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Optimizing Indoor GPS performance: receiver frequency standards / L.D. Vittorini in GPS world, vol 14 n° 11 (November 2003)

Public [article]  inGPS world > vol 14 n° 11 (November 2003) . - pp 40 - 48 Titre : Optimizing Indoor GPS performance: receiver frequency standards Type de document : Article/Communication Auteurs : L.D. Vittorini, Auteur ; et al., Auteur Année de publication : 2003 Article en page(s) : pp 40 - 48 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] oscillateur [Termes IGN] positionnement en intérieur [Termes IGN] positionnement par GPS [Termes IGN] récepteur GPS Résumé : (Editeur) While orbiting GPS satellites use atomic frequency standards to generate the ranging sig-nals, most GPS receivers can determine position using only a simple frequency standard: a quartz crystal oscillator. Mass-produced quartz crystal oscillators are found in virtually every piece of electronic equipment, from wristwatches to GPS receivers. Oscillators contribute only a fraction of a receiver's manufacturing cost and have helped reduce consumer cost for a basic receiver to less than $100.The common consumer GPS product sold today, however, will generally not function indoors and will have difficulty dealing with signal blockage from buildings and foliage. In recent years, engineers have developed receivers that will perform satisfactorily even with multipath-corrupted and severely attenuated signals such as those found indoors. This month's column examines the quartz crystal oscillator's role as a frequency standard in a GPS receiver and how certain characteristics of these mass-produced devices can limit per-formance for indoor use. Copyright Advanstar Communications Numéro de notice : A2003-439 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26518 [article]

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