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In almost all the studies, the differential receiver calibration and the link calibration had been discussed separately as if the two calibrations were completely independent. In fact, in the sense of the total delay for UTC time transfer, the difference between the receiver and link calibrations is not how to perform the calibration measurement but how to use the measurement data. The two calibration...
Accurate time transfers are now fully based on space techniques. The recently developed optical fibre technique is expected to be used in the UTC generation in the future. Some UTC labs operate optical fibre links using different approaches. In particular, the here called Two-Way Optical Fibre Time (and Frequency) Transfer (TWOFT/TWOTFT) is of special interest. The symmetry of the propagation conditions...
The dominant part of the total uncertainty budget in the [UTC-UTC(k)] is from the type B uncertainty (uB) in time link calibration. In fact, 60% of the type A uncertainty (ua) in UTC time links are < 1 ns while the 93% of uB ≥ 5ns. In 2011, the BIPM launched a pilot experiment to reduce the uB from 5 ns at present to ≤ 2 ns and has developed a standard calibration scheme, namely METODE, associated...
We present the new side-product of the monthly UTC computation: the long-term time links which is monthly published since Jan. 2010 and available on the BIPM ftp site: ftp://tai.bipm.org/TimeLink/LkC/LongTerm/. The techniques used for UTC generation are now TW, GPS and GLN. If they are considered independent, we can apply them in the investigations of the measurement uncertainties and the relative...
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