The New TA(TL) Model Composited by Hydrogen Maser and Cesium Clock Ensembles

Shinn Yan Lin

Abstract:	We design and evaluate 2 new independent atomic timescales of TL to adapt the composition change of the atomic clock ensemble from major cesium clocks into hydrogen masers. In response of the affiliation of hydrogen maser ensemble (ens(hm)) and to keep the phase accuracy of the 2 new timescales, the drift rate of each hydrogen maser is predicted and removed according to the cesium clock ensemble (ens(cs)) and the short term frequency jump of cesium clocks are corrected by ens(hm). The long term overlap Hadamard deviation and short term overlap Allan deviation are used for filtering out the occasional outlier clock data of hydrogen masers and cesium clocks separately. In the 250 days simulation test from March to November 2018, both 2 new timescale displayed more stable and accurate performance than the old TA(TL) timescale. Their modified Allan deviation could reach below 1E-15 and the time deviation is less than 1 ns after the average time 60 days with respect to TAI.
Published in:	Proceedings of the 50th Annual Precise Time and Time Interval Systems and Applications Meeting January 28 - 31, 2019 Hyatt Regency Reston Reston, Virginia
Pages:	284 - 289
Cite this article:	Lin, Shinn Yan, "The New TA(TL) Model Composited by Hydrogen Maser and Cesium Clock Ensembles," Proceedings of the 50th Annual Precise Time and Time Interval Systems and Applications Meeting, Reston, Virginia, January 2019, pp. 284-289. https://doi.org/10.33012/2019.16757
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