ION Technical Content
The Accuracy of TAI
| Abstract: | By definition, the duration of the TAI scale unit should be as close as possible to the SI second on the rotating geoid. The frequency of the pee atomic time scale, computed at the BIPM as a weighted average of commercial clock data obtained from time laboratories, was carefully steered for more than ten years in order to generate an international time reference which conforms with this definition. In 1995, uniform application of the correction compensating for the black-body frequency ship in primary frequency standards artificially degraded the accuracy of TAI. A procedure to compensate for this effect was immediately implemented, but only compensated for the natural drip of the free atomic time scale over the first two yews, Ieading to the uncomfortable condition that TAI was not sufficiently accurate. Since April 1997, an improvement in the accuracy of TAI has been detected, but has still to be confirmed. For this purpose results from very accurate primary frequency standards, such as the new cesium fountains now under development, would be very helpful. |
| Published in: |
Proceedings of the 29th Annual Precise Time and Time Interval Systems and Applications Meeting December 2 - 4, 1997 Sheraton Long Beach Hotel Long Beach, California |
| Pages: | 19 - 26 |
| Cite this article: | Thomas, Claudine, "The Accuracy of TAI," Proceedings of the 29th Annual Precise Time and Time Interval Systems and Applications Meeting, Long Beach, California, December 1997, pp. 19-26. |
| Full Paper: |
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