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Integration of GPS into hydrographic survey operations / G.S. Chisholm (1987)

Public Titre : Integration of GPS into hydrographic survey operations Type de document : Monographie Auteurs : G.S. Chisholm, Auteur Editeur : Kensington [Australie] : University of New South Wales Année de publication : 1987 Collection : Unisurv Report Sous-collection : S SERIES num. S-29 Importance : 190 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes IGN] données GPS [Termes IGN] GPS en mode différentiel [Termes IGN] hydrographie [Termes IGN] instrumentation Trimble [Termes IGN] lever bathymétrique [Termes IGN] positionnement par GPS [Termes IGN] récepteur GPS [Termes IGN] système de positionnement par satellites Index. décimale : 30.70 Navigation et positionnement Résumé : (Auteur) The main aim of this thesis is to determine if the Global Positioning System (GPS) gives sufficiently accurate and reliable horizontal positions to be used as a navigation sensor in hydrographic surveying. An overall description of GPS is presented highlighting the points that must be addressed and understood by the hydrographic survey industry if GPS is to be successfully integrated. The nature of the error sources present in the raw observations are investigated with data taken from Trimble 4000S receivers. The expected range error from a satellite for the present constellation is calculated to be 12m while that of the proposed constellation is 32m. Two methods are investigated to minimise the range error and hence improve position accuracy: the first is a sub-optimal filter which reduces range noise from 2-3m to less than 1m and, the other is differential CPS. Differential GPS is widely believed to be the method that will be implemented to reduce systematic errors and so improve accuracy. Results from processing the GPS data collected showed that the differential technique improved position accuracy from 10m to better than 3m. However if the differential method is going to be at all useful in the hydrographic environment further research needs to be carried out: for example, to monitor how different receiver types perform relative to each other as the filtering techniques may be quite different. Otherwise it is wise to use the same model of receivers when carrying out differential GPS. Integration techniques are discussed because GPS will probably have most impact in hydrographic surveying as a positioning sensor in an integrated navigation system. Numéro de notice : 49568 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=58967

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
49568-01	30.70	Livre	Centre de documentation	Géodésie	Disponible