Estimation of the duration of the scale unit of TAI with primary frequency standards

Author

Arias, Elisa F. ; Petit, Gérard

Author_Institution

Bur. Int. des Poids et Mesures, Sevres

fYear

2005

fDate

29-31 Aug. 2005

Firstpage

244

Lastpage

246

Abstract

Frequency measurements of primary frequency standards (PFS) are reported more or less regularly to the BIPM to improve the accuracy of TAI. Data from the several PFS are combined to compute an estimation of the duration of the scale unit of TAI. The algorithm used to this purpose "weights" the different evaluations via filter coefficients that depend on the uncertainty of the evaluation, on the time elapsed between the interval of evaluation of the PFS and that of the calculation, and on the model that represents the instability of the free atomic scale (echelle atomique libre, EAL). We discuss in this paper problems encountered with the filtering algorithm, and we propose a tentative solution. We discuss the model that could be chosen to represent the instability of EAL

Keywords

atomic clocks; filtering theory; frequency standards; BIPM; TAI; echelle atomique libre; filter coefficient; filtering algorithm; free atomic scale; frequency measurement; primary frequency standard; scale unit duration estimation; Atomic clocks; Calibration; Filtering algorithms; Frequency estimation; Frequency measurement; Laboratories; Measurement standards; Stability; Time measurement; Uncertainty;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency Control Symposium and Exposition, 2005. Proceedings of the 2005 IEEE International

Conference_Location

Vancouver, BC

Print_ISBN

0-7803-9053-9

Type

conf

DOI

10.1109/FREQ.2005.1573936

Filename

1573936