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Auteur Zuheir Altamimi
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Effect of the satellite laser ranging network distribution on geocenter motion estimation / Xavier Collilieux in Journal of geophysical research : Solid Earth, Vol 114 n° B4 (April 2009)
[article]
Titre : Effect of the satellite laser ranging network distribution on geocenter motion estimation Type de document : Article/Communication Auteurs : Xavier Collilieux , Auteur ; Zuheir Altamimi , Auteur ; Jim Ray, Auteur ; X. Wu, Auteur Année de publication : 2009 Article en page(s) : 17 p. Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] fonction de Green
[Termes IGN] géocentre
[Termes IGN] masse de la Terre
[Termes IGN] série temporelle
[Termes IGN] télémétrie laser sur satelliteRésumé : (auteur) SLR network translations estimated between a quasi-instantaneous station position set, theoretically expressed with respect to the center of mass of the Earth (CM), and a secular reference frame are the signature of the motion of the CM with respect to the Earth crust. Geocenter motion is defined here to be the motion of the CM with respect to the geometric center of the solid Earth surface (CF). SLR translational variations cannot be rigorously interpreted as identical to geocenter motion due to the sparse and nonuniform distribution of the SLR network. Their difference is called the network effect, which should be dominated at subdecadal timescales by loading signals.We have computed translation time series of the SLR network using two independent geophysically based loading models. One is a displacement model estimated from surface fluid data (Green’s function approach), called forward model, and the other is a displacement model estimated from GPS and ocean bottom pressure (OBP) data, called inverse model. The translation models have been subtracted from their respective geocenter motion models computed from degree-1 mass load coefficients in order to evaluate their network effect biases. Scatter due to the SLR network effect is at the level of 1.5 mm RMS. It could slightly shift the phase of the annual SLR geocenter motion estimate by less than 1 month and could affect X and Z annual geocenter motion amplitudes at the 1-mm level, which is about one third of the expected signal. Two distinct methods are suggested to account for network effect when comparing SLR translations to geocenter motion models. The first is to add the network effect term predicted by a displacement model to the geocenter motion loading model. The second relies on an adequate combination of SLR and GPS products to estimate SLR translation that could be better compared with geocenter motion. Numéro de notice : A2009-531 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article DOI : 10.1029/2008JB005727 Date de publication en ligne : 07/04/2009 En ligne : http://dx.doi.org/10.1029/2008JB005727 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83525
in Journal of geophysical research : Solid Earth > Vol 114 n° B4 (April 2009) . - 17 p.[article]Documents numériques
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Effect of the satellite laser ranging networkAdobe Acrobat PDF IGS contribution to the ITRF / Zuheir Altamimi in Journal of geodesy, vol 83 n° 3-4 (March - April 2009)
[article]
Titre : IGS contribution to the ITRF Type de document : Article/Communication Auteurs : Zuheir Altamimi , Auteur ; Xavier Collilieux , Auteur Année de publication : 2009 Article en page(s) : pp 375 - 383 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] centre de phase
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] positionnement par GPS
[Termes IGN] série temporelleRésumé : (auteur) We examine the contribution of the International GNSS Service (IGS) to the International Terrestrial Reference Frame (ITRF) by evaluating the quality of the incorporated solutions as well as their major role in the ITRF formation. Starting with the ITRF2005, the ITRF is constructed with input data in the form of time series of station positions (weekly for satellite techniques and daily for VLBI) and daily Earth Orientation Parameters. Analysis of time series of station positions is a fundamental first step in the ITRF elaboration, allowing to assess not only the stations behavior, but also the frame parameters and in particular the physical ones, namely the origin and the scale. As it will be seen, given the poor number and distribution of SLR and VLBI co-location sites, the IGS GPS network plays a major role by connecting these two techniques together, given their relevance for the definition of the origin and the scale of the ITRF. Time series analysis of the IGS weekly combined and other individual Analysis Center solutions indicates an internal precision (or repeatability) Numéro de notice : A2009-581 Affiliation des auteurs : IGN (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-008-0294-x En ligne : https://doi.org/10.1007/s00190-008-0294-x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=88650
in Journal of geodesy > vol 83 n° 3-4 (March - April 2009) . - pp 375 - 383[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-09031 RAB Revue Centre de documentation En réserve L003 Disponible Global Geodetic Observing System : Meeting the Requirements of a Global Society on a Changing Planet in 2020, ch. 2. The goals, achievements, and tools of modern geodesy / Hans-Peter Plag (2009)
Titre de série : Global Geodetic Observing System : Meeting the Requirements of a Global Society on a Changing Planet in 2020, ch. 2 Titre : The goals, achievements, and tools of modern geodesy Type de document : Chapitre/Contribution Auteurs : Hans-Peter Plag, Auteur ; Zuheir Altamimi , Auteur ; S. Bettadpur, Auteur ; et al., Auteur Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 2009 Importance : pp 15 - 88 Note générale : bibliographie Langues : Français (fre) Résumé : (auteur) Friedrich Robert Helmert (1843-1917) defined geodesy as the science “of measurements and mappings of the Earth’s surface”. Over time, this definition of geodesy has been extended, mainly as a consequence of technological developments allowing geodesy to observe the Earth on global scales with high accuracy. Today, geodesy is the science of determining the geometry, gravity field, and rotation of the Earth and their evolution in time. This understanding of modern geodesy has led to the definition of the “three pillars of geodesy”, namely (1) Geokinematics, (2) Earth Rotation and (3) the Gravity Field (see Figure 1.1 on page 4). These three pillars are intrinsically linked to each other, and they jointly change as a consequence of dynamical processes in the Earth system as a whole. Numéro de notice : H2008-003 Affiliation des auteurs : LAREG+Ext (1991-2011) Nature : Chapître / contribution DOI : 10.1007/978-3-642-02687-4_2 Date de publication en ligne : 01/01/2009 En ligne : https://doi.org/10.1007/978-3-642-02687-4_2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102419 Global Geodetic Observing System : Meeting the Requirements of a Global Society on a Changing Planet in 2020, ch. 8. The future geodetic reference frame / T.A. Herring (2009)
Titre de série : Global Geodetic Observing System : Meeting the Requirements of a Global Society on a Changing Planet in 2020, ch. 8 Titre : The future geodetic reference frame Type de document : Chapitre/Contribution Auteurs : T.A. Herring, Auteur ; Zuheir Altamimi , Auteur ; Hans-Peter Plag, Auteur ; P. Poli, Auteur Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 2009 Importance : pp 225 - 236 Note générale : bibliographie Langues : Français (fre) Résumé : (auteur) The ingredients for future geodetic reference frames can be separated into at least two categories, namely (1) theoretical, conventional, and definitional aspects, and (2) practical implementation aspects and physical components. In this Chapter, we focus on category (1). Numéro de notice : H2008-004 Affiliation des auteurs : LAREG+Ext (1991-2011) Nature : Chapître / contribution nature-HAL : ChOuvrScient DOI : 10.1007/978-3-642-02687-4_2 Date de publication en ligne : 01/01/2009 En ligne : https://doi.org/10.1007/978-3-642-02687-4_2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102420 Impact of the network effect on the origin and scale: case study of Satellite Laser Ranging / Xavier Collilieux (2009)
Titre : Impact of the network effect on the origin and scale: case study of Satellite Laser Ranging Type de document : Article/Communication Auteurs : Xavier Collilieux , Auteur ; Zuheir Altamimi , Auteur Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 2009 Collection : International Association of Geodesy Symposia, ISSN 0939-9585 num. 133 Conférence : IAG 2007, International Association of Geodesy General Assembly Perugia Italie Proceedings Springer Importance : pp 31 - 37 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] analyse de sensibilité
[Termes IGN] données GPS
[Termes IGN] données TLS (télémétrie)
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] mouvement du géocentre
[Termes IGN] repère de référence
[Termes IGN] station permanente
[Termes IGN] transformation de HelmertRésumé : (auteur) The study of station non linear motions requires being able to discriminate between the local motion of every station and their global motion (e.g. geocenter motion). A common used approach consists in estimating Helmert parameters with respect to a secular reference frame. But if the network is small or not well distributed, the global parameters, and mainly the translation and scale parameters, will not be rigorously decorrelated from the station displacements. The distribution of the currently operating Satellite Laser Ranging (SLR) stations is one example of such a network. The understanding of the network effect needs an analysis of the station distribution over time. It appears that SLR station distribution on the X positive hemisphere of the Earth varies seasonally. We suggest here that using GPS results to constrain the estimation of SLR station displacements may improve the estimation of the Helmert parameters. These additional constraints as well as stochastic constraints are numerically tested here in a first attempt to limit the impact of the network effect. We show that the X component of the translation and the scale are the two parameters that are the most sensitive to any change in the configuration of the added constraints. Numéro de notice : C2009-027 Affiliation des auteurs : LAREG (1991-2011) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.1007/978-3-540-85426-5_4 En ligne : https://doi.org/10.1007/978-3-540-85426-5_4 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90615 PermalinkPermalinkPermalinkPermalinkPermalinkTerrestrial reference frame implementation in global GPS analysis at TIGA ULR consortium / Guy Wöppelmann in Physics and chemistry of the Earth (A/B/C), vol 33 n° 3-4 ([01/05/2008])PermalinkPermalinkAnalyse des séries temporelles de positions des stations de géodésie spatiale : application au repère international de référence terrestre (ITRF) / Xavier Collilieux (2008)PermalinkAnomalous harmonics in the spectra of GPS position estimates / Jim Ray in GPS solutions, vol 12 n° 1 (January 20008)PermalinkPermalinkIERS annual report 2007, 3.6.1.2. Combination Centres - Institut Géographique National (IGN) / Zuheir Altamimi (2008)PermalinkIERS annual report 2007, 3.6.2.8. Combination Research Centres - Institut Géographique National (IGN) / Xavier Collilieux (2008)PermalinkPermalinkPermalinkPermalinkComparison of very long baseline interferometry, GPS, and satellite laser ranging height residuals from ITRF2005 using spectral and correlation methods / Xavier Collilieux in Journal of geophysical research : Solid Earth, vol 112 n° B12 (December 2007)PermalinkDefinition and realization of terrestrial reference systems application to ITRS and ETRS89 / Zuheir Altamimi in Forum Geografico, n° 2 (Outubro 2007)PermalinkITRF2005: A new release of the International Terrestrial Reference Frame based on time series of station positions and Earth Orientation Parameters / Zuheir Altamimi in Journal of geophysical research : Solid Earth, vol 112 n° 9 (September 2007)PermalinkGeocentric sea-level trend estimates from GPS analyses at relevant tide gauges world-wide / Guy Wöppelmann in Global and Planetary Change, vol 57 n° 3-4 (June 2007)PermalinkRapport Quadriennal 2003-2006 [du] CNFGG, ch. Geodetic Reference Frames in France : Highlights 2004-2007 / Claude Boucher (2007)Permalink
HDR in 2006
IAG Vice-President