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Auteur M. Scheinert |
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Evaluation of terrestrial and airborne gravity data over Antarctica : a generic approach / Philipp Zingerle in Journal of geodetic science, vol 9 n° 1 (January 2019)
[article]
Titre : Evaluation of terrestrial and airborne gravity data over Antarctica : a generic approach Type de document : Article/Communication Auteurs : Philipp Zingerle, Auteur ; Roland Pail, Auteur ; M. Scheinert, Auteur ; T. Schaller, Auteur Année de publication : 2019 Article en page(s) : pp 29 - 40 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] Antarctique
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] données localisées 3D
[Termes IGN] levé gravimétrique
[Termes IGN] modèle de géopotentielRésumé : (auteur) The AntGrav project, funded by the German Research Foundation (DFG) has the main objective to homogenize and optimize Antarctic gravity field information. Within this project an evaluation procedure is needed to inspect all different kind of gravity field surveys available in Antarctica. In this paper a suitable methodology is proposed.
We present an approach for fast 3D gravity point data reduction in different spectral bands. This is achieved through pre-calculating a fine 3D mesh of synthesized gravity functionals over the entirety of the Antarctic continent, for which two different global models are used: the combined satellite model GOCO05s for the long-wavelength part, and the topographic model Earth2014 for the shorter wavelengths. To maximize the applicability separate meshes are calculated for different spectral bands in order to specifically reduce a certain band or a selected combination. All meshes are calculated for gravity anomalies as well as gravity disturbances. Utilizing these meshes, synthesized gravity data at arbitrary positions is computed by conventional 3D interpolation methods (e.g. linear, cubic or spline).
It is shown that the applied approach can reach a worst-case interpolation error of less than 1 mGal. Evaluation results are presented for the AntGG grid and exemplary for the in-situ measurements of the AGAP and BAS-LAND campaigns. While general properties, large-scale errors and systematic effects can usually be detected, small-scale errors (e.g. of single points) are mostly untraceable due to the uncertainties within the topographic model.Numéro de notice : A2019-408 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1515/jogs-2019-0004 Date de publication en ligne : 19/08/2019 En ligne : https://doi.org/10.1515/jogs-2019-0004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93526
in Journal of geodetic science > vol 9 n° 1 (January 2019) . - pp 29 - 40[article]Zur Bahndynamik niedrigfliegender Satelliten / M. Scheinert (1996)
Titre : Zur Bahndynamik niedrigfliegender Satelliten Titre original : [Sur l'orbite dynamique des satellites à basse altitude] Type de document : Thèse/HDR Auteurs : M. Scheinert, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1996 Collection : DGK - C Sous-collection : Dissertationen num. 435 Importance : 140 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9478-9 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] Aristoteles
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] données GPS
[Termes IGN] équation de Hill
[Termes IGN] équation différentielle
[Termes IGN] gradiométrie
[Termes IGN] orbite
[Termes IGN] orbite circulaire
[Termes IGN] poursuite de satellite
[Termes IGN] système linéaireIndex. décimale : 30.40 Géodésie physique Résumé : (Auteur) The satellite missions ARISTOTELES and STEP, under discussion for some years, would give the chance to determine the gravitational field of the Earth with high accuracy and up to the short-wave domain. This is due to the expected highly sensitive observations of gravitational gradients fend tracking information obtained by GPS.
The goal of the hereby presented dissertation is to investigate especially the potentiality of the GPS tracking data to solve the coefficients of the long-wave domain in particular.
The theory of Hill's equations forms an excellent tool to analyse the orbit perturbations of the satellites moving in nearly polar, nearly circular orbits of very low altitude. The derivation of the linear perturbation theory is dealt with in detail. Special attention is given to the formulation of differential equations and their analytical and numerical solution.
On the basis of the linear theory numerical simulations were carried out which proofed the impossibility to solve the long-wave domain completely from tracking data of only one of the discussed satellites. But the orbit analysis allows to set up a so-called Tailored Model in each case which may support and complete the processing of the gradiometry data. Further applications of a Tailored Model, gained from an orbit analysis of ARISTOTELES or STEP, resp., are possible, e.g. in the fields of satellite altimetry or of the development of global Earth's gravity models which uses data of satellites in many different orbits.Numéro de notice : 28054 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63401 Réservation
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