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Auteur Zuheir Altamimi
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Strategies to mitigate aliasing of loading signals while estimating GPS frame parameters / Xavier Collilieux in Journal of geodesy, vol 86 n° 1 (January 2012)
[article]
Titre : Strategies to mitigate aliasing of loading signals while estimating GPS frame parameters Type de document : Article/Communication Auteurs : Xavier Collilieux , Auteur ; Tonie M. van Dam, Auteur ; Jim Ray, Auteur ; David Coulot , Auteur ; Laurent Métivier , Auteur ; Zuheir Altamimi , Auteur Année de publication : 2012 Projets : TOSCA / Article en page(s) : pp 1 - 14 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] crénelage
[Termes IGN] effet de charge
[Termes IGN] estimation statistique
[Termes IGN] géocentre
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] positionnement par GPSRésumé : (Auteur) Although GNSS techniques are theoretically sensitive to the Earth center of mass, it is often preferable to remove intrinsic origin and scale information from the estimated station positions since they are known to be affected by systematic errors. This is usually done by estimating the parameters of a linearized similarity transformation which relates the quasi-instantaneous frames to a long-term frame such as the International Terrestrial Reference Frame (ITRF). It is well known that non-linear station motions can partially alias into these parameters. We discuss in this paper some procedures that may allow reducing these aliasing effects in the case of the GPS techniques. The options include the use of well-distributed sub-networks for the frame transformation estimation, the use of site loading corrections, a modification of the stochastic model by downweighting heights, or the joint estimation of the low degrees of the deformation field. We confirm that the standard approach consisting of estimating the transformation over the whole network is particularly harmful for the loading signals if the network is not well distributed. Downweighting the height component, using a uniform sub-network, or estimating the deformation field perform similarly in drastically reducing the amplitude of the aliasing effect. The application of these methods to reprocessed GPS terrestrial frames permits an assessment of the level of agreement between GPS and our loading model, which is found to be about 1.5 mm WRMS in height and 0.8 mm WRMS in the horizontal at the annual frequency. Aliased loading signals are not the main source of discrepancies between loading displacement models and GPS position time series. Numéro de notice : A2012-117 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-011-0487-6 Date de publication en ligne : 08/11/2011 En ligne : https://doi.org/10.1007/s00190-011-0487-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31565
in Journal of geodesy > vol 86 n° 1 (January 2012) . - pp 1 - 14[article]Réservation
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Titre : The choice of reference system in ITRF formulation Type de document : Article/Communication Auteurs : Zuheir Altamimi , Auteur ; Athanasios Dermanis, Auteur Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 2012 Collection : International Association of Geodesy Symposia, ISSN 0939-9585 num. 137 Conférence : IAG 2009, 7th Hotine-Marussi Symposium on Mathematical Geodesy 06/06/2009 10/06/2009 Rome Italie Proceedings Springer Importance : pp 329 - 334 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] barycentre
[Termes IGN] coordonnées cartésiennes géocentriques
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] moment cinétique
[Termes IGN] système de référence géodésique
[Termes IGN] vitesseRésumé : (auteur) The problem of choosing an optimal reference system for the International Terrestrial Reference Frame (ITRF) is studied for both the rigorous solution which is a simultaneous stacking (removal of the reference system at each data epoch and implementation of a linear in time coordinate model) for all techniques, as well as for the usual numerically convenient separation into a set of individual stackings one for each technique and a final combination step for the derived initial coordinates and velocities. Two approaches are followed, an algebraic and a kinematic one. The algebraic approach implements the inner constraints, which minimize the sum of squares of the unknown parameters, as well as partial inner constraints, which minimize the sum of squares of a subset of the unknown parameters. In the kinematical approach the optimal minimal constraints are derived by requiring the minimization of the apparent coordinate variations: (a) with respect to the origin by imposing constant coordinates for the network barycenter, (b) with respect to orientation by imposing zero relative angular momentum for the network points conceived as mass points with equal mass and (c) with respect to the scale by imposing constant mean quadratic size (involving the distances of stations from their barycenter). Numéro de notice : C2009-036 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.1007/978-3-642-22078-4_49 Date de publication en ligne : 18/10/2011 En ligne : https://doi.org/10.1007/978-3-642-22078-4_49 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91643 Correction to “Topographically induced height errors in predicted atmospheric loading effects” / Tonie M. van Dam in Journal of geophysical research : Solid Earth, Vol 116 n° B11 (November 2011)
[article]
Titre : Correction to “Topographically induced height errors in predicted atmospheric loading effects” Type de document : Article/Communication Auteurs : Tonie M. van Dam, Auteur ; Zuheir Altamimi , Auteur ; Xavier Collilieux , Auteur ; Jim Ray, Auteur Année de publication : 2011 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique Résumé : (auteur) In the paper “Topographically induced height errors in predicted atmospheric loading effects” by T. van Dam et al. (Journal of Geophysical Research, 115, B07415, doi:10.1029/2009JB006810), an incorrect version of Figure 1 was published. The correct image, with its caption, is presented here. The corrected image does not alter the conclusion presented in the original paper. Numéro de notice : A2011-613 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article DOI : 10.1029/2011JB008815 Date de publication en ligne : 08/11/2011 En ligne : https://doi.org/10.1029/2011JB008815 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91746
in Journal of geophysical research : Solid Earth > Vol 116 n° B11 (November 2011)[article]ITRF2008: an improved solution of the international terrestrial reference frame / Zuheir Altamimi in Journal of geodesy, vol 85 n° 8 (August 2011)
[article]
Titre : ITRF2008: an improved solution of the international terrestrial reference frame Type de document : Article/Communication Auteurs : Zuheir Altamimi , Auteur ; Xavier Collilieux , Auteur ; Laurent Métivier , Auteur Année de publication : 2011 Projets : 1-Pas de projet / Article en page(s) : pp 457 - 473 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] exactitude des données
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] rotation de la Terre
[Termes IGN] série temporelle
[Termes IGN] système de référence mondial
[Termes IGN] télémétrie laser sur satelliteRésumé : (Auteur) ITRF2008 is a refined version of the International Terrestrial Reference Frame based on reprocessed solutions of the four space geodetic techniques: VLBI, SLR, GPS and DORIS, spanning 29, 26, 12.5 and 16 years of observations, respectively. The input data used in its elaboration are time series (weekly from satellite techniques and 24-h session-wise from VLBI) of station positions and daily Earth Orientation Parameters (EOPs). The ITRF2008 origin is defined in such a way that it has zero translations and translation rates with respect to the mean Earth center of mass, averaged by the SLR time series. Its scale is defined by nullifying the scale factor and its rate with respect to the mean of VLBI and SLR long-term solutions as obtained by stacking their respective time series. The scale agreement between these two technique solutions is estimated to be 1.05 + 0.13 ppb at epoch 2005.0 and 0.049 + 0.010 ppb/yr. The ITRF2008 orientation (at epoch 2005.0) and its rate are aligned to the ITRF2005 using 179 stations of high geodetic quality. An estimate of the origin components from ITRF2008 to ITRF2005 (both origins are defined by SLR) indicates differences at epoch 2005.0, namely: -0.5, -0.9 and -4.7 mm along X, Y and Z-axis, respectively. The translation rate differences between the two frames are zero for Y and Z, while we observe an X-translation rate of 0.3 mm/yr. The estimated formal errors of these parameters are 0.2 mm and 0.2 mm/yr, respectively. The high level of origin agreement between ITRF2008 and ITRF2005 is an indication of an imprecise ITRF2000 origin that exhibits a Z-translation drift of 1.8 mm/yr with respect to ITRF2005. An evaluation of the ITRF2008 origin accuracy based on the level of its agreement with ITRF2005 is believed to be at the level of 1 cm over the time-span of the SLR observations. Considering the level of scale consistency between VLBI and SLR, the ITRF2008 scale accuracy is evaluated to be at the level of 1.2 ppb (8 mm at the equator) over the common time-span of the observations of both techniques. Although the performance of the ITRF2008 is demonstrated to be higher than ITRF2005, future ITRF improvement resides in improving the consistency between local ties in co-location sites and space geodesy estimates. Numéro de notice : A2011-356 Affiliation des auteurs : LAREG (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-011-0444-4 Date de publication en ligne : 03/02/2011 En ligne : https://doi.org/10.1007/s00190-011-0444-4 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31135
in Journal of geodesy > vol 85 n° 8 (August 2011) . - pp 457 - 473[article]Réservation
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ITRF2008: an improved solution ... - pdf éditeurAdobe Acrobat PDF Accuracy of the International Terrestrial Reference Frame origin and Earth expansion / X. Wu in Geophysical research letters, vol 38 n° 13 (July 2011)
[article]
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 FrameRésumé : (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
in Geophysical research letters > vol 38 n° 13 (July 2011) . - 5 p.[article]Quality assessment of GPS reprocessed terrestrial reference frame / Xavier Collilieux in GPS solutions, vol 15 n° 3 (July 2011)PermalinkErratum to “On secular geocenter motion: The impact of climate changes” / Laurent Métivier in Earth and planetary science letters, vol 306 n° 1-2 (June 2011)PermalinkITRF 2008 : nouvelle réalisation du système international de référence terrestre / Zuheir Altamimi in Bulletin d'information scientifique et technique de l'IGN, n° 77 (avril 2011)PermalinkLes mouvements séculaires du géocentre, le réchauffement climatique et l'ITRF / Laurent Métivier in Bulletin d'information scientifique et technique de l'IGN, n° 77 (avril 2011)PermalinkGGSP : Realisation and maintenance of the Galileo terrestrial reference frame / Gerd Gendt in Advances in space research, vol 47 n° 2 ([15/01/2011])PermalinkPermalinkPermalinkIDS contribution to ITRF2008 / Jean-Jacques Valette in Advances in space research, vol 46 n° 12 (15/12/2010)PermalinkImproved constraints on models of glacial isostatic adjustment: A review of the contribution of ground-based geodetic observations / Matt A. King in Surveys in Geophysics, vol 31 n° 5 (September 2010)PermalinkOn secular geocenter motion: The impact of climate changes / Laurent Métivier in Earth and planetary science letters, vol 296 n° 3-4 (August 2010)PermalinkTopographically induced height errors in predicted atmospheric loading effects / Tonie M. van Dam in Journal of geophysical research : Solid Earth, Vol 115 n° B7 (July 2010)PermalinkQuality assessment of the IDS contribution to ITRF2008 / Zuheir Altamimi in Advances in space research, vol 45 n° 12 (15/06/2010)PermalinkImpact of regional reference frame definition on geodynamic interpretations / Juliette Legrand in Journal of geodynamics, vol 49 n° 3-4 (April 2010)PermalinkImpact of loading effects on determination of the International Terrestrial Reference Frame / Xavier Collilieux in Advances in space research, vol 45 n° 1 ([04/01/2010])PermalinkPermalinkUnderstanding sea-level rise and variability, ch 9. Geodetic observations and global reference frame contributions to understanding sea-level rise and variability / Geoffrey Blewitt (2010)PermalinkLocal effects of redundant terrestrial and GPS-based tie vectors in ITRF-like combinations / Claudio Abbondanza in Journal of geodesy, vol 83 n° 11 (November 2009)PermalinkLocal effects of redundant terrestrial and GPS-based tie vectors in ITRF-like combinations / Claudio Abbondanza in Journal of geodesy, vol 83 n° 11 (November 2009)PermalinkETRS89 realization: current status, ETRF2005 and future development / Zuheir Altamimi in Bulletin of geodesy and geomatics BGG, vol 68 n° 3 (October 2009)PermalinkRates of sea‐level change over the past century in a geocentric reference frame / Guy Wöppelmann in Geophysical research letters, vol 36 n° 12 (June 2009)PermalinkEffect 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)PermalinkIGS contribution to the ITRF / Zuheir Altamimi in Journal of geodesy, vol 83 n° 3-4 (March - April 2009)PermalinkGlobal 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)PermalinkGlobal 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)PermalinkImpact of the network effect on the origin and scale: case study of Satellite Laser Ranging / Xavier Collilieux (2009)PermalinkPermalinkPermalinkPermalinkPermalinkPermalinkTerrestrial 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)PermalinkDORIS contribution to ITRF2005 / Zuheir Altamimi in Journal of geodesy, vol 80 n° 8-11 (November 2006)PermalinkGlobal geodetic observing system: considerations for the geodetic network infrastructure / Michael Pearlman in Geomatica, vol 60 n° 2 (June 2006)PermalinkPermalinkPermalinkPermalinkPermalinkPermalinkSystèmes de référence terrestres / Zuheir Altamimi (2006)PermalinkIs there utility in rigorous combinations of VLBI and GPS Earth orientation parameters? / Jim Ray in Journal of geodesy, vol 79 n° 9 (December 2005)PermalinkTerrestrial reference frame requirements within GGOS perspective / Zuheir Altamimi in Journal of geodynamics, vol 40 n° 4-5 (November - December 2005)PermalinkEvaluation of co-location ties relating the VLBI and GPS reference frames / Jim Ray in Journal of geodesy, vol 79 n° 4-5 (July 2005)PermalinkApplications géodésiques du système DORIS à l'Institut Géographique National / Pascal Willis in Comptes rendus : Géoscience, vol 337 n° 7 (May 2005)PermalinkLong-term stability of the terrestrial reference frame / Zuheir Altamimi in Advances in space research, vol 36 n° 3 (March 2005)PermalinkDense European velocity Field and ETRS89 positions and velocities of the EPN stations / Zuheir Altamimi (2005)PermalinkCombination of space geodesy techniques for monitoring the kinematics of the Earth / David Coulot (2004)PermalinkIGS reference frames: status and future improvements / Jim Ray (2004)PermalinkPermalinkStatus of AFREF Project / Jim Ray (2004)PermalinkTests of IGS Reference Frame Stability / Zuheir Altamimi (2004)PermalinkTowards a dense European velocity field / Zuheir Altamimi (2004)PermalinkPermalinkDiscussion on how to express a regional GPS solution in the ITRF / Zuheir Altamimi (01/12/2003)PermalinkCurrent GPS data analysis at CLDG for the IGS TIGA Pilot Project / Guy Wöppelmann in Cahiers bleus du Centre Europeen de Geodynamique et de Séismologie, vol 23 (2003)PermalinkCombinaison de séries temporelles des positions des stations et des paramètres de rotation de la Terre / Zuheir Altamimi in Bulletin d'information scientifique et technique de l'IGN, n° 74 (mars 2003)PermalinkPermalinkPermalinkPermalinkMulti-technique combination of time series of station positions and Earth orientation parameters / Zuheir Altamimi (2003)PermalinkThe impact of a No-Net-Rotation Condition on ITRF2000 / Zuheir Altamimi in Geophysical research letters, vol 30 n° 2 (Jauary 2003)PermalinkThe SLR Contribution to the ITRF / Zuheir Altamimi (2003)PermalinkITRF2000: A new release of the International Terrestrial Reference Frame for earth science applications / Zuheir Altamimi in Journal of geophysical research : Solid Earth, vol 107 n° 10 (October 2002)PermalinkITRF2000 / Zuheir Altamimi in Bulletin d'information de l'Institut géographique national, n° 73 (septembre 2002)PermalinkNew trends for the realization of the international terrestrial reference system / Zuheir Altamimi in Advances in space research, vol 30 n° 2 (July 2002)PermalinkCompte-rendu de l'assemblée scientifique de l'AIG, Budapest, 2 - 7 septembre 2001 / Olivier Jamet (2002)PermalinkMesure de la déformation crustale en Europe occidentale par géodésie spatiale / Jean-Mathieu Nocquet (2002)PermalinkITRS, PZ-90 and WGS 84: current realizations and the related transformation parameters / Zuheir Altamimi in Journal of geodesy, vol 75 n° 11 (November 2001)PermalinkIntraplate deformation in western Europe deduced from an analysis of the International Terrestrial Reference Frame 1997 / Jean-Mathieu Nocquet in Journal of geophysical research : Solid Earth, vol 106 n° 6 (June 2001)PermalinkTowards an Integrated Global Geodetic Observing System (IGGOS). Quality analysis of some IGS weekly combined solutions with respect to ITRF / Zuheir Altamimi (01/03/2001)PermalinkITRF97 and quality analysis of IGS reference stations / Zuheir Altamimi (2001)PermalinkRecent results of the international terrestrial reference frame / Zuheir Altamimi (2001)PermalinkPreliminary analysis of the ITRF2000 / Claude Boucher (01/10/2000)PermalinkPermalinkPermalinkPermalinkL'ITRF96 : nouvelle génération de réalisation du Système International de Référence Terrestre / Zuheir Altamimi in Bulletin d'information de l'Institut géographique national, n° 69 (octobre 1998)PermalinkThe ITRF96 realization and its associated velocity field / Patrick Sillard in Geophysical research letters, vol 25 n° 17 (1 September 1998)PermalinkLe repère international de référence terrestre ITRF96 / Zuheir Altamimi (04/05/1998)PermalinkContribution de DORIS au système international de référence terrestre ITRS / Claude Boucher (27/04/1998)PermalinkEstimation de la qualité des solutions DORIS soumises à l'IERS entre 1995 et 1997 / Zuheir Altamimi (1998)PermalinkResults and analysis of the ITRF96 / Claude Boucher (1998)Permalink
HDR in 2006
IAG Vice-President