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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.
- z = 3: direct links, e.g. through RF cables or optical fibres; 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. |
Version |
Last updated |
Year |
Cal_ID |
Type of Calibration |
Other info. |
Version |
Last updated |
2011 |
0211-2011 |
TW |
CH |
|
January 8, 2016 |
2011 |
0214-2011 |
TW |
NIST |
|
January 8, 2016 |
2011 |
0220-2011 |
TW |
VSL |
|
January 8, 2016 |
2012 |
0281-2012 |
TW |
SU |
|
April 8, 2015 |
2012 |
0284-2012 |
TW |
CH |
v1.0 |
January 7, 2016 |
2012 |
0284-2012 |
TW |
CH |
v2.0 |
December 12, 2017 |
2015 |
0295-2015 |
TW |
VSL |
v1.0 |
January 7, 2016 |
2015 |
0295-2015 |
TW |
VSL |
v2.0 |
December 12, 2017 |
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 |
v1.0 |
August 26, 2015 |
2015 |
0393-2015 |
TW |
NIST |
v2.0 |
December 12, 2017 |
2016 |
0395-2016 |
TW |
USNO |
v1.0 |
October 11, 2016 |
2016 |
0395-2016 |
TW |
USNO |
v2.0 |
December 12, 2017 |
2016 |
0417-2016 |
TW |
NIM |
|
October 10, 2016 |
2016 |
0418-2016 |
TW |
NTSC |
|
October 10, 2016 |
2016 |
0434-2016 |
TW |
IT |
|
December 12, 2017 |
2016 |
0434-2016 |
TW |
IT |
v1.0 |
April 3, 2017 |
2016 |
0434-2016 |
TW |
IT |
v2.0 |
December 12, 2017 |
2016 |
0437-2016 |
TW |
OP |
v1.0 |
April 3, 2017 |
2016 |
0437-2016 |
TW |
OP |
v2.0 |
December 12, 2017 |
2016 |
0440-2016 |
TW |
ROA |
v1.0 |
April 3, 2017 |
2016 |
0440-2016 |
TW |
ROA |
v2.0 |
December 12, 2017 |
2016 |
0441-2016 |
TW |
SP |
v1.0 |
April 3, 2017 |
2016 |
0441-2016 |
TW |
SP |
v2.0 |
December 12, 2017 |
2017 |
0449-2017 |
TW |
AOS |
v1.0 |
August 16, 2017 |
2017 |
0449-2017 |
TW |
AOS |
v2.0 |
December 12, 2017 |
2017 |
0450-2017 |
TW |
NPL |
v1.0 |
August 16, 2017 |
2017 |
0450-2017 |
TW |
NPL |
v2.0 |
December 12, 2017 |
2018 |
0487-2018 |
TW |
GPS-TL-NICT |
v1.0 |
April 5, 2019 |
2019 |
0489-2019 |
TW |
ROA |
v1.0 |
November 18, 2019 |
2019 |
0496-2019 |
TW |
SP |
v1.0 |
November 19, 2019 |
2019 |
0502-2019 |
TW |
IT |
v1.0 |
November 19, 2019 |
2019 |
0503-2019 |
TW |
OP |
v1.0 |
November 19, 2019 |
2019 |
0504-2019 |
TW |
ROA |
v1.0 |
November 19, 2019 |
2019 |
0505-2019 |
TW |
IT |
v1.0 |
November 19, 2019 |
2019 |
0506-2019 |
TW |
ROA |
v1.0 |
November 19, 2019 |
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 |
GPSP3C1 |
Initial-Group1-trip |
|
April 25, 2018 |
2014 |
1001-2014 |
GPSP3 |
Initial-Group1-trip |
|
August 1, 2016 |
2016 |
1001-2016 |
GPSP3C1 |
Group1-trip |
|
October 24, 2017 |
2016 |
1001-2016 |
GPSP3C1 |
Group1-trip |
V1.5 |
July 12, 2018 |
2018 |
1001-2018 |
GPSP3C1 |
Group1-trip |
V1.1 |
November 30, 2018 |
2018 |
1001-2018 |
GPSP3C1 |
Group1-trip |
V1.2 |
December 10, 2018 |
2018 |
1001-2018 |
GPSP3C1 |
Group1-trip |
V1.3 |
March 25, 2019 |
2018 |
1001-2018 |
GPSP3C1 |
Group1-trip |
V1.4 |
March 27, 2019 |
2018 |
1001-2018 |
GPSP3C1 |
Group1-trip |
V1.5 |
July 24, 2019 |
2018 |
1001-2018 |
GPSP3C1 |
Group1-trip |
V1.6 |
October 21, 2019 |
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 |
2017 |
1011-2017 |
GPSP3 |
CNM-CNMP |
V1.0 |
December 2, 2019 |
2018 |
1011-2018 |
GPSP3 |
HKO-SCL |
V1.0 |
July 23, 2019 |
2018 |
1011-2018 |
GPSP3 |
HKO-SCL |
V1.1 |
August 8, 2019 |
2019 |
1011-2019 |
GPSP3C1 |
IMBH |
V1.0 |
July 16, 2019 |
2012 |
1012-2012 |
P3 |
ESTC |
|
April 8, 2015 |
2016 |
1012-2016 |
GPSP3 |
DLR-METAS-VSL-BEV |
|
October 7, 2016 |
2016 |
1012-2016 |
GPSP3 |
DLR-METAS-VSL-BEV |
V2.0 |
March 16, 2018 |
2018 |
1012-2018 |
GPSP3 |
LUX |
V1.0 |
March 30, 2018 |
2019 |
1012-2019 |
GPSP3 |
DTAG |
V1.0 |
October 23, 2019 |
2012 |
1013-2012 |
P3 |
NIM |
|
April 8, 2015 |
2016 |
1013-2016 |
GPSP3 |
INRIM-SP |
|
March 21, 2017 |
2016 |
1013-2016 |
GPSP3 |
INRIM-SP |
V1.1 |
August 31, 2018 |
2017 |
1013-2017 |
GPSP3C1 |
NIMT-NMLS-VMI |
|
September 27, 2017 |
2018 |
1013-2018 |
GPSP3C1 |
NPLI |
V1.0 |
September 28, 2018 |
2016 |
1014-2016 |
GPSP3 |
NTSC |
|
July 5, 2017 |
2017 |
1014-2017 |
GPSP3C1 |
NPL-SMD |
|
August 30, 2017 |
2018 |
1014-2018 |
GPSP3C1 |
AOS-PL-LT |
V1.0 |
September 26, 2018 |
2016 |
1015-2016 |
GPSC1P3 |
BIRM |
|
May 19, 2017 |
2017 |
1015-2017 |
GPSP3 |
DTAG |
|
August 31, 2017 |
2018 |
1015-2018 |
GPSP3 |
CNES |
V1.0 |
August 6, 2019 |
2018 |
1015-2018 |
GPSP3 |
CNES |
V1.1 |
October 22, 2019 |
2019 |
1015-2019 |
GPSP3C1 |
NPL-TP |
V1.0 |
November 28, 2019 |
2017 |
1016-2017 |
GPSP3 |
IFAG |
V1.0 |
July 9, 2018 |
2018 |
1016-2018 |
GPSP3C1 |
NTSC-BIRM |
V1.0 |
July 25, 2019 |
2016 |
1017-2016 |
GPSP3 |
NRC |
|
January 18, 2017 |
2017 |
1017-2017 |
GPSP3C1 |
KRISS |
|
September 28, 2017 |
2018 |
1017-2018 |
GPSP3C1 |
KIM-LIPI |
V1.0 |
May 29, 2019 |
2017 |
1018-2017 |
GPSP3 |
ORB |
|
September 29, 2017 |
2018 |
1018-2018 |
GPSP3 |
NMISA |
V1.0 |
January 4, 2019 |
2016 |
1019-2016 |
GPSP3 |
ESTEC |
|
April 27, 2017 |
2017 |
1019-2017 |
GPSP3 |
NRC |
V1.0 |
July 6, 2018 |
2018 |
1019-2018 |
GPSP3 |
MASM-SG |
V1.0 |
July 17, 2019 |
2017 |
1020-2017 |
GPSP3C1 |
SASO |
V1.0 |
February 1, 2018 |
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 |
2016 |
1101-2016 |
GPSP3 |
CNES |
V2.0 |
March 27, 2018 |
2017 |
1101-2017 |
GPSP3C1 |
JV |
V1.0 |
July 27, 2018 |
2015 |
1102-2015 |
GPSP3 |
MIKES |
|
March 23, 2016 |
2016 |
1102-2016 |
GPSP3 |
ZA |
|
October 7, 2016 |
2017 |
1102-2017 |
GPSP3C1 |
TP |
V1.0 |
January 30, 2018 |
2017 |
1102-2017 |
GPSP3C1 |
TP |
V1.1 |
April 10, 2019 |
2018 |
1201-2018 |
GPSP3 |
JATC |
V1.0 |
September 3, 2018 |
2019 |
1201-2019 |
GPSP3C1 |
NPLI-TC |
V1.0 |
August 28, 2019 |
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 |
2017 |
2001-2017 |
CA |
ICE |
|
August 17, 2017 |
2018 |
2001-2018 |
GPSP3C1 |
IMBH |
|
February 18, 2019 |
2019 |
2001-2019 |
GPSP3 |
VMI |
|
July 30, 2019 |
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 |
|
June 1, 2018 |
2018 |
2002-2018 |
GPSP3C1 |
DMDM |
|
April 16, 2019 |
2008 |
2003-2008 |
CATW |
BEV |
|
January 7, 2016 |
2011 |
2003-2011 |
CA |
UA |
|
April 8, 2015 |
2012 |
2003-2012 |
CA |
KZ |
|
May 6, 2015 |
2013 |
2003-2013 |
CA |
UME |
|
April 8, 2015 |
2014 |
2003-2014 |
CA |
IMBH |
|
April 7, 2015 |
2016 |
2003-2016 |
GPSP3C1 |
INPL |
|
June 1, 2018 |
2017 |
2003-2017 |
GPSP3C1 |
NPLI |
|
March 2, 2018 |
2017 |
2003-2017 |
GPSP3C1 |
NPLI |
V2.0 |
April 5, 2018 |
2008 |
2004-2008 |
CA |
BIM |
|
April 8, 2015 |
2012 |
2004-2012 |
CA |
IMBH |
|
April 7, 2015 |
2014 |
2004-2014 |
CA |
BOM |
|
April 20, 2016 |
2016 |
2004-2016 |
CA |
IMBH |
|
January 13, 2017 |
2017 |
2004-2017 |
GPSP3C1 |
NPLI |
|
March 2, 2018 |
2014 |
2005-2014 |
CA |
IGNA |
v1.0 |
April 4, 2018 |
2017 |
2005-2017 |
GPSP3C1 |
NPLI |
|
February 26, 2018 |
2019 |
2007-2019 |
GPSP3C1 |
BIM |
|
May 10, 2019 |
2017 |
3001-2017 |
LK |
JATC-NTSC |
v1.0 |
January 3, 2018 |
 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.
 |
 |
|
|
- GPS_P3_under_way
|
April 8, 2015 |
- P3_calib_AUS
|
April 8, 2015 |
- P3_calib_CH
|
April 8, 2015 |
- P3_calib_DLR
|
April 8, 2015 |
- P3_calib_IFAG
|
April 8, 2015 |
- P3_calib_IT
|
April 8, 2015 |
- P3_calib_KRIS
|
April 8, 2015 |
- P3_calib_NICT
|
April 8, 2015 |
- P3_calib_NIM
|
April 8, 2015 |
- P3_calib_NMIJ
|
April 8, 2015 |
- P3_calib_NRC
|
April 8, 2015 |
- P3_calib_ONRJ
|
April 8, 2015 |
- P3_calib_OP
|
April 8, 2015 |
- P3_calib_ORB
|
April 8, 2015 |
- P3_calib_PTB
|
April 8, 2015 |
- P3_calib_ROA
|
April 8, 2015 |
- P3_calib_SG
|
April 8, 2015 |
- P3_calib_SP
|
April 8, 2015 |
- P3_calib_TCC
|
April 8, 2015 |
- P3_calib_TL
|
April 8, 2015 |
- P3_calib_TP
|
April 8, 2015 |
- READ_ME
|
April 8, 2015 |
|
 |
 ARCHIVE
Please note that the information displayed on this web page is frozen as at 1 November 2014.
|  |