Title :
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
fDate :
May 29 2007-June 1 2007
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;
Conference_Titel :
Frequency Control Symposium, 2007 Joint with the 21st European Frequency and Time Forum. IEEE International
Conference_Location :
Geneva
Print_ISBN :
978-1-4244-0646-3
Electronic_ISBN :
1075-6787
DOI :
10.1109/FREQ.2007.4319032
