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Bestimmung von Höhenänderungen in regionalen Netzen mit dem Global Positioning System / B. Görres (1996)
Titre : Bestimmung von Höhenänderungen in regionalen Netzen mit dem Global Positioning System Titre original : [Détermination des changements de hauteurs dans les réseaux régionaux avec le GPS] Type de document : Thèse/HDR Auteurs : B. Görres, Auteur Editeur : Francfort sur le Main : Institut für Angewandte Geodäsie Année de publication : 1996 Collection : DGK - C Sous-collection : Dissertationen num. 461 Importance : 102 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] antenne GPS
[Termes IGN] Bernese
[Termes IGN] correction troposphérique
[Termes IGN] données GPS
[Termes IGN] hauteur ellipsoïdale
[Termes IGN] réseau géodésique local
[Termes IGN] série temporelleIndex. décimale : 30.61 Systèmes de Positionnement par Satellites du GNSS Résumé : (Auteur)The Global Positioning System (GPS) provides the possibility to determine three-dimensional coordinates with very high accuracy. Promising applications present themselves for monitoring of deformations of the Earth surface. Until now applications have been focused on the horizontal components, because GPS yields them with higher accuracy. However, the height determination is strongly affected by problems related to the atmospheric refraction.
The main topic of this thesis is the development of strategies for the GPS field measurements and the processing to improve the accuracy of the vertical component. The necessary investigations are performed with data observed in a series of annual campaigns since 1993 within the GPS network HEIKO (Bestimmung von Ho'henanderungen in Eifel und KOelner Bucht). The area under investigation is a zone known for tectonic activity and anthropogenic height changes.
A detailed examination of the problems, which cause deviations in the height components, shows the importance of taking into account tropospheric refraction, phase center variations and multipath for the improvement of precise height determinations.
The studies using the "Bernese GPS Software" point out that extended observation sessions, calibration of GPS antennas and the use of low elevation satellite signals improve the repeatability of the height component. This is possible even when using standard models for the tropospheric refraction if tropospheric delay parameters are estimated. In addition it can be stated that a reliable accuracy for the height component can be given only by comparing results of several campaigns.
Using this concept the processing of the HEIKO network results in height changes of up to 25 mm/year with an average standard deviation of 2.4 mm/year. Comparisons with levelling results for identical stations in the area of brown coal mining lead to good agreement. This is of course only under the condion that gravity changes may be neglected.
The application of the proposed strategy has given accuracy results for GPS heights on distances of up to 100 km with a wrms of ± 2 mm, which is superior to the levelling accuracy on distances longer than 10 km. The conclusion points to an increasing importance of GPS for height determinations in extended networks.Numéro de notice : 28032 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63379 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 28032-01 30.61 Livre Centre de documentation Géodésie Disponible