Comptes Rendus
URSI-France 2018 Workshop: Geolocation and navigation / Journées URSI-France 2018 : géolocalisation et navigation
A new test of gravitational redshift using Galileo satellites: The GREAT experiment
[Un nouveau test de décalage gravitationnel vers le rouge à l'aide des satellites Galileo : l'expérience GREAT]
Comptes Rendus. Physique, Volume 20 (2019) no. 3, pp. 176-182.

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.

Publié le :
DOI : 10.1016/j.crhy.2019.04.002
Keywords: GNSS, Galileo, General Relativity, Gravitational Redshift, Equivalence Principle
Mot clés : GNSS, Galileo, Relativité Générale, Décalage Gravitationnel vers le rouge, Principe d'Équivalence

Pacôme Delva 1 ; Neus Puchades 1, 2 ; Erik Schönemann 3 ; Florian Dilssner 3 ; Clément Courde 4 ; Stefano Bertone 5 ; Francisco Gonzalez 6 ; Aurélien Hees 1 ; Christophe Le Poncin-Lafitte 1 ; Frédéric Meynadier 1 ; Roberto Prieto-Cerdeira 6 ; Benoît Sohet 1 ; Javier Ventura-Traveset 7 ; Peter Wolf 1

1 SYRTE, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, LNE, 61, avenue de l'Observatoire, 75014 Paris, France
2 Departamento de Astronomía y Astrofísica, Edificio de Investigación Jerónimo Muñoz, C/Dr. Moliner, 50, 46100 Burjassot (Valencia), Spain
3 European Space Operations Center, ESA/ESOC, Darmstadt, Germany
4 UMR Geoazur, Université de Nice, Observatoire de la Côte d'Azur, 250, rue Albert-Einstein, 06560 Valbonne, France
5 Astronomical Institute, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland
6 European Space and Technology Centre, ESA/ESTEC, Noordwijk, The Netherlands
7 European Space and Astronomy Center, ESA/ESAC, Villanueva de la Cañada, Spain
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     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},
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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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