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Accuracy of the International Terrestrial Reference Frame origin and Earth expansion / X. Wu in Geophysical research letters, vol 38 n° 13 (July 2011)  

Public [article]  inGeophysical research letters > vol 38 n° 13 (July 2011) . - 5 p. Titre : Accuracy of the International Terrestrial Reference Frame origin and Earth expansion Type de document : Article/Communication Auteurs : X. Wu, Auteur ; Xavier Collilieux , Auteur ; Zuheir Altamimi , Auteur ; B.L.A. Vermeersen, Auteur ; Richard S. Gross, Auteur ; I. Fukumori, Auteur Année de publication : 2011 Article en page(s) : 5 p. Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] International Terrestrial Reference Frame Résumé : (auteur) The International Terrestrial Reference Frame (ITRF) is a fundamental datum for high‐precision orbit tracking, navigation, and global change monitoring. Accurately realizing and maintaining ITRF origin at the mean Earth system center of mass (CM) is critical to surface and spacecraft based geodetic measurements including those of sea level rise and its sources. Although ITRF combines data from satellite laser ranging (SLR), Very Long Baseline Interferometry (VLBI), Global Positioning System (GPS), and Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS), its origin is currently realized by the single technique of SLR. Consequently, it is difficult to independently evaluate the origin accuracy. Also, whether the solid Earth is expanding or shrinking has attracted persistent attention. The expansion rate, if any, has not been accurately determined before, due to insufficient data coverage on the Earth's surface and the presence of other geophysical processes. Here, we use multiple precise geodetic data sets and a simultaneous global estimation platform to determine that the ITRF2008 origin is consistent with the mean CM at the level of 0.5 mm yr−1, and the mean radius of the Earth is not changing to within 1σ measurement uncertainty of 0.2 mm yr−1. Numéro de notice : A2011-590 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1029/2011GL047450 Date de publication en ligne : 08/07/2011 En ligne : https://doi.org/10.1029/2011GL047450 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90909 [article]