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Results and comparisons of a local and a regional reprocessed GNSS network / Juliette Legrand in Bulletin of geodesy and geomatics BGG, vol 69 n° 2 - 3 (December 2010)
[article]
Titre : Results and comparisons of a local and a regional reprocessed GNSS network Type de document : Article/Communication Auteurs : Juliette Legrand, Auteur ; Carine Bruyninx, Auteur ; Nicolas Bergeot, Auteur Année de publication : 2010 Article en page(s) : pp 257 - 266 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] analyse comparative
[Termes IGN] Belgique
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] polyèdre
[Termes IGN] réseau géodésique localRésumé : (Auteur) This paper compares the results obtained from two homogenously reprocessed GNSS networks which are tied to a global conventional frame, namely the ITRF2005, using minimal constraints. The first network (222 stations) comprises the full EUREF Permanent Network (EPN). The second network is a smaller local network consisting of the national dense Belgian network and 38 EPN stations located in and around Belgium. We show that in reason of the network effect, it is impossible to mix the results of both cumulative solutions. Indeed, the position differences between both networks tied to the ITRF2005 using minimal constraints can reach 6.3 mm for the horizontal and 9.6 mm for the vertical. For the velocities, the differences reach 0.5 mm/yr for the horizontal and 2.4 mm/yr for the vertical. In order to mitigate these differences and to obtain a consistent set of station positions and velocities, the two solutions were combined on a weekly basis and then the combined weekly solutions were stacked to obtain a cumulative solution expressed in ITRF2005. The results demonstrate that the network effect on the local solution can be eliminated. This approach is valid thanks to the agreement between the weekly polyhedrons of both solutions as the same data analysis strategy was applied during both reprocessing. Numéro de notice : A2010-599 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31343
in Bulletin of geodesy and geomatics BGG > vol 69 n° 2 - 3 (December 2010) . - pp 257 - 266[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 013-2010021 RAB Revue Centre de documentation En réserve L003 Disponible Estimation of phase center corrections for GLONASS-M satellite antennas / F. Dilssner in Journal of geodesy, vol 84 n° 8 (August 2010)
[article]
Titre : Estimation of phase center corrections for GLONASS-M satellite antennas Type de document : Article/Communication Auteurs : F. Dilssner, Auteur ; T. Spinger, Auteur ; Claudia Flohrer, Auteur ; John M. Dow, Auteur Année de publication : 2010 Article en page(s) : pp 467 - 480 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal
[Termes IGN] antenne GLONASS
[Termes IGN] centre de phase
[Termes IGN] correction du signal
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] mesurage de phase
[Termes IGN] positionnement par GNSS
[Termes IGN] satellite GLONASS
[Termes IGN] station GLONASS
[Termes IGN] traitement du signalRésumé : (Auteur) Driven by the comprehensive modernization of theGLONASS space segment and the increased global availability of GLONASS-capable ground stations, an updated set of satellite-specific antenna phase center corrections for the current GLONASS-M constellation is determined by processing 84 weeks of dual-frequency data collected between January 2008 and August 2009 by a worldwide network of 227 GPS-only and 115 combined GPS/GLONASS tracking stations. The analysis is performed according to a rigorous combined multi-system processing scheme providing full consistency between the GPS and the GLONASS system. The solution is aligned to a realization of the International Terrestrial Reference Frame 2005. The estimated antenna parameters are compared with the model values currently used within the International GNSS Service (IGS). It is shown that the z-offset estimates are on average 7 cm smaller than the corresponding IGS model values and that the block-specific mean value perfectly agrees with the nominal GLONASS-M z-offset provided by the satellite manufacturer. The existence of azimuth-dependent phase center variations is investigated and uncertainties in the horizontal offset estimates due to mathematical correlations and yaw-attitude modeling problems during eclipse seasons are addressed. Finally, it is demonstrated that the orbit quality benefits from the updated GLONASS-M antenna phase center model and that a consistent set of satellite antenna z-offsets for GPS and GLONASS is imperative to obtain consistent GPS- and GLONASS-derived station heights. Numéro de notice : A2010-439 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-010-0381-7 Date de publication en ligne : 08/04/2010 En ligne : https://doi.org/10.1007/s00190-010-0381-7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30632
in Journal of geodesy > vol 84 n° 8 (August 2010) . - pp 467 - 480[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2010081 SL Revue Centre de documentation Revues en salle Disponible On secular geocenter motion: The impact of climate changes / Laurent Métivier in Earth and planetary science letters, vol 296 n° 3-4 (August 2010)
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Titre : On secular geocenter motion: The impact of climate changes Type de document : Article/Communication Auteurs : Laurent Métivier , Auteur ; Marianne Greff-Lefftz, Auteur ; Zuheir Altamimi , Auteur Année de publication : 2010 Article en page(s) : pp 360 - 366 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] changement climatique
[Termes IGN] eau de fonte
[Termes IGN] géocentre
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] mouvement du géocentre
[Termes IGN] système de référence mondialRésumé : (auteur) We investigate the impact of recent climate changes on the long-term displacement of the Center of Figure (CF) of the Earth (also defined as the geocenter in our convention) with respect to the Center of Mass of the whole Earth (CM). The two realizations of the International Terrestrial Reference System (ITRS), entitled ITRF2000 and ITRF2005, present a difference of 1.8 mm/yr between the velocities of their respective frame origins, suggesting an acceleration of the geocenter towards the North Pole. We investigate if such a displacement could be explained by geophysical phenomena, such as the present ice melting and the sea level rise. Using published observations on ice caps and glaciers, we calculated the range of geocenter motion that may occur today. We found that the global ice melting induces long-term displacements of the geocenter mainly along the Z-axis, toward the North Pole. The geocenter velocity is today between 0.3 and 0.7–0.8 mm/yr and has doubled during last decade with the recent acceleration of ice melting. Combining with Greff-Lefftz (2000) results on post-glacial rebound, we conclude that a present secular geocenter velocity of 1 mm/yr is possible. However, the recent increase of the geocenter velocity cannot explain the difference observed between the two last realizations of the ITRS. Our results comfort the previous conclusions about ITRF2000 and ITRF2005 and the pre-analysis of ITRF2008 data, suggesting that the large Z-translation rate between the ITRS realizations is probably due to an imprecise ITRF2000 origin. Finally, we show that determining precisely the geocenter velocity would give a new type of information that may be useful to more precisely constrain mass exchanges associated with climate changes. Numéro de notice : A2010-615 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.epsl.2010.05.021 Date de publication en ligne : 29/06/2010 En ligne : https://doi.org/10.1016/j.epsl.2010.05.021 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=86682
in Earth and planetary science letters > vol 296 n° 3-4 (August 2010) . - pp 360 - 366[article]Topographically 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)
[article]
Titre : 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 : 2010 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] déformation verticale de la croute terrestre
[Termes IGN] hauteur ellipsoïdale
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] positionnement par GPS
[Termes IGN] pression atmosphérique
[Termes IGN] résidu
[Termes IGN] série temporelle
[Termes IGN] surcharge atmosphériqueRésumé : (auteur) Atmospheric pressure variations are known to induce vertical displacements of the Earth's surface with magnitudes large enough to be detected by geodetic observations. Estimates of these loading effects are derived using global reanalysis fields of surface pressure as input. The input surface pressure has a minimum spatial sampling, which does not capture true surface pressure variations due to high topographic variability in some regions. In this paper, we investigate the effect that unmodeled topographic variability has on surface pressure estimates and subsequent estimates of vertical surface displacements. We find that the estimated height changes from the topographic surface pressure can be significant (2–4 mm) for sites in regions of high topographic variability. When we compare the estimated height changes to Global Positioning System residuals from the 2005 International Terrestrial Reference Frame Realization, we find that the heights derived from the topographic surface pressure, versus those from the normal surface pressure, perform better at reducing the scatter on the height coordinate time series. Numéro de notice : A2010-657 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1029/2009JB006810 Date de publication en ligne : 29/07/2010 En ligne : https://doi.org/10.1029/2009JB006810 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91744
in Journal of geophysical research : Solid Earth > Vol 115 n° B7 (July 2010)[article]Voir aussiDocuments numériques
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Topographically induced height errors ... - pdf éditeurAdobe Acrobat PDF Contributions of the French Institut Géographique National (IGN) to the International DORIS Service / Pascal Willis in Advances in space research, vol 45 n° 12 (15/06/2010)
[article]
Titre : Contributions of the French Institut Géographique National (IGN) to the International DORIS Service Type de document : Article/Communication Auteurs : Pascal Willis , Auteur ; Claude Boucher , Auteur ; Hervé Fagard, Auteur ; Bruno Garayt , Auteur ; Marie-Line Gobinddass , Auteur Année de publication : 2010 Article en page(s) : pp 1470 - 1480 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] données DORIS
[Termes IGN] International DORIS Service
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] mouvement du pôle
[Termes IGN] positionnement par DORIS
[Termes IGN] réseau DorisRésumé : (Auteur) DORIS is one of the four geodetic space techniques participating to the Global Geodetic Observing System (GGOS). Since the early development of this system, the Institut Géographique National played a specific and active role. Within, the International DORIS Service (IDS), IGN is in a particular position. While it is responsible for the installation and the maintenance of the DORIS ground tracking stations, it also handles one of the two IDS data center delivering DORIS data and products and has been an IDS Analysis Center for years, providing all possible IDS products, in particular the latest ignwd08 time series in preparation of ITRF2008. This paper explains the different aspects of the IGN contribution to IDS from an historical point of view, presents current activities and scientific results and provides a perspective for future activities. Recent DORIS results show a 10 mm precision or better when more than four DORIS satellites are available. Comparisons between recent DORIS solutions (ign07d02 and ign09d02) and past ITRF realizations show that errors are shared between the DORIS and the ITRF realizations. Some problems related to DORIS data processing are also discussed and possible ways to solve them in the future are discussed. In particular, we can now reject the tropospheric origin of the problem detected in the Envisat data after the software upload of October 12, 2004. A few applications in geodesy (terrestrial reference frame, Earth's polar motion) and geophysics are also discussed as a natural extension of these service-type activities. Numéro de notice : A2010-361 Affiliation des auteurs : IGN+Ext (2012-2019) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2009.09.019 Date de publication en ligne : 02/10/2009 En ligne : https://doi.org/10.1016/j.asr.2009.09.019 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30555
in Advances in space research > vol 45 n° 12 (15/06/2010) . - pp 1470 - 1480[article]GSFC DORIS contribution to ITRF2008 / Karine Le Bail in Advances in space research, vol 45 n° 12 (15/06/2010)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)PermalinkThe angular velocities of the plates and the velocity of Earth's centre from space geodesy / Donald F. Argus in Geophysical journal international, vol 180 n° 3 (March 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])PermalinkEstimation of crustal vertical movements with GPS in a geocentric frame, within the framework of the TIGA project / Alvaro Santamaria Gomez (2010)PermalinkEtude des erreurs systématiques liées à la détermination du géocentre par les mesures DORIS / Marie-Line Gobinddass (2010)PermalinkPermalinkGlobal optimization of core station networks for space geodesy: application to the referencing of the SLR EOP with respect to ITRF / David Coulot in Journal of geodesy, vol 84 n° 1 (January 2010)PermalinkPermalink