High accuracy gravitational red-shift evaluation at INRIM

Author

Calonico, D. ; Levi, F. ; Lorini, L. ; Godone, A. ; Cina, A. ; Bendea, I.H.

Author_Institution

Ist. Nazionale di Ricerca Metrol., Turin

fYear

2007

fDate

May 29 2007-June 1 2007

Firstpage

62

Lastpage

66

Abstract

The gravitational redshift is presently one of the main biases in the comparison of primary frequency standard, and it could be a challenge for the forthcoming generation of atomic optical clocks. In this paper we report the evaluation of the gravitational redshift with respect to the Geoid reference at INRIM laboratories, with an accuracy of 1 times 10^-17 in terms of relative frequency. The evaluation is based on GPS/levelling measurements and on the use of a local model for the Earth Geoid and its accuracy is limited by the reference potential of the Geoid.

Keywords

Global Positioning System; atomic clocks; frequency standards; gravitational red shift; Earth Geoid; GPS; INRIM; atomic optical clocks; frequency standard; gravitational red-shift evaluation; levelling measurement; Atom optics; Atomic clocks; Atomic measurements; Earth; Frequency conversion; Gravity; Laboratories; Optical frequency conversion; Sea surface; Uncertainty;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency Control Symposium, 2007 Joint with the 21st European Frequency and Time Forum. IEEE International

Conference_Location

Geneva

ISSN

1075-6787

Print_ISBN

978-1-4244-0646-3

Electronic_ISBN

1075-6787

Type

conf

DOI

10.1109/FREQ.2007.4319032

Filename

4319032