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Use of a multi-reference GPS station network for precise 3D positioning in constricted waterway / Luis P. Fortes in International hydrographic Review, vol 77 n° 1 (01/07/2000)  

Public [article]  inInternational hydrographic Review > vol 77 n° 1 (01/07/2000) . - pp 15 - 29 Titre : Use of a multi-reference GPS station network for precise 3D positioning in constricted waterway Type de document : Article/Communication Auteurs : Luis P. Fortes, Auteur ; Gérard Lachapelle, Auteur ; Sam Ryan, Auteur ; G. Marceau, Auteur ; et al., Auteur Année de publication : 2000 Article en page(s) : pp 15 - 29 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes IGN] ambiguïté entière [Termes IGN] géopositionnement tridimensionnel [Termes IGN] GPS en mode cinématique [Termes IGN] mesurage de phase [Termes IGN] navigation fluviale [Termes IGN] niveau de l'eau [Termes IGN] positionnement cinématique en temps réel [Termes IGN] Saint-Laurent (fleuve) [Termes IGN] voie navigable Résumé : (Auteur) Numerous coastal and inland marine operations, including navigation in shallow constricted waterways require timeconsuming and expensive maintenance that includes frequent precise multibeam hydrographic surveys and dredging operations. In addition, environmental and safety concerns lead to the establishment of stringent regulations regarding the minimum under keel clearance for commercial shipping operations. The clearance is partly a function of the navigation channel charting accuracy and the ability to determine the instantaneous water level in real time. The use of realtime kinematic (RTK) GPS to provide a threedimensional accuracy of better than 10 cm has the potential to improve the effectiveness of channel maintenance and commercial navigation. In order for RTK GPS to yield such a high level of accuracy, carrier phase observables must be used. One of the most important limitations is the requirement for short distances between the ship and shorebased fixed reference stations. With the current GIPS capability, the distance should be kept to less than 15 to 20 km to assure a continuous service. Establishing reference stations with such a high density is timeconsuming, logistically difficult and results in high maintaining cost and operational reliability issues. In this paper a method to substantially reduce the number of reference stations is investigated through field trials conducted along the St. Lawrence Seaway, Canada, in 1998 and 1999. The proximity of the trials to a solar maximum resulted in a very high level of atmospheric activity and provided an opportunity to examine the advantages and limitations of both the conventional and multireference station RTK methods under such conditions. The results of the trials show that the new approach results in a substantial improvement of up to 60%. Numéro de notice : 68998 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans En ligne : https://journals.lib.unb.ca/index.php/ihr/article/view/20480/23643 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=34476 [article]