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Auteur Paul Tregoning |
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Geophysical distributions of occultations of GPS satellites viewed from a low Earth orbiting satellite / D.M. O'Brien (1998)
Titre : Geophysical distributions of occultations of GPS satellites viewed from a low Earth orbiting satellite Type de document : Monographie Auteurs : D.M. O'Brien, Auteur ; Paul Tregoning, Auteur Editeur : Aspendale : CSIRO Atmospheric Research Année de publication : 1998 Collection : CSIRO Atmospheric research technical paper num. 39 Importance : 31 p. Format : 21 x 29 cm ISBN/ISSN/EAN : 978-0-643-06345-7 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] affaiblissement géométrique de la précision
[Termes IGN] antenne GPS
[Termes IGN] atmosphère terrestre
[Termes IGN] constellation GPS
[Termes IGN] distribution spatiale
[Termes IGN] météorologie
[Termes IGN] orbite basse
[Termes IGN] radiooccultation
[Termes IGN] récepteur GPS
[Termes IGN] satellite artificiel
[Termes IGN] satellite GPSIndex. décimale : 30.84 Applications de géodésie spatiale à l'atmosphère Résumé : (Auteur) The infrastructure of the Global Positioning System (GPS), with a minimum of twenty four satellites in precisely determined orbits, each transmitting on two radio frequencies of approximately 1.58 GHz and 1.23 GHz, opens new opportunities for meteorology through radio occultation. A small satellite in low earth orbit (LEO) carrying a GPS receiver will see the satellites of the GPS constellation rise and set behind the earth. From measurements of the Doppler shifts of the radio waves during occultations of the GPS satellites, it is possible to deduce the bending of the radio waves in the atmosphere of the Earth, and hence determine the density profile of the atmosphere. The method is unaffected by cloud, does not involve radiometric calibration like other remote sensing methods, and provides density soundings over the entire globe. This technical paper examines the spatial distributions of occultations for four different GPS antenna configurations on the LEO and for orbits of the LEO ranging from equatorial to polar. It is found that the most uniform spatial distribution of occultations occurs for orbits with inclinations near 60° and 120°. In addition, probability distributions are computed for the number of GPS satellites in view and the geometric dilution of precision, the latter being a measure of the accuracy with which the orbit of the LEO may be determined. Because underflight of a GPS satellites by the LEO offer an opportunity to determine the structure of the ionosphere along radial lines from the LEO to the GPS satellite, the paper also computes the frequency of underflights and their spatial distributions. Numéro de notice : 66783 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=61660 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 66783-01 30.84 Livre Centre de documentation Géodésie Disponible GPS measurements in the Australian and Indonesian regions (1989 - 1993) / Paul Tregoning (1996)
Titre : GPS measurements in the Australian and Indonesian regions (1989 - 1993) : Studies of the Java trench subduction zone, the Sunda Strait and the Australian plate Type de document : Monographie Auteurs : Paul Tregoning, Auteur Editeur : Kensington [Australie] : University of New South Wales Année de publication : 1996 Importance : 138 p. Format : 21 x 30 cm Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] Australie
[Termes IGN] déformation de la croute terrestre
[Termes IGN] nivellement
[Termes IGN] station GPS
[Termes IGN] surveillance géologique
[Termes IGN] système de référence géodésique
[Termes IGN] tectoniqueIndex. décimale : 30.80 Applications diverses de géodésie spatiale Résumé : (auteur) [...] This thesis investigated the tectonic activity of this collision zone by geodetically measuring motions across tectonic boundaries. There is an island, Christmas Island, located on the Australian plate about 150 km South of the subduction zone. Global Positioning System (GPS) measurements across the Java Trench were made between Christmas Island and West Java during five annual surveys commencing in 1989. This single baseline study was expanded in 1992 to include the Cocos Islands, located about 900 km Westsouthwest of Christmas Island, and a five station network spanning the Sunda Strait and the Southeastern end of the Central Sumatra Fault.
The data processed in this thesis is a subset of a much larger crustal deformation study encompassing most of Indonesia. In addition, the deformation surveys were supported by GPS measurements from a global fiducial tracking network which included some stations on the Australian plate. The GPS data was processed using GAMIT/GLOBK software to determine GPS derived station velocities and relative motions across the plate boundaries. Daily GPS solutions were computed, with global orbits being estimated using the available fiducial tracking data. The global data was quite sparse prior to 1992 and hence was incorporated in the regional solutions. With the introduction of the International GPS Service for Geodynamics (IGS) in 1992 the number of fiducial tracking stations increased significantly. It was decided to use a combination approach whereby the regional and global data was processed separately in GAMIT and then combined in GLOBK.[...]Note de contenu : bibliographie Numéro de notice : 15976 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82423 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15976-01 30.80 Livre Centre de documentation Géodésie Disponible