated with other techniques (e.g. manufacturer calibration, absolute calibration, or transfer using a calibrated link); nnn then identifies a report and is a sequential number within the year.

Calibrations made before 2014 have been included in the current scheme by assigning a Cal_ID when a full report is available. The history of calibrations until 2014 can also be accessed in its original form through the "Archive" tab above.

Starting 2015, GNSS and TWSTFT calibrations in UTC contributing laboratories are organized as follows:

    The GNSS calibration scheme is a hierarchical system.

    The BIPM will organize the calibration of some laboratories (called "Group 1") in each Regional Metrology Organization, and the RMOs, together with these "Group 1" laboratories, will organize calibration campaigns for the other laboratories of their region (called "Group 2"). Guidelines will assure that the calibration processes will all be consistent with those implemented at the BIPM. See the GNSS Guidelines for more information. See a short description of the calibration procedure in the Readme file and a list of upcoming calibration exercises here.

    The TWSTFT calibrations are organized by the TWSTFT stations contributing to UTC following the Guidelines for TWSTFT link calibrations.

Year Cal_ID Type of
Calibration
Other info. Last updated
Year Cal_ID Type of
Calibration
Other info. Last updated
2011 0214-2011 TW NIST January 8, 2016
2012 0281-2012 TW SU April 8, 2015
2012 0284-2012 TW CH January 7, 2016
2015 0295-2015 TW VSL January 7, 2016
2014 0374-2014 TW Europe-IT June 2, 2015
2014 0377-2014 TW Europe-OP June 2, 2015
2014 0380-2014 TW Europe-ROA June 2, 2015
2014 0381-2014 TW Europe-SP June 2, 2015
2014 0391-2014 TW USNO April 8, 2015
2015 0392-2015 TW USNO January 7, 2016
2015 0393-2015 TW NIST August 26, 2015
2016 0395-2016 TW USNO October 11, 2016
2016 0417-2016 TW NIM October 10, 2016
2016 0418-2016 TW NTSC October 10, 2016
1993 1001-1993 CA 199305 April 8, 2015
2003 1001-2003 P3 NRC April 8, 2015
2004 1001-2004 CA 200802 April 8, 2015
2005 1001-2005 P3 TL April 8, 2015
2007 1001-2007 P3 DLR April 8, 2015
2008 1001-2008 P3 PTB April 8, 2015
2009 1001-2009 P3 SP April 8, 2015
2010 1001-2010 P3 SG April 8, 2015
2011 1001-2011 P3 TCC April 8, 2015
2012 1001-2012 P3 ORB April 8, 2015
2014 1001-2014 GPSP3 Initial-Group1-trip August 1, 2016
2016 1001-2016 GPSP3C1 Group1-trip February 9, 2017
2003 1002-2003 CA 200406 April 8, 2015
2004 1002-2004 CA 200803 April 8, 2015
2005 1002-2005 P3 NMIJ April 8, 2015
2007 1002-2007 P3 IT April 8, 2015
2008 1002-2008 P3 OP April 8, 2015
2009 1002-2009 P3 TP April 8, 2015
2010 1002-2010 P3 AUS April 8, 2015
2005 1003-2005 P3 KRIS April 8, 2015
2008 1003-2008 P3 CH April 8, 2015
2009 1003-2009 P3 ONRJ April 8, 2015
2005 1004-2005 CA 200804 April 8, 2015
2008 1004-2008 P3 ROA April 8, 2015
2008 1005-2008 CA 201004 April 8, 2015
2006 1007-2006 CA 201002 April 8, 2015
2006 1008-2006 CA 201003 April 8, 2015
2007 1011-2007 CA EIM April 8, 2015
2010 1011-2010 P3 NPL April 8, 2015
2011 1011-2011 P3 IFAG April 8, 2015
2012 1011-2012 P3 ESTC April 8, 2015
2016 1011-2016 GPSP3 BIM-UME-BOM-DMDM-IMBH-INRIM January 17, 2017
2012 1012-2012 P3 ESTC April 8, 2015
2016 1012-2016 GPSP3 DLR-METAS-VSL-BEV October 7, 2016
2012 1013-2012 P3 NIM April 8, 2015
2016 1017-2016 GPSP3 NRC January 18, 2017
2013 1101-2013 GPSP3 AOS-GUM March 23, 2016
2015 1101-2015 GPSP3 ESOC March 23, 2016
2016 1101-2016 GPSP3 CNES September 15, 2016
2015 1102-2015 GPSP3 MIKES March 23, 2016
2016 1102-2016 GPSP3 ZA October 7, 2016
2006 2001-2006 CA SMU April 8, 2015
2008 2001-2008 CA BY April 8, 2015
2009 2001-2009 CA INPL April 8, 2015
2011 2001-2011 CA ONRJ April 8, 2015
2012 2001-2012 CA HKO April 8, 2015
2013 2001-2013 CA MTC April 8, 2015
2014 2001-2014 CA AOS April 8, 2015
2015 2001-2015 CA NIMB January 26, 2016
2016 2001-2016 CA UAE January 9, 2017
2008 2002-2008 CA KZ April 8, 2015
2011 2002-2011 CA SMD April 8, 2015
2012 2002-2012 CA HKO February 25, 2014
2012 2002-2012 CA IMBH April 7, 2015
2013 2002-2013 CA SASO April 8, 2015
2014 2002-2014 CAP3 SIQ April 8, 2015
2015 2002-2015 CA CNMP May 11, 2016
2016 2002-2016 GPSP3C1 INPL January 9, 2017
2008 2003-2008 CATW BEV January 7, 2016
2011 2003-2011 CA UA April 8, 2015
2013 2003-2013 CA UME April 8, 2015
2014 2003-2014 CA IMBH April 7, 2015
2016 2003-2016 GPSP3C1 INPL January 9, 2017
2008 2004-2008 CA BIM April 8, 2015
2014 2004-2014 CA BOM April 20, 2016
2016 2004-2016 CA IMBH January 13, 2017
ARCHIVE

Please note that the information displayed on this web page is frozen as at 1 November 2014.

Differential time corrections for GPS time equipment are published in Rapports BIPM.

  • AOS
  • April 8, 2015
  • PTB
  • April 8, 2015
  • SU
  • April 8, 2015
ARCHIVE

Please note that the information displayed on this web page is frozen as at 1 November 2014.

Differential time corrections for GPS time equipment are published in Rapports BIPM.

  • AOS
  • April 8, 2015
  • APL
  • April 8, 2015
  • AUS
  • April 8, 2015
  • BEV
  • April 8, 2015
  • BIM
  • April 8, 2015
  • CH
  • April 8, 2015
  • CNM
  • April 8, 2015
  • CNMP
  • April 8, 2015
  • DMDM
  • April 8, 2015
  • DTAG
  • April 8, 2015
  • HKO
  • April 8, 2015
  • IGNA
  • April 8, 2015
  • IPQ
  • April 8, 2015
  • IT
  • April 8, 2015
  • KRIS
  • April 8, 2015
  • LT
  • April 8, 2015
  • MKEH
  • April 8, 2015
  • MSL
  • April 8, 2015
  • NICT
  • April 8, 2015
  • NIMB
  • April 8, 2015
  • NIST
  • April 8, 2015
  • NMIJ
  • April 8, 2015
  • NML
  • April 8, 2015
  • NPL
  • April 8, 2015
  • NRC
  • April 8, 2015
  • NTSC
  • April 8, 2015
  • OCA
  • April 8, 2015
  • ONBA
  • April 8, 2015
  • PL
  • April 8, 2015
  • PTB
  • April 8, 2015
  • ROA
  • April 8, 2015
  • SCL
  • April 8, 2015
  • SG
  • April 8, 2015
  • SP
  • April 8, 2015
  • SU
  • April 8, 2015
  • TCC
  • April 8, 2015
  • TL
  • April 8, 2015
  • TP
  • April 8, 2015
  • TUG
  • April 8, 2015
  • USNO
  • April 8, 2015
  • VSL
  • April 8, 2015
  • _TM155_BEV_GPS-TW_Calib
  • April 8, 2015
ARCHIVE

Please note that the information displayed on this web page is frozen as at 1 November 2014.

ARCHIVE

Please note that the information displayed on this web page is frozen as at 1 November 2014.