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Auteur S. Rudolph |
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Regionale und globale Gravitationsfeldanalyse hochauflösender Satellitendaten mittels Mehrgitterverfahren / S. Rudolph (2000)
Titre : Regionale und globale Gravitationsfeldanalyse hochauflösender Satellitendaten mittels Mehrgitterverfahren Titre original : [Analyse du champ de gravitation régional et global des satellites à haute résolution grâce à des méthodes multi grilles] Type de document : Thèse/HDR Auteurs : S. Rudolph, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2000 Collection : DGK - C Sous-collection : Dissertationen num. 528 Importance : 76 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9567-0 Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] champ de gravitation
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] discrétisation
[Termes IGN] données GOCE
[Termes IGN] données GRACE
[Termes IGN] gradiométrie
[Termes IGN] lissage de données
[Termes IGN] poursuite de satelliteIndex. décimale : 30.42 Gravimétrie Résumé : (Auteur) This thesis investigates the use of multigrid methods in conjunction with gravity field recovery from satellite data. The applied methods represent not only very fast techniques for solving large and non-sparse equation systems, but also yield approximations of the gravity field on different discretization levels. This theme becomes more and more acute because of different dedicated satellite missions. They will provide almost globally distributed gravity field information of unprecedented resolution and precision. Therefore new strategies for using this information have to be developed.
In contrast to the methods based on spherical harmonics a parameterization with space-localizing base functions on a sequence of hierarchically chosen grids is used. The investigation of the unavoidable discretization errors follows. The observation equations in the case of satellite-to-satellite tracking as well as in the case of satellite gravity gradiometry are formulated. The estimation of the unknown coefficients leads to ill-conditioned and fully occupied normal equation systems. A regularization technique has to be applied in order to solve them using the multigrid methods. The transformations between the levels of discretization and the different smoothing operators are dealt with. These operators are compared in the convergence analysis and the dependence upon the ordering of the unknowns is demonstrated.
The gravity field recovery based on the developed methods is examined in simulations concerning the dedicated missions CHAMP, GRACE and GOCE. The global investigations in the case of GRACE show that the L-curve is a proper method for choosing the regularization parameter. In addition the CHAMP simulation demonstrates the effective use of this parameter determination procedure for iteration techniques. The combination of different discretization levels is a main feature of the developed method. Its application in the simulation concerning GOCE leads to a regional refinement, when the estimated gravity field of GRACE is used as a-priori information.Numéro de notice : 27823 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=56447 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 27823-01 30.42 Livre Centre de documentation Géodésie Disponible