Impact of new clock technologies on the stability and accuracy of the International Atomic Time TAI.

Details Impact of new clock technologies on the stability and accuracy of the International Atomic Time TAI. Impact of new clock technologies on the stability and accuracy of the International Atomic Time TAI.

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997ituff..44..693t&link_type=abstract

IEEE Trans. Ultrason. Ferroelectr. Freq. Control, Vol. 44, No. 3, p. 693 - 700

Physics

2

Clocks: Atomic Time

Scientific paper

The BIPM Time Section is in charge of the generation of the reference time scales TAI and UTC. Both time scales are obtained in deferred-time by combining the data front a number of atomic clocks spread worldwide. The accuracy of TAI is estimated by the departure between the duration of the TAI scale interval and the SI second as produced on the rotating geoid by primary frequency standards. It is now possible to estimate TAI accuracy through the combination of results obtained from six different primary standards: LPTF-FO1, PTB CS1, PTB CS2, PTB CS3, NIST-7, and SU MCsR 102, all corrected for the black-body radiation shift. This led to a mean departure of the TAI scale interval of +2.0×10-14s over 1995, known with a relative uncertainty of 0.5×10-14(1σ).

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