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Titre : Double differencing Type de document : Article/Communication Auteurs : Huibert-Jan Lekkerkerk, Auteur Année de publication : 2008 Article en page(s) : pp 30 - 31 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] BeiDou
[Termes IGN] double différence
[Termes IGN] Galileo
[Termes IGN] Global Navigation Satellite System
[Termes IGN] Global Orbitography Navigation Satellite System
[Termes IGN] positionnement cinématique en temps réel
[Termes IGN] positionnement par GalileoRésumé : (Auteur) While researchers from Delft University have annouced the first double-difference measurements from Galileo satellites, the United States is proposing to discontinue the L1 and the L2 P (Y) codes that are currently being used by almost all commercial RTK receivers. Copyright GEOinformatics Numéro de notice : A2008-343 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29336
in Geoinformatics > vol 11 n° 6 (01/09/2008) . - pp 30 - 31[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 262-08061 SL Revue Centre de documentation Revues en salle Disponible
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Titre : Innovative location based services Type de document : Article/Communication Auteurs : F. Fischer, Auteur Année de publication : 2008 Article en page(s) : pp 24 - 29 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] Allemagne
[Termes IGN] diffusion de l'information
[Termes IGN] logiciel SIG
[Termes IGN] loisir
[Termes IGN] navigation terrestre
[Termes IGN] Open geospatial consortium
[Termes IGN] plateforme logicielle
[Termes IGN] service fondé sur la positionRésumé : (Auteur) In june, I visited i-locate, a start-up for mobile geo-services in Regensburg, Germany. The associates of i-locate, Ralph Buchfelder and Fabian Angerer, invited me for a talk about their new mobile service, Freitimer. Freitimer is a location-based community service for free-time activities which was launched in autumn 2008. The interview turned out to be a gripping conversation about the stony ground of location-based service operators and the future prospects of mobile information systems. Copyright GEOinformatics Numéro de notice : A2008-342 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29335
in Geoinformatics > vol 11 n° 6 (01/09/2008) . - pp 24 - 29[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 262-08061 SL Revue Centre de documentation Revues en salle Disponible Online precise point positioning: a new, timely service from Natural Resources Canada / Y. Mireault in GPS world, vol 19 n° 9 (September 2008)
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Titre : Online precise point positioning: a new, timely service from Natural Resources Canada Type de document : Article/Communication Auteurs : Y. Mireault, Auteur ; P. Tetreault, Auteur ; François Lahaye, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 59 - 64 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] Canada
[Termes IGN] positionnement ponctuel précis
[Termes IGN] serveur web
[Termes IGN] temps réel
[Termes IGN] traitement de données GNSSRésumé : (Editeur) Meliora sequamur - let us strive to improve. The words that the Roman poet Virgil wrote some 2,000 years ago could well be the watchwords of those scientists and engineers who today work to improve the accuracy, coverage, and timeliness of GPS-based positioning. They are particularly appropriate for those seeking to improve the technique of precise point positioning or PPP. PPP is a single-receiver positioning technique just like conventional pseudorange-based positioning, which takes place inside a receiver. However, the similarity stops there. PPP uses the receiver's very precise undifferenced carrier-phase observations together with very precise (and accurate) satellite orbits and clocks to achieve positioning accuracies at the few centimeter level or better. And unlike differential techniques such as real-time kinematic (RTK) positioning, all of the physical phenomena affecting the measurements must be very accurately modeled. These include solid earth tides, ocean-tide loading, transmitting and receiving antenna phase-center offsets and variations, carrier-phase wind-up, relativistic effects, and so on. With differential techniques, such effects are greatly reduced and typically become insignificant, especially on short baselines. PPP can be used to process data collected at a fixed (static) site or along a trajectory in kinematic mode or a mixture of the two - "stop and go" PPP. Although introduced in the late 1990s, PPP has only become more commonplace in the past few years, thanks, in part, to continued PPP development in government and university research labs. Several PPP processors are even available online. The precise satellite orbits and clocks required are provided by the International GNSS Service (IGS) and its worldwide tracking network and analysis centers. These products are supplied with some latency resulting in PPP normally being used as a post-processing technique with observations being processed some time after they are collected. However, over the past year or so efforts have been made to reduce the latency of some high-precision products. In particular, the ultra-rapid orbit and clock product of the Geodetic Survey Division of Natural Resources Canada (NRCan) is now being produced with a delay of only 90 minutes. Coupled with NRCan's online PPP engine, it provides positioning accuracies almost as good as the IGS final product, which is only available with a delay of about two weeks. In this month's column, we take a look at this new, timely service from the Great White North. Copyright Questex Media Group Inc Numéro de notice : A2008-384 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29377
in GPS world > vol 19 n° 9 (September 2008) . - pp 59 - 64[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-08091 RAB Revue Centre de documentation En réserve L003 Disponible City walk: improving GPS accuracy for urban pedestrians / J. Prost in GPS world, vol 19 n° 8 (August 2008)
[article]
Titre : City walk: improving GPS accuracy for urban pedestrians Type de document : Article/Communication Auteurs : J. Prost, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 32 - 37 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] milieu urbain
[Termes IGN] navigation pédestre
[Termes IGN] piéton
[Termes IGN] positionnement par GPSRésumé : (Editeur) A new software technology uses a Navigation Overlay Algorithm between GPS measurements and a GIS database that describes 2D footprints of buildings. The NAO uses measurements provided by GPS chipsets, functionally replacing the navigation engine. This software middleware is laid under the embedded navigation application, providing it with improved position fixes, resulting in an average improvement of cross-track errors by a factor of 3. Copyright Questex Media Group Inc Numéro de notice : A2008-322 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29315
in GPS world > vol 19 n° 8 (August 2008) . - pp 32 - 37[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-08081 RAB Revue Centre de documentation En réserve L003 Disponible AGNSS [Assisted GNSS] standardisation: the path to success in location-based services / M. Monnerat in Inside GNSS, vol 3 n° 5 (July - August 2008)
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[article]
Titre : AGNSS [Assisted GNSS] standardisation: the path to success in location-based services Type de document : Article/Communication Auteurs : M. Monnerat, Auteur Année de publication : 2008 Article en page(s) : 11 p. ; pp 22 - 33 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] European Geostationary Navigation Overlay Service
[Termes IGN] géonavigateur
[Termes IGN] GPS assisté pour la navigation (technologies)
[Termes IGN] normalisation
[Termes IGN] service fondé sur la positionRésumé : (Editeur) After a faltering start in the early 2000s, growth in mass-market LBS applications appears ready to explode, driven by implementation of GNSS capabilities on mobile handsets. Customer expectations and technological advances are contributing to the growing demand, but standardization has long been needed to provide a common framework as a real technological and market enabler. Success appeared first in the assisted GPS standard, an effort that has now progressed within the Third Generation Partnership Project to address assisted GNSS techniques in which Europe’s EGNOS and Galileo system already play and will continue to play a key part. Copyright Gibbons Media & Research LLC Numéro de notice : A2008-650 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33530
in Inside GNSS > vol 3 n° 5 (July - August 2008) . - 11 p. ; pp 22 - 33[article]Documents numériques
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AGNSS [Assisted GNSS] standardisation ... - pdf éditeurAdobe Acrobat PDFGNSS indoors: fighting the fading, part 3 / Günter W. Hein in Inside GNSS, vol 3 n° 5 (July - August 2008)
PermalinkGNSS solutions: real-time kinematic with multiple reference stations / P. Alves in Inside GNSS, vol 3 n° 5 (July - August 2008)
Permalinkvol 56 n° 223 - 01/07/2008 (Bulletin de Navigation aérienne, maritime, spatiale, terrestre) / Institut français de navigation
PermalinkComparaison du positionnement temps réel classique RTK et du positionnement GPS temps réel réseau : mise en oeuvre dans le réseau Orphéon / Laurent Morel in XYZ, n° 115 (juin - août 2008)
PermalinkGuidage et commande de machines de chantier : de l'implantation statique à celle cinématique / W. Stempfhuber in XYZ, n° 115 (juin - août 2008)
PermalinkPermalinkField-Based usability evaluation methodology for mobile geo-applications / Corné P.J.M. Van Elzakker in Cartographic journal (the), vol 45 n° 2 (May 2008)
PermalinkPerformance of GPS precise point positioning under conifer forest canopies / Erik Naesset in Photogrammetric Engineering & Remote Sensing, PERS, vol 74 n° 5 (May 2008)
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