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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...
The major techniques used for the international UTC/TAI time and frequency transfers are the two independent space techniques: TWSTFT (two-way satellite time and frequency transfer) and GNSS (global navigation satellite system: GPS, GALILEO, GLONASS etc.). Comprised of multi- techniques, this system is highly redundant, of which not a single technique has dominant advantage with respect to the others...
The network of time links for the computation of TAI has always be chosen such as to allow a unique solution, i.e. not using any redundancy. In the present situation, many links can be computed with two or more techniques (mostly TW and GPS) and the TW network itself is highly redundant. In addition, the covariance matrix for the measurements from these two may now be determined with adequate uncertainty,...
All-in-view time transfer is being considered to replace common-view for computing the links of International Atomic Time (TAI). The components in all-in-view GPS time transfer that do not cancel as they do in the common-view technique are the satellite clock estimate and the ephemeris estimate. We show that these components average down as white phase noise with a typical level of 2 ns with 13 minute...
In April 2002, a pilot experiment was initiated by the BIPM in order to study the use of GPS P3 code measurements obtained with geodetic type dual frequency receivers to compute time links. For several time links, independent computations using two or three different techniques may be carried out and compared to assess the stability of each technique. This paper presents several such comparisons that...
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