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Commission 31: Time: (L’Heure)

Extract

The CCTF (formerly named CCDS) held its 14th meeting on 20-22 April 1999. Following the discussions, seven Recommendations were adopted and submitted to the Comité International des Poids et Mesures (CIPM). The list is the following:

  1. 1. Recommendation S 1 (1999): Mise-en-pratique of the definition of the second.
  2. 2. Recommendation S 2 (1999): On stating uncertainty in comparisons involving primary frequency standards.
  3. 3. Recommendation S 3 (1999): On the comparison of primary frequency standards.
  4. 4. Recommendation S 4 (1999): On the use of multi-channel and multi-code GPS and GLONASS time receivers.
  5. 5. Recommendation S 5 (1999): Time and frequency comparisons using GPS phase and code measurements.
  6. 6. Recommendation S 6 (1999): Future global navigation satellite systems.
  7. 7. Recommendation S 7 (1999): On Two-Way Satellite Time and Frequency Transfer

Additionally discussed were the present form of UTC and mostly the interest of preserving the leap second. The advantages and disadvantages of several options regarding the future use of leap seconds were compared. The CCTF, however, felt that it did not have the authority to propose any action. Then CCTF decided to ask the BIPM Director to write to the relating international bodies including IAU so as to draw their attentions to this issue while recommending the usage of TAI in case a time scale without discontinuity is needed. Also it was decided, in order to make more expedite the process, to ask the opinions of the various Commissions of the Scientific Unions.

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Commission 31: Time: (L’Heure)

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