ves tigate this by binning the observed deviation from linear dri over the near-continuous data set according to the time of day. e results are con sis tent with a statis-tical distribution, and we nd a residual de vi a tion of −1.98(7.70)×10 for the interval from 14:00 to 20:00 typical for intermittent measurements. For such measure-ments, we include this as a systematic type B uncertainty of _⁄=√−1.98+7.70×10=7.95×10 .For measurements of a signicantly longer continuous mea sure ment time , we assume phase excursions of simi-lar magnitude and assign a reduced uncertainty of _⁄/(/) , where =21 600 s is the length of the investigated 6 h reference period (Fig.6).In the data reported in circular T, and directly represent the performance of the optical lattice clock All other uncertainties are included in ⁄=+++_⁄ .(13)ConclusionIn November 2018, NICT-Sr1 was approved as a sec-7FiF5(a) Available data for over the 10 d period of Fig.2 and (b) corresponding weighting function () (c) Squared sensitivity function |()| (green shaded graph) with overlaid curves representing the frequency dependence of the PSD for relevant noise types. (d) The analysis applies the maser stability model (thick brown line) extracted from long-term DMTD data. Stable maser operation over the evaluation period is confirmed through the Hadamard deviation of the frequency difference of the individual masers from the selected ensemble (colored markers). HM JST#13 (open circles) has been excluded from the ensemble due to excess observed instability. (e) Frequency corrections applied to reference maser HM JST#15 to compensate for deviation from linear drift, determined from the ensemble average.974-4 光 – マイクロ波リンクとTAI校正
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