– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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Resolution 4 of the 18th CGPM (1987)
Version française
Time comparisons using satellite links

    The 18th Conférence Générale des Poids et Mesures


  • that high-precision timing is rapidly becoming an essential part of modern telecommunications,
  • that two-way satellite links allow international time comparisons at very high precision,
  • that it appears possible to exchange pseudo-random-noise timing signals simultaneously but without interference with other uses of the channel,
  • that such pseudo-random-noise techniques also allow high-precision ranging,
  • recommends that the responsible national and international bodies support experiments over telecommunications satellite links for the study of synchronization techniques by means of pseudo-random-noise modulation within the framework of the international timing programs as part of the generation of International Atomic Time.

Comptes Rendus de la 18e CGPM (1987), 1988, p.99
Metrologia, 1988, 25(2), 113-119

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

Other Resolutions of the 18th CGPM (1987)
Resolution 1
Resolution 2
Resolution 3
Resolution 4
Resolution 5
Resolution 6
Resolution 7
Resolution 8
Resolution 9