Recommendation 2 of the 20th CCTF (2015)

Predictions of UTC disseminated by Global Navigation Satellite Systems (GNSS)

The Consultative Committee for Time and Frequency (CCTF),

considering that

  • the task of the BIPM is to ensure world-wide uniformity of measurements and their traceability to the International System of Units (SI),
  • two GNSS already exist and others are under development,
  • at least two additional GNSS – BeiDou and Galileo – currently offer or are close to offering services,
  • Section 5 of BIPM Circular T publishes the relationship between UTC/TAI and the predictions of UTC(k) disseminated by GPS and GLONASS;

aims to

  • facilitate access for any user to real-time predictions of UTC disseminated by existing and future GNSS;

recommends that

  • Section 5 of BIPM Circular T be retitled “Relations of UTC and TAI with predictions of UTC disseminated by GNSS”, and adds similar information on new GNSS as they become operational.

The reader should note that the official version of this Resolution is the French text

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