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Earth orientation parameters estimated from VLBI during the CONT11 campaign / Tobias Nilsson in Journal of geodesy, vol 88 n° 5 (May 2014)  

Public [article]  inJournal of geodesy > vol 88 n° 5 (May 2014) . - pp 491 - 491 Titre : Earth orientation parameters estimated from VLBI during the CONT11 campaign Type de document : Article/Communication Auteurs : Tobias Nilsson, Auteur ; Robert Heinkelmann, Auteur ; Maria Karbon, Auteur ; Virginia Raposo-Pulibo, Auteur ; Harald Schuh, Auteur Année de publication : 2014 Article en page(s) : pp 491 - 491 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] données ITGB [Termes IGN] méthode de Monte-Carlo [Termes IGN] orientation de la Terre [Termes IGN] positionnement par ITGB [Termes IGN] série temporelle Résumé : (Auteur) In this paper, we investigate the accuracy of the earth orientation parameters (EOP) estimated from the continuous VLBI campaign CONT11. We first estimated EOP with daily resolution and compared these to EOP estimated from GNSS data. We find that the WRMS differences are about 31 u as for polar motion and 7 u s for length of day. This is about the precision we could expect, based on Monte Carlo simulations and the results of the previous CONT campaigns. We also estimated EOP with hourly resolution to study the sub-diurnal variations. The results confirm the results of previous studies, showing that the current IERS model for high-frequency EOP variations does not explain all the sub-diurnal variations seen in the estimated time series. We then compared our results to various empirical high-frequency EOP models. However, we did not find that any of these gave any unambiguous improvement. Several simulations testing the impact of various aspects of, e.g. the observing network were also made. For example, we made simulations assuming that all CONT11 stations were equipped with fast VLBI2010 antennas. We found that the WRMS error decreased by about a factor five compared to the current VLBI system. Furthermore, the simulations showed that it is very important to have a homogenous global distribution of the stations for achieving the highest precision for the EOP. Numéro de notice : A2014-257 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-014-0700-5 Date de publication en ligne : 21/02/2014 En ligne : https://doi.org/10.1007/s00190-014-0700-5 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33160 [article]

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