[Un nouveau test de décalage gravitationnel vers le rouge à l'aide des satellites Galileo : l'expérience GREAT]
Nous présentons les résultats de l'analyse de l'expérience GREAT (Galileo gravitational Redshift test with Eccentric sATellites). Une orbite elliptique induit une modulation périodique de la différence de fréquence relative entre une horloge au sol et l'horloge du satellite, due en partie au décalage gravitationnel vers le rouge, tandis que la bonne stabilité des horloges Galileo permet de tester cette modulation périodique à un niveau élevé de précision. Les satellites GSAT0201 et GSAT0202, avec leur grande excentricité et leurs horloges H-maser embarquées, sont des candidats parfaits pour mener à bien ce test. De plus, des données de télémétrie laser sur satellites nous permettent de décorréler partiellement les perturbations de l'orbite et les erreurs d'horloge. En analysant plusieurs années de données de suivi Galileo, nous avons été en mesure d'améliorer le test de Gravity Probe A (1976) du décalage gravitationnel vers le rouge d'un facteur 5.6, fournissant, à notre connaissance, la première amélioration signalée depuis plus de 40 ans.
We present the result of the analysis of the GREAT (Galileo gravitational Redshift test with Eccentric sATellites) experiment. An elliptic orbit induces a periodic modulation of the fractional frequency difference between a ground clock and the satellite clock, partly due to the gravitational redshift, while the good stability of Galileo clocks allows one to test this periodic modulation to a high level of accuracy. GSAT0201 and GSAT0202, with their large eccentricity and on-board H-maser clocks, are perfect candidates to perform this test. Satellite laser ranging data allows us to partly decorrelate the orbit perturbations from the clock errors. By analyzing several years of Galileo tracking data, we have been able to improve the Gravity probe A test (1976) of the gravitational redshift by a factor of 5.6, providing, to our knowledge, the first reported improvement since more than 40 years.
Mot clés : GNSS, Galileo, Relativité Générale, Décalage Gravitationnel vers le rouge, Principe d'Équivalence
@article{CRPHYS_2019__20_3_176_0,
author = {Pac\^ome Delva and Neus Puchades and Erik Sch\"onemann and Florian Dilssner and Cl\'ement Courde and Stefano Bertone and Francisco Gonzalez and Aur\'elien Hees and Christophe Le Poncin-Lafitte and Fr\'ed\'eric Meynadier and Roberto Prieto-Cerdeira and Beno{\^\i}t Sohet and Javier Ventura-Traveset and Peter Wolf},
title = {A new test of gravitational redshift using {Galileo} satellites: {The} {GREAT} experiment},
journal = {Comptes Rendus. Physique},
pages = {176--182},
publisher = {Elsevier},
volume = {20},
number = {3},
year = {2019},
doi = {10.1016/j.crhy.2019.04.002},
language = {en},
}
TY - JOUR AU - Pacôme Delva AU - Neus Puchades AU - Erik Schönemann AU - Florian Dilssner AU - Clément Courde AU - Stefano Bertone AU - Francisco Gonzalez AU - Aurélien Hees AU - Christophe Le Poncin-Lafitte AU - Frédéric Meynadier AU - Roberto Prieto-Cerdeira AU - Benoît Sohet AU - Javier Ventura-Traveset AU - Peter Wolf TI - A new test of gravitational redshift using Galileo satellites: The GREAT experiment JO - Comptes Rendus. Physique PY - 2019 SP - 176 EP - 182 VL - 20 IS - 3 PB - Elsevier DO - 10.1016/j.crhy.2019.04.002 LA - en ID - CRPHYS_2019__20_3_176_0 ER -
%0 Journal Article %A Pacôme Delva %A Neus Puchades %A Erik Schönemann %A Florian Dilssner %A Clément Courde %A Stefano Bertone %A Francisco Gonzalez %A Aurélien Hees %A Christophe Le Poncin-Lafitte %A Frédéric Meynadier %A Roberto Prieto-Cerdeira %A Benoît Sohet %A Javier Ventura-Traveset %A Peter Wolf %T A new test of gravitational redshift using Galileo satellites: The GREAT experiment %J Comptes Rendus. Physique %D 2019 %P 176-182 %V 20 %N 3 %I Elsevier %R 10.1016/j.crhy.2019.04.002 %G en %F CRPHYS_2019__20_3_176_0
Pacôme Delva; Neus Puchades; Erik Schönemann; Florian Dilssner; Clément Courde; Stefano Bertone; Francisco Gonzalez; Aurélien Hees; Christophe Le Poncin-Lafitte; Frédéric Meynadier; Roberto Prieto-Cerdeira; Benoît Sohet; Javier Ventura-Traveset; Peter Wolf. A new test of gravitational redshift using Galileo satellites: The GREAT experiment. Comptes Rendus. Physique, Volume 20 (2019) no. 3, pp. 176-182. doi : 10.1016/j.crhy.2019.04.002. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2019.04.002/
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