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2 results

  • Impact of new frequency standards on the international time scales

  • E. Felicitas Arias, Gianna Panfilo
  • Journal:
    Proceedings of the International Astronomical Union / Volume 5 / Issue H15 / November 2009
    Published online by Cambridge University Press:
    21 October 2010, pp. 223-224
    Print publication:
    November 2009
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  • The reference time scales maintained at the International Bureau of Weights and Measures (BIPM) are constructed with data from industrial clocks and primary frequency standards operated in national metrology laboratories and observatories world-wide distributed. Clocks are compared making use of techniques of time transfer between remote sites. The algorithm of calculation relies on clock weighting and clock frequency prediction. We briefly present hereafter the influence of some clocks on the scales, as well as the possibilities for improvement.

  • Current and future realizations of coordinate time scales

  • E. Felicitas Arias
  • Journal:
    Proceedings of the International Astronomical Union / Volume 5 / Issue S261 / April 2009
    Published online by Cambridge University Press:
    06 January 2010, pp. 95-101
    Print publication:
    April 2009
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  • Two atomic time scales maintained at the International Bureau of Weights and Measures (BIPM) are realizations of terrestrial time: International Atomic Time (TAI) and TT(BIPM). They are calculated from atomic clocks realizing proper time in national laboratories. The algorithm for the calculation of TAI has been designed to optimize the frequency stability and accuracy of the time scale. Plans for the future improvement of the reference time scales are presented.