Recommendation 3 of the 82nd CIPM (1993)

Clock comparison by satellite laser techniques

The Comité International des Poids et Mesures,


  • the need for long distance time transfer at the highest possible level of accuracy,
  • that successful time transfer with a precision of 100 ps has been achieved between Western Europe and North America using LASSO (Laser Synchronization from Satellite Orbit) experiment,
  • that time transfer techniques, such as GPS (Global Positioning System), GLONASS (Global Navigation Satellite System) and two-way satellite time transfer, need an independent means of assessment of their accuracy,
  • that solutions have been proposed that may lead to dock synchronization by laser techniques using non-geostationary satellites,

recommends that the space agencies consider the installation on their satellites of appropriate equipment for dock comparison by satellite laser techniques.

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

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