First comparison of remote cesium fountains

Author

Parker, T. ; Hetzel, P. ; Jefferts, S. ; Weyers, S. ; Nelson, L. ; Bauch, A. ; Levine, J.

Author_Institution

Nat. Inst. of Stand. & Technol., Boulder, CO, USA

fYear

2001

fDate

6/23/1905 12:00:00 AM

Firstpage

63

Lastpage

68

Abstract

The frequencies of the cesium fountain primary frequency standards at the National Institute of Standards and Technology and the Physikalisch-Technische Bundesanstalt have been compared. Two-way satellite time and frequency transfer and GPS carrier-phase were the principal frequency-transfer techniques used to make the comparison. For the 15-day interval in which both fountains were in operation the frequencies were compared with an additional uncertainty due to the comparison process of only 6.2 × 10^-16. The two standards agree within their stated one-sigma uncertainties of ~ 1.7 × 10^-15

Keywords

Global Positioning System; atomic clocks; caesium; frequency standards; measurement uncertainty; synchronisation; transfer standards; Allan deviation; Cs; GPS carrier-phase; NIST standards; PTB standards; TWSTFT; additional uncertainty; cesium fountain; primary frequency standards; Atomic clocks; Atomic measurements; Extraterrestrial measurements; Frequency; Global Positioning System; Masers; NIST; Satellites; Stability; Uncertainty;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency Control Symposium and PDA Exhibition, 2001. Proceedings of the 2001 IEEE International

Conference_Location

Seattle, WA

ISSN

1075-6787

Print_ISBN

0-7803-7028-7

Type

conf

DOI

10.1109/FREQ.2001.956161

Filename

956161