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Auteur Véronique Dehant |
Documents disponibles écrits par cet auteur (4)
Ajouter le résultat dans votre panier Affiner la recherche Interroger des sources externesBasic Earth's Parameters as estimated from VLBI observations / Ping Zhu in Geodesy and Geodynamics, vol 8 n° 6 (November 2017)
Titre : Basic Earth's Parameters as estimated from VLBI observations Type de document : Article/Communication Auteurs : Ping Zhu, Auteur ; Attilio Rivoldini, Auteur ; Laurence Koot, Auteur ; Véronique Dehant, Auteur Année de publication : 2017 Article en page(s) : pp 427 - 432 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] analyse diachronique
[Termes IGN] données ITGB
[Termes IGN] interférométrie à très grande base
[Termes IGN] nutation
[Termes IGN] série temporelleRésumé : (auteur) The global Very Long Baseline Interferometry observation for measuring the Earth rotation's parameters was launched around 1970s. Since then the precision of the measurements is continuously improving by taking into account various instrumental and environmental effects. The MHB2000 nutation model was introduced in 2002, which is constructed based on a revised nutation series derived from 20 years VLBI observations (1980–1999). In this work, we firstly estimated the amplitudes of all nutation terms from the IERS-EOP-C04 VLBI global solutions w.r.t. IAU1980, then we further inferred the BEPs (Basic Earth's Parameters) by fitting the major nutation terms. Meanwhile, the BEPs were obtained from the same nutation time series using a BI (Bayesian Inversion). The corrections to the precession rate and the estimated BEPs are in an agreement, independent of which methods have been applied. Numéro de notice : A2017-790 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1016/j.geog.2017.04.007 En ligne : https://doi.org/10.1016/j.geog.2017.04.007 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89053
in Geodesy and Geodynamics > vol 8 n° 6 (November 2017) . - pp 427 - 432[article]
Titre : U-SBAS: A universal multi-SBAS standard to ensure compatibility, interoperability and interchangeability Type de document : Article/Communication Auteurs : Mohamed Sahmoudi, Auteur ; Jean-Luc Issler, Auteur ; Felix Perozans, Auteur ; Youssef Tawk, Auteur ; Aleksandar Jovanovic, Auteur ; Cyril Botteron, Auteur ; Pierre-André Farine, Auteur ; Landry René, Auteur ; Véronique Dehant, Auteur ; Alessandro Caporali, Auteur ; Serge Reboul, Auteur ; Pascal Willis Editeur : New York : Institute of Electrical and Electronics Engineers IEEE Année de publication : 2010 Conférence : NAVITEC 2010, 5th ESA Workshop on Satellite Navigation Technologies and European Workshop on GNSS Signals and Signal Processing 08/12/2010 10/12/2010 Noordwijk Pays-Bas Proceedings IEEE Importance : 18 p. Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] interopérabilité
[Termes IGN] standard
[Termes IGN] système d'extensionRésumé : (auteur) Several regional augmentation GNSS systems (like SBAS) are already fully operational and other are under development with new frequencies and signals on the way. Therefore, it becomes imperative to guarantee for all GNSS users the compatibility, interoperability and interchangeability between all these systems. The goal is to ensure that the user's multi-mode receiver can choose and mix signals from different GNSS and SBAS systems to achieve more availability, accuracy and robustness. Attaining that objective will require agreements on frequency plans and signal designs, as well as other details including means to ensure interoperability of system times and geodetic reference systems. This paper suggests a Universal-SBAS (U-SBAS) standard, compatible with all the existing and planned regional GNSS systems (and their evolutions) in the world, like IRNSS, QZSS, PCW, BEIDOU-1, WAAS, EGNOS, SDCM, GAGAN, MSAS. The proposed worldwide multimodal U-SBAS standard carries additional channels (signals and messages) to cover the non-aeronautical specific Safety-of-Life (SoL) services, and also High Precision Positioning Services (HPPS), Position Velocity Time (PVT), authentication services, safety services, scientific application services, High Precision Timing Services (HPTS), etc. U-SBAS is designed to be fully interoperable with the current SBAS standards and to allow significant performance and service improvements in operational, scientific and/or security areas. Finally usage examples of the proposed standard are given for different types of applications such as science, aviation, precise point positioning, timing, security, robust positioning, maritime and reflectometry. Numéro de notice : C2010-074 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.1109/NAVITEC.2010.5708076 En ligne : https://doi.org/10.1109/NAVITEC.2010.5708076 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102057
Titre : VLBI and Earth Rotation: Geophysical and Geodetic Challenges Type de document : Article/Communication Auteurs : Martine Feissel-Vernier Editeur : Washington : National Aeronautics and Space Administration NASA Année de publication : 2004 Conférence : IVS 2004, 3th General Meeting of International VLBI Service for Geodesy and Astrometry 09/02/2004 11/02/2004 Ottawa Canada Open Access Proceedings Importance : pp 22 - 31 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] interférométrie à très grande baseRésumé : (auteur) We examine some current limitations in the interpretation of VLBI Earth rotation measurements due to factors inherent in existing observing programs and we propose directions for possible future improvements to enhance the contributions to geophysics. Numéro de notice : C2004-051 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://ivscc.gsfc.nasa.gov/publications/gm2004/feissel.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103051
Titre : Remaining error sources in the nutation at the submilliarc second level Type de document : Article/Communication Auteurs : Véronique Dehant, Auteur ; Martine Feissel-Vernier Année de publication : 2003 Article en page(s) : pp 13-1 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] interférométrie à très grande base
[Termes IGN] nutationRésumé : (auteur) Earth's precession and nutations are mainly generated by the luni-solar tidal torque. Diurnal retrograde variations in the atmospheric and oceanic angular momenta in an Earth-fixed reference system induce some additional nutation motions. Observed precession and nutations are derived from very long baseline interferometry (VLBI) data, assuming that the direction of the observed quasars are fixed in space. In this study, we consider the effects of two possible causes for explaining discrepancies between the observed nutations and those modeled in MHB2000 (model adopted by the International Astronomical Union): (1) the time variations in the atmospheric (and potentially oceanic) forcing of the nutations, of the free core nutation (FCN), and of the free inner core nutation (FICN), and (2) the possible contamination of VLBI-derived nutation amplitudes by apparent changes in the directions of the extragalactic radio sources. The robustness of MHB2000 is tested by perturbing some of the parameters and assessing the validity of the resulting nutation amplitudes against realistic estimations. We show that even allowing for large discrepancies related to atmospheric forcing, the ranges of the possible changes in the FCN and FICN periods and damping factors are small. Numéro de notice : A2003-472 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article DOI : 10.1029/2002JB001763 Date de publication en ligne : 24/05/2003 En ligne : https://doi.org/10.1029/2002JB001763 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102730
in Journal of geophysical research : Solid Earth > vol 108 n° 5 (May 2003) . - pp 13-1[article]
