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Network RTK: getting ready for GNSS modernization / H. Landau in GPS world, vol 18 n° 4 (April 2007)

Public [article]  inGPS world > vol 18 n° 4 (April 2007) . - pp 50 - 55 Titre : Network RTK: getting ready for GNSS modernization Type de document : Article/Communication Auteurs : H. Landau, Auteur ; X. Chen, Auteur ; A. Kipka, Auteur ; et al., Auteur Année de publication : 2007 Article en page(s) : pp 50 - 55 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] ambiguïté entière [Termes IGN] filtre de Kalman [Termes IGN] Global Navigation Satellite System [Termes IGN] instrumentation Trimble [Termes IGN] mesurage de pseudo-distance [Termes IGN] positionnement cinématique en temps réel [Termes IGN] récepteur GNSS [Termes IGN] station virtuelle de référence Résumé : (Editeur) Surveyors and geodesists pioneered the use of GPS carrier-phase positioning in the early 1980s when only a few Block I test satellites were in orbit. Receiver measurements were recorded simultaneously at project or rover sites and a reference site and, after collection, the data were post-processed back in the office. Post-processing of differenced carrier phases became a standard high-accuracy positioning technique and is still frequently used today. However, some high-accuracy positioning and navigation tasks require real-time operations. In the mid-1990s, real-time kinematic (RTK) positioning was developed. In RTK positioning, a receiver at a reference site makes pseudo-range and carrier-phase measurements, which are transmitted over a radio link to one or more rover receivers in the field. A rover receiver combines its measurements with those received over the radio link and, resolving the carrier-phase ambiguities, accurately determines its coordinates. Because atmospheric and satellite-position errors decorrelate with increasing distance between reference and rover receivers, the ability to perform successful ambiguity resolution decreases with distance as well. This limits the effective distance between reference stations and rovers. To overcome this limitation efficiently, the concept of network RTK was developed where data from a number of reference stations are used in a filter to determine the measurement errors across the network and then to provide corrections to rovers or to synthesize data for a virtual reference station (VRS) in the vicinity of a particular rover. As the number of stations in a network grows, the more processing is required to generate corrections and VRS data streams. And as more satellite signals are observed by reference and rover receivers, even higher demands are placed on the network RTK filter processing. In this month's column, we look at an innovative filter technique for significantly extending the number of reference stations that can be supported for network RTK positioning under modernized GNSS. Copyright Questex Media Group Inc Numéro de notice : A2007-169 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28532 [article]

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