UTCr: A rapid realization of UTC

Abstract

Considering the evolving needs of time metrology and the convenience of allowing the contributing laboratories access to a realization UTC more frequently than through the monthly Circular T, the BIPM Time Department has started to implement the computation of UTCr, a rapid realization of UTC published every week and based on daily clock and time transfer data. Results of the first weeks of a pilot experimentation of this new product are presented.I.

Precise time scales and navigation systems: mutual benefits of timekeeping and positioning

“…The BIPM also computes a rapid solution for UTC which is indicated by UTCr, this is computed every week, based on daily data (Petit et al 2014). Results are available here https ://www.bipm.org/en/bipm-servi ces/times cales /time-ftp/Rapid -UTC.html.…”

The coordinated universal time

“…If N is the number of standards considered, the number of available calibrations will be . We calculate the rate of EAL over an interval T as: (10) where Wji is the rate difference between EAL and the PSFS j for a given interval Tji, and aji are the filter coefficients. The filter coefficients aji, are normalized and depend on:…”

“…The Circular T is published monthly at five-day intervals with a delay from 10 to 45 days. Considering that UTC, as published today, is not adapted for real and quasi-real time applications, a more rapid realization called rapid UTC (UTCr) [10] is available with a reduced delay. UTCr is published weekly at one day intervals.…”

Comparison of linear regression method and GMDH neural network in predicting the UTC(PL) national timescale

“…Delay in publication of the [UTC -UTC(k)] deviations by the BIPM adversely affect the result of prediction process of UTC(k) local timescale, and consequently on maintaining the best convergence of the UTC(k) with the UTC. For this purpose the BIPM has launched in 2012 a project called "A Rapid UTC" [1,2], which main task is to expedite the transfer of information about the differences of the UTC(k) in relation to the UTC. On the basis of UTC Rapid scale, every Wednesday on the BIPMs ftp server the [UTCr -UTC(k)] deviations determined for the previous week are published, for each clock realizing the UTC(k) scale.…”