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Galileo frequency and signal design / Günter W. Hein in GPS world, vol 14 n° 6 (June 2003)

Public [article]  inGPS world > vol 14 n° 6 (June 2003) . - pp 30 - 37 Titre : Galileo frequency and signal design Type de document : Article/Communication Auteurs : Günter W. Hein, Auteur ; J. Godet, Auteur ; Jean-Luc Issler, Auteur ; et al., Auteur Année de publication : 2003 Article en page(s) : pp 30 - 37 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] fréquence [Termes IGN] Galileo [Termes IGN] signal Galileo Résumé : (Auteur) Europe's program to develop an independent satellite-based positioning system - Galileo -seeks to balance several goals : taking advantage of technological innovation while optimizing the compatibility and interoperability of Galileo and GPS. Over the past two years, a task force of experts has developed a proposal for a Galileo frequency plan and signal design that can help meet these goals. This article describes the current status of their efforts. Numéro de notice : A2003-422 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26502 [article]

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Galileo performance: GPS interoperability and discriminators for urban and indoor environments / M. O'donnell in GPS world, vol 14 n° 6 (June 2003)

Public [article]  inGPS world > vol 14 n° 6 (June 2003) . - pp 38 - 45 Titre : Galileo performance: GPS interoperability and discriminators for urban and indoor environments Type de document : Article/Communication Auteurs : M. O'donnell, Auteur ; T. Watson, Auteur ; J. Fisher, Auteur ; et al., Auteur Année de publication : 2003 Article en page(s) : pp 38 - 45 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] densité de population [Termes IGN] Europe (géographie politique) [Termes IGN] Galileo [Termes IGN] interopérabilité [Termes IGN] milieu urbain [Termes IGN] population urbaine [Termes IGN] positionnement en intérieur [Termes IGN] signal Galileo [Termes IGN] signal GPS Résumé : (Auteur) A technical study examines potential discriminators for Galileo mass-market acceptance in the presence of a freely available GPS service. This approach seeks to provide commercial input to the Galileo signal design process, to optimize the GPS + Galileo "super constellation" for urban operation over Europe. The analysis further shows that GPS alone does not offer sufficient availability for "transparent" mass-market use in densely populated areas. Copyright Questex Media Group Inc Numéro de notice : A2003-423 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26503 [article]

Exemplaires(1)

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067-03061	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Multipath mitigation: how good can it get with new signals ? / L.R. Weill in GPS world, vol 14 n° 6 (June 2003)

Public [article]  inGPS world > vol 14 n° 6 (June 2003) . - pp 106 - 106 Titre : Multipath mitigation: how good can it get with new signals ? Type de document : Article/Communication Auteurs : L.R. Weill, Auteur Année de publication : 2003 Article en page(s) : pp 106 - 106 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] bruit blanc [Termes IGN] classification par maximum de vraisemblance [Termes IGN] code GPS [Termes IGN] correction du signal [Termes IGN] densité spectrale de puissance [Termes IGN] signal GPS [Termes IGN] trajet multiple Résumé : (Auteur) Answer: The winner of the 1971 Nobel Prize for Physics. The question? Who defined the most important signal parameter for controlling GPS multipath? The British/Hungarian physicist Dennis Gabor won the prize for the invention of holography. However, Gabor was also one of a handful of mathematicians and scientists who developed communication theory during the 1940s. Communication theory, also called information theory, is the branch of mathematics that deals with the efficient and accurate transmission of information-bearing signals from one place to another. Key to the theory is the concept of signal bandwidth. Now bandwidth can be defined in a number of different ways, but the particular bandwidth named after Cabor determines, in part, how accurately a GPS receiver can measure pseudorange or carrier phase in the presence of multipath. The Gabor bandwidth is determined by the particular shape of the signal's power spectral density function, and the larger the bandwidth the more resistant is the signal to multipath. The GPS receiver must have a processor that takes advantage of this resistance to provide measurements with minimal multipath contamination. Here, Dr Lawrence Weill outlines an implementation of a multipath mitigation algorithm based on the statistical theory of maximum likelihood and describes its expected performance with the new GPS signals soon to be available - signals characterized by a higher Cabor bandwidth than those currently transmitted. Numéro de notice : A2003-424 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26504 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
067-03061	RAB	Revue	Centre de documentation	En réserve L003	Disponible