– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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FTP server of the BIPM Time Department
Circular T
Other products
Links results
Hardware delay characterization
Annual Reports

The BIPM organizes the international network of time links to compare local realizations of UTC in contributing laboratories and uses them in the calculation of TAI. The network of time links used by the BIPM is non-redundant and relies on observation of GNSS satellites and on two-way satellite time and frequency transfer (TWSTFT).

Monthly timelinks and their comparisons are computed by the BIPM Time Department and results can be found below. (For a better understanding of the files content and naming convention, you are invited to read the documentation.)

Time links results (monthly)

Results of monthly PPP solutions processed using NRCan can be obtained here.
Documentation can be found here.

Other international metrology data centres:

International metrology publications
SI Brochure
Guides in metrology
Circular T
Recommended values of standard frequencies
Related articles
International reference timescales
Recent publications of the BIPM Time Department