Authors
Franziska Riedel, Ali Al-Masoudi, Erik Benkler, Sören Dörscher, Vladislav Gerginov, Christian Grebing, Sebastian Häfner, Nils Huntemann, Burghard Lipphardt, Christian Lisdat, Ekkehard Peik, Dirk Piester, Christian Sanner, Christian Tamm, Stefan Weyers, H Denker, Ludger Timmen, Christian Voigt, Davide Calonico, Giancarlo Cerretto, Giovanni A Costanzo, Filippo Levi, Ilaria Sesia, Joseph Achkar, Jocelyne Guéna, Michel Abgrall, Giovanni Daniele Rovera, Baptiste Chupin, Chunyan Shi, Sŀawomir Bilicki, Eva Bookjans, Jérôme Lodewyck, Rodolphe Le Targat, Pacome Delva, Sebastien Bize, Fred N Baynes, Charles Baynham, William Bowden, Patrick Gill, RM Godun, Ian Robert Hill, Richard Hobson, JM Jones, Steven A King, Peter Nisbet-Jones, A Rolland, SL Shemar, Peter B Whibberley, Helen S Margolis
Publication date
2020/1/3
Journal
Metrologia
Volume
57
Issue
4
Pages
045005
Publisher
IOP Publishing
Description
We carried out a 26-day comparison of five simultaneously operated optical clocks and six atomic fountain clocks located at INRIM, LNE-SYRTE, NPL and PTB by using two satellite-based frequency comparison techniques: broadband Two-Way Satellite Time and Frequency Transfer (TWSTFT) and Global Positioning System Precise Point Positioning (GPS PPP). With an enhanced statistical analysis procedure taking into account correlations and gaps in the measurement data, combined overall uncertainties in the range of 1.8× 10− 16 to 3.5× 10− 16 for the optical clock comparisons were found. The comparison of the fountain clocks yields results with a maximum relative frequency difference of 6.9× 10− 16, and combined overall uncertainties in the range of 4.8× 10− 16 to 7.7× 10− 16.
Scholar articles
F Riedel, A Al-Masoudi, E Benkler, S Dörscher… - Metrologia, 2020