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Auteur J. Feltens |
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Hyperboloïdal coordinates : transformations and applications in special constructions / J. Feltens in Journal of geodesy, vol 85 n° 4 (April 2011)
[article]
Titre : Hyperboloïdal coordinates : transformations and applications in special constructions Type de document : Article/Communication Auteurs : J. Feltens, Auteur Année de publication : 2011 Article en page(s) : pp 239 - 254 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] coordonnées cartésiennes géocentriques
[Termes IGN] coordonnées ellipsoïdales
[Termes IGN] ellipsoïde de référence
[Termes IGN] ouvrage d'art
[Termes IGN] surveillance d'ouvrage
[Termes IGN] transformation de coordonnéesRésumé : (Auteur) The vector-based algorithms for biaxial and triaxial ellipsoidal coordinates presented by Feltens (J Geod 82: 493-504, 2008; 83: 129-137, 2009) have been extended to hyperboloids of one sheet. For the backward transformation from Cartesian to hyperboloidal coordinates, of two iterative process candidates one was identified to be well suited. It turned out that a careful selection of the center of curvature is essential for the establishment of a stable and reliable iteration process. In addition, for zero hyperboloidal heights a closed solution is presented. The hyperboloid algorithms are again based on simple formulae and have been successfully tested for various theoretical hyperboloids. The paper concludes with a practical application on a cooling construction. Numéro de notice : A2011-181 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-010-0432-0 Date de publication en ligne : 10/12/2010 En ligne : https://doi.org/10.1007/s00190-010-0432-0 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30959
in Journal of geodesy > vol 85 n° 4 (April 2011) . - pp 239 - 254[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2011041 RAB Revue Centre de documentation En réserve L003 Disponible Vector methods to compute azimuth, elevation, ellipsoidal, normal, and the cartesian (XYZ) to geodetic (p , a , h) transformation / J. Feltens in Journal of geodesy, vol 82 n° 8 (August 2008)
[article]
Titre : Vector methods to compute azimuth, elevation, ellipsoidal, normal, and the cartesian (XYZ) to geodetic (p , a , h) transformation Type de document : Article/Communication Auteurs : J. Feltens, Auteur Année de publication : 2008 Article en page(s) : pp 493 - 504 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] coordonnées cartésiennes
[Termes IGN] coordonnées géographiques
[Termes IGN] transformation de coordonnéesRésumé : (Auteur) Vector-based algorithms for the computation of azimuth, elevation and the ellipsoidal normal unit vector from 3D Cartesian coordinates are presented. As a by-product, the formulae for the ellipsoidal normal vector can also be used to iteratively transform rectangular Cartesian coordinates (X, Y, Z) into geodetic coordinates for a height range from -5600 km to 108 km. Comparisons with existing methods indicate that the new transformation can compete with them. Copyright Springer Numéro de notice : A2008-321 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-007-0198-1 En ligne : https://doi.org/10.1007/s00190-007-0198-1 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29314
in Journal of geodesy > vol 82 n° 8 (August 2008) . - pp 493 - 504[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-08071 RAB Revue Centre de documentation En réserve L003 Disponible 266-08072 RAB Revue Centre de documentation En réserve L003 Disponible Nicht-gravitative Störeinflüsse bei der Modellierung von GPS-Erdumlaufbahnen / J. Feltens (1991)
Titre : Nicht-gravitative Störeinflüsse bei der Modellierung von GPS-Erdumlaufbahnen Titre original : [L'influence des forces non gravitationnelles dans la modélisation de la trajectoire de satellites GPS] Type de document : Thèse/HDR Auteurs : J. Feltens, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1991 Collection : DGK - C Sous-collection : Dissertationen num. 371 Importance : 418 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9418-5 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] Fortran
[Termes IGN] orbitographie
[Termes IGN] phase GPS
[Termes IGN] satellite GPSIndex. décimale : 30.61 Systèmes de Positionnement par Satellites du GNSS Résumé : (Auteur) This dissertation will be concerned with a detailed consideration of the force field influencing a GPS satellite's orbital motion around the Earth. Special attention will be paid to the so-called "non-gravitational" forces acting on GPS spacecraft. Starting with a small introduction in Chapter 1, Chapter 2 follows with some basics that are generally needed for the mathematical description and computation of earth-satellite orbits. In Chapter 3, a detailed consideration of all gravitational disturbing forces, that are relevant for GPS orbits, will be performed. Concerning the orbital disturbances coming from the Moon's gravitational attraction, the formula for the description of third-body attractions of point masses will be extended to account for inhomogenities in the lunar gravitational field. Chapter 4 is the largest one of the dissertation and deals with different non-gravitational forces that may act on an earth-satellite, especially on GPS spacecraft. In the first part of Chapter 4, a general analysis will be done to look, which of these non-conservative forces might be relevant for high altitude satellites, such as GPS satellites. Based on a comparison and the analysis of different existing solar radiation pressure models, currently being used for GPS orbit computations, a new extended solar pressure model will be developed. Considerable improvements, especially in thermal emission modelling will be done. In addition, some further non-gravitational force components, coming from the emission of radiowave beams and of heat, are included too. Also the modelling of Earth- and Moon-shadow passages will be considered in detail, including cooling off - and heating up processes during - and after shadow passes. From its general conception, this new solar radiation pressure model is applicable to others than GPS spacecraft too. Chapter 4 ends with an application of this new, extended solar pressure model to GPS BLOCK I und BLOCK II satellites as well as to Soviet GLONASS spacecraft and a simple cylindrically shaped satellite construction. Chapter 5 shall give an overview over some principles of GPS phase observation evaluations. Such observables can be used for the performance of GPS orbit improvements and may therefore serve for the verification of the GPS force model fidelity. In Chapter 6 some numerical results will be presented. For the performance of the computations, a complete orbit integration program, including the integration of the variational equations as well as the selection between - and the invocation of different solar radiation pressure models, has been established, together with a GPS phase evaluation program. Both codes are written in FORTRAN language. Unfortunately, the GPS phase data provided to the author, needs a pre-processing with pseudorange data for the determination of satellite- and receiver clock behaviour. Since such a pseudorange evaluation program has not been available, a lot of numerical tests had to be dropped. Other numerical tests will be done, looking for some possible resonance effects that might come from solar radiation pressure. Further numerical tests shall give an insight, whether - and if yes - how the inhomogeneous lunar gravitational field may influence the orbital motion of an earth-orbiting satellite. Several constellations between spacecraft, Earth and Moon will be considered in this analysis. Finally Chapter 7 will give some conclusions and in this way finish the Ph.D. Thesis. Numéro de notice : 28099 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63446 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 28099-01 30.61 Livre Centre de documentation Géodésie Disponible 28099-02 30.61 Livre Centre de documentation Géodésie Disponible