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Titre : vol 44 n° 11 - 1 December 2009 Type de document : Périodique Année de publication : 2009 Importance : 143 p. Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] altimétrie
[Termes IGN] données DORIS
[Termes IGN] International DORIS Service
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] réseau DorisNuméro de notice : sans Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Numéro de périodique En ligne : http://www.sciencedirect.com/science/journal/02731177/44/11 Format de la ressource électronique : URL sommaire Permalink : https://documentation.ensg.eu/index.php?lvl=bulletin_display&id=34668 [n° ou bulletin]Improving DORIS geocenter time series using an empirical rescaling of solar radiation pressure models / Marie-Line Gobinddass in Advances in space research, vol 44 n° 11 (1 December 2009)
[article]
Titre : Improving DORIS geocenter time series using an empirical rescaling of solar radiation pressure models Type de document : Article/Communication Auteurs : Marie-Line Gobinddass , Auteur ; Pascal Willis , Auteur ; Olivier de Viron, Auteur ; Ant Sibthorpe, Auteur ; Nikita P. Zelensky, Auteur ; J.C. Ries, Auteur ; Rémi Ferland, Auteur ; Yoaz E. Bar-Sever, Auteur ; Michel Diament , Auteur ; Franck G. Lemoine, Auteur Année de publication : 2009 Article en page(s) : pp 1279 - 1287 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] données DORIS
[Termes IGN] erreur systématiqueRésumé : (auteur) Even if Satellite Laser Ranging (SLR) remains the fundamental technique for geocenter monitoring, DORIS can also determine this geophysical parameter. Gobinddass et al. (2009) found that part of the systematic errors at 118 days and 1 year can be significantly reduced by rescaling the current solar radiation pressure models using satellite-dependent empirical models. Here we extend this study to all DORIS satellites and propose a complete set of empirical solar radiation parameter coefficients. A specific problem related to SPOT-5 solar panel realignment is also detected and explained. New DORIS geocenter solutions now show a much better agreement in amplitude with independent SLR solutions and with recent geophysical models. Finally, the impact of this refined DORIS data strategy is discussed in terms of Z-geocenter monitoring as well as for other geodetic products (altitude of high latitude station such as Thule in Greenland) and Precise Orbit Determination. After reprocessing the full 1993.0-2008.0 DORIS data set, we confirm that the proposed strategy allows a significant reduction of systematic errors at periods of 118 days and 1 year (up to 20 mm), especially for the most recent data after 2002.5, when more DORIS satellites are available for geodetic purposes. Numéro de notice : A2009-609 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2009.08.004 Date de publication en ligne : 08/08/2009 En ligne : https://doi.org/10.1016/j.asr.2009.08.004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102372
in Advances in space research > vol 44 n° 11 (1 December 2009) . - pp 1279 - 1287[article]Investigating tropospheric effects and seasonal position variations in GPS and DORIS time-series from the Nepal Himalaya / Mireille Flouzat in Geophysical journal international, vol 178 n° 3 (September 2009)
[article]
Titre : Investigating tropospheric effects and seasonal position variations in GPS and DORIS time-series from the Nepal Himalaya Type de document : Article/Communication Auteurs : Mireille Flouzat, Auteur ; Pierre Bettinelli, Auteur ; Pascal Willis , Auteur ; Jean-Philippe Avouac, Auteur ; Thierry Héritier, Auteur ; Umesh Gautam, Auteur Année de publication : 2009 Projets : 1-Pas de projet / Article en page(s) : pp 1246 - 1259 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] données DORIS
[Termes IGN] données GPS
[Termes IGN] Himalaya
[Termes IGN] propagation troposphérique
[Termes IGN] série temporelle
[Termes IGN] variation saisonnièreRésumé : (auteur) Geodetic time-series from continuous GPS (cGPS) and 1 DORIS stations across the Himalaya of central Nepal show strong seasonal fluctuations observed on the horizontal and vertical components. Because the fluctuations determined at the different stations have similar phase but different amplitudes, these observations would imply that the secular shortening across the range is modulated by a seasonal strain. Given the geographic and climatic setting, there is however a possibility that the GPS positions be biased by tropospheric effects. We process these data using two different software packages and two different analysis strategies. Our analysis shows evidence for 1-strong seasonal fluctuation of zenithal delays consistent with in situ meteorological data and two strong horizontal tropospheric gradients in particular in the EW direction, that is, parallel to the mountain front at Gumba, also detected in DORIS results. We show that the tropospheric effects cannot however be the source of the observed seasonality of horizontal strain. This study supports the view that the seasonal strain in the Himalaya is real and probably driven by seasonal surface load variations. Our study adds support to the view that seasonal variations of seismicity in the Himalaya reflects seasonal variations of geodetic strain. Numéro de notice : A2009-604 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1365-246X.2009.04252.x En ligne : https://doi.org/10.1111/j.1365-246X.2009.04252.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95755
in Geophysical journal international > vol 178 n° 3 (September 2009) . - pp 1246 - 1259[article]Systematic biases in DORIS-derived geocenter time series related to solar radiation pressure mis-modeling / Marie-Line Gobinddass in Journal of geodesy, vol 83 n° 9 (September 2009)
[article]
Titre : Systematic biases in DORIS-derived geocenter time series related to solar radiation pressure mis-modeling Type de document : Article/Communication Auteurs : Marie-Line Gobinddass , Auteur ; Pascal Willis , Auteur ; Olivier de Viron, Auteur ; Ant Sibthorpe, Auteur ; Nikita P. Zelensky, Auteur ; J.C. Ries, Auteur ; Rémi Ferland, Auteur ; Yoaz E. Bar-Sever, Auteur ; Michel Diament , Auteur Année de publication : 2009 Article en page(s) : pp 849 - 858 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] données DORIS
[Termes IGN] erreur systématique
[Termes IGN] rayonnement solaire
[Termes IGN] série temporelleRésumé : (auteur) As any satellite geodesy technique, DORIS can monitor geocenter variations associated to mass changes within the Earth–Atmosphere–Continental hydrosphere–Oceans system. However, especially for the Z-component, corresponding to a translation of the Earth along its rotation axis, the estimated geocenter is usually affected by large systematic errors of unknown cause. By reprocessing old DORIS data, and by analyzing single satellite solutions in the frequency domain, we show that some of these errors are satellite-dependent and related to the current DORIS orbit determination strategy. In particular, a better handling of solar pressure radiation effects on SPOT-2 and TOPEX satellites is proposed which removes a large part of such artifacts. By empirically multiplying the current solar pressure model with a single coefficient (1.03 for TOPEX/Poseidon after 1993.57, and 0.96 before; and 1.08 for SPOT-2) estimated over a long time period, we can improve the measurement noise of the Z-geocenter component from 47.5 to 30.4 mm for the RMS and from 35 to 6 mm for the amplitude of the annual signal. However, the estimated SRP coefficient for SPOT-2 presents greater temporal variability, indicating that a new, dedicated solar radiation pressure model is still needed for precise geodetic applications. In addition, for the TOPEX satellite, a clear discontinuity of unknown cause is also detected on July 27, 1993. Numéro de notice : A2009-599 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-009-0303-8 Date de publication en ligne : 24/01/2009 En ligne : https://doi.org/10.1007/s00190-009-0303-8 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102417
in Journal of geodesy > vol 83 n° 9 (September 2009) . - pp 849 - 858[article]Potential volcanological applications of the DORIS system. A geodetic study of the Socorro Island (Mexico) coordinate time-series / Pierre Briole in Geophysical journal international, vol 178 n° 1 (July 2009)
[article]
Titre : Potential volcanological applications of the DORIS system. A geodetic study of the Socorro Island (Mexico) coordinate time-series Type de document : Article/Communication Auteurs : Pierre Briole, Auteur ; Pascal Willis , Auteur ; Jacques Dubois, Auteur ; Olivier Charade, Auteur Année de publication : 2009 Projets : 3-projet - voir note / Article en page(s) : pp 581 - 590 Note générale : biblographie
This work was supported by the Centre National d’Etudes Spatiales (CNES)Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] données DORIS
[Termes IGN] île
[Termes IGN] Mexique
[Termes IGN] Pacifique (océan)
[Termes IGN] série temporelleRésumé : (auteur) We analysed DORIS data from Socorro Island (Mexico), providing weekly coordinates in ITRF2000 from 1900 to 2006. Careful analysis of this time-series shows horizontal and vertical movements related to recent activity of the Mt. Evermannn volcano. A deflation of the volcano between 1993 and 1996 (−94 mm yr−1 in the N23°W direction, directly pointing in the direction of the crater summit) is observed. We identify also a clear horizontal discontinuity of 81 mm and a significant change in velocity on 2002 October 3. We use a Mogi formalism to provide constraints from our geodetic results on the successive locations and size of the depletion and inflation sources. Our model is consistent with a deflation source for the period 1993–1996 located beneath Mt. Evermannn at a depth of about 6.2 km below sea level. However, our data constrain only the azimuth and dip angles of the source, which could be located elsewhere along the azimuth of the summit, depth and volume varying linearly with the distance. Numéro de notice : A2009-590 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1365-246X.2009.04087.x Date de publication en ligne : 01/07/2009 En ligne : https://doi.org/10.1111/j.1365-246X.2009.04087.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=96195
in Geophysical journal international > vol 178 n° 1 (July 2009) . - pp 581 - 590[article]Etude du cycle de l’eau à partir de modèles numériques de prévision météorologique et d’observations sur l’Afrique du Nord / Maïté Lacarra (2009)PermalinkThe international Doris service, IDS activity report, January 2006 - December 2008 / Pierre Tavernier (2009)PermalinkAnalysis of a possible future degradation in the DORIS geodetic results related to changes in the satellite constellation / Pascal Willis in Advances in space research, vol 39 n° 10 (May 2007)PermalinkDORIS satellite phase center determination and consequences on the derived scale of the Terrestrial Reference Frame / Pascal Willis in Advances in space research, vol 39 n° 10 (May 2007)PermalinkDORIS contribution to ITRF2005 / Zuheir Altamimi in Journal of geodesy, vol 80 n° 8-11 (November 2006)PermalinkDoris: from orbit determination for altimeter missions to geodesy / Pascal Willis in Comptes rendus : Géoscience, vol 338 n° 14-15 (November 2006)PermalinkError analysis of weekly station coordinates in the DORIS network / Simon D.P. Williams in Journal of geodesy, vol 80 n° 8-11 (November 2006)PermalinkEstimating the noise in space-geodetic positioning: the case of DORIS / Karine Le Bail in Journal of geodesy, vol 80 n° 8-11 (November 2006)PermalinkFirst results of DORIS data analysis at Geodetic Observatory Pecný / Petr Štěpánek in Journal of geodesy, vol 80 n° 8-11 (November 2006)PermalinkPlate Motion of India and Interseismic Strain in the Nepal Himalaya from GPS and DORIS Measurements / Pierre Bettinelli in Journal of geodesy, vol 80 n° 8-11 (November 2006)Permalink