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GRACE-derived surface water mass anomalies by energy integral approach: application to continental hydrology / Guillaume Ramillien in Journal of geodesy, vol 85 n° 6 (June 2011)  

Public [article]  inJournal of geodesy > vol 85 n° 6 (June 2011) . - pp 313 - 328 Titre : GRACE-derived surface water mass anomalies by energy integral approach: application to continental hydrology Type de document : Article/Communication Auteurs : Guillaume Ramillien, Auteur ; Richard Biancale, Auteur ; et al., Auteur Année de publication : 2011 Article en page(s) : pp 313 - 328 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] anomalie de pesanteur [Termes IGN] données GRACE [Termes IGN] orbitographie [Termes IGN] pesanteur terrestre [Termes IGN] surface de l'eau [Termes IGN] variation temporelle Résumé : (Auteur) We propose an unconstrained approach to recover regional time-variations of surface mass anomalies using Level-1 Gravity Recovery and Climate Experiment (GRACE) orbit observations, for reaching spatial resolutions of a few hundreds of kilometers. Potential differences between the twin GRACE vehicles are determined along short satellite tracks using the energy integral method (i.e., integration of orbit parameters vs. time) in a quasi-inertial terrestrial reference frame. Potential differences residuals corresponding mainly to changes in continental hydrology are then obtained after removing the gravitational effects of the known geophysical phenomena that are mainly the static part of the Earth’s gravity field and time-varying contributions to gravity (Sun, Moon, planets, atmosphere, ocean, tides, variations of Earth’s rotation axis) through ad hoc models. Regional surface mass anomalies are restored from potential difference anomalies of 10 to 30-day orbits onto 1° continental grids by regularization techniques based on singular value decomposition. Error budget analysis has been made by considering the important effects of spectrum truncation, the time length of observation (or spatial coverage of the data to invert) and for different levels of noise. Numéro de notice : A2011-302 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-010-0438-7 Date de publication en ligne : 11/01/2011 En ligne : https://doi.org/10.1007/s00190-010-0438-7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31081 [article]

Exemplaires(1)

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266-2011061	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Precise orbit determination of GIOVE-B based on the CONGO network / P. Steinberger in Journal of geodesy, vol 85 n° 6 (June 2011)  

Public [article]  inJournal of geodesy > vol 85 n° 6 (June 2011) . - pp 357 - 365 Titre : Precise orbit determination of GIOVE-B based on the CONGO network Type de document : Article/Communication Auteurs : P. Steinberger, Auteur ; Urs Hugentobler, Auteur ; et al., Auteur Année de publication : 2011 Article en page(s) : pp 357 - 365 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Techniques orbitales [Termes IGN] Galileo [Termes IGN] GIOVE (satellite) [Termes IGN] orbitographie [Termes IGN] poursuite de satellite Résumé : (Auteur) GIOVE-B is one of two test satellites for the future European Global Navigation Satellite System Galileo. The Cooperative Network for GIOVE Observation (CONGO) is a global tracking network of GIOVE-capable receivers established by Deutsches Zentrum für Luft- und Raumfahrt (DLR) and Bundesamt für Kartographie und Geodäsie (BKG). This network provides the basis for the precise orbit determination of the GIOVE-B satellite for the time period 29 June till 27 October 2009 with a modified version of the Bernese GPS Software. Different arc lengths and sets of orbit parameters were tested. These tests showed that the full set of nine radiation pressure parameters resulted in a better performance than the reduced set of five parameters. An internal precision of about one to two decimeters could be demonstrated for the central day of 5-day solutions. The orbit predictions have a precision of about 1 m for a prediction period of 24 h. External validations with Satellite Laser Ranging (SLR) show residuals on the level of 12 cm. The accuracy of the final orbits is expected to be on the few decimeter level. Numéro de notice : A2011-303 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-011-0443-5 Date de publication en ligne : 29/01/2011 En ligne : https://doi.org/10.1007/s00190-011-0443-5 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31082 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
266-2011061	RAB	Revue	Centre de documentation	En réserve L003	Disponible