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Collective detection: enhancing GNSS receiver sensitivity by combining signals from multiple satellites / Penina Axelrad in GPS world, vol 21 n° 1 (January 2010)
[article]
Titre : Collective detection: enhancing GNSS receiver sensitivity by combining signals from multiple satellites Type de document : Article/Communication Auteurs : Penina Axelrad, Auteur ; J. Donna, Auteur ; M. Mitchell, Auteur ; S. Mohiuddin, Auteur Année de publication : 2010 Article en page(s) : pp 58 - 64 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] détection du signal
[Termes IGN] fusion de données multisource
[Termes IGN] géonavigateur
[Termes IGN] GNSS assisté pour la navigation
[Termes IGN] GPS-INS
[Termes IGN] positionnement par GNSS
[Termes IGN] qualité du signal
[Termes IGN] traitement du signalRésumé : (Auteur) [...] Poor signal reception in other than open-sky environments is still a problem with conventional GPS receivers. However, extending signal integration times and using assisted-GPS techniques can give GPS some degree of capability to operate indoors and in other restricted environments, albeit typically with reduced positioning accuracy. An antenna with sufficient gain is needed and capable systems are available on the market. The pilot channels of modernized GNSS signals will also benefit signal acquisition and tracking in challenging environments.
In this month's column, we look at a completely different approach to enhancing signal sensitivity. Rather than requiring each satellite's signal to be acquired and tracked before it can be used in the navigation solution, the new approach dubbed "collective detection" combines the received signal power from multiple satellites in a direct-to-navigation-solution procedure. Besides providing a quick coarse position solution with weak signals, this approach can be used to monitor the signal environment, aid deeply-coupled GPS/inertial navigation, and assist with terrain and feature recognition. Copyright Questex Media GroupNuméro de notice : A2010-019 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30215
in GPS world > vol 21 n° 1 (January 2010) . - pp 58 - 64[article]Réservation
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Titre : PPP, Precise Point Positioning : constraints and opportunities Type de document : Article/Communication Auteurs : Katrin Huber, Auteur ; F. Heuberger, Auteur ; Christoph Abart, Auteur ; et al., Auteur Editeur : Fédération Internationale des Géomètres FIG - International Federation of Surveyors FIG Année de publication : 2010 Conférence : FIG 2010, international congress Facing the Challenges – Building the Capacity 11/04/2010 16/04/2010 Sydney Australie OA proceedings Importance : 17 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] convergence
[Termes IGN] géonavigateur
[Termes IGN] positionnement ponctuel précis
[Termes IGN] récepteur GNSSRésumé : (Auteur) Precise Point Positioning (PPP) is a satellite based positioning technique aiming at highest accuracy in close to real-time. First investigations using dual frequency data from a single GPS receiver data for a few cm-positioning in post-processing mode have been published in 1997 by JPL. Utilizing the ionosphere free linear combination the remaining required model information like precise orbits and clocks issued by the IGS has been used. Within the last decade a number of approaches have been carried out to serve applications in close to realtime by this technique. In comparison with common techniques like DGPS or RTK, the costs are reduced, because no base stations and no simultaneous observations are necessary. On the other hand the necessary models have to be fetched either from globally acting services like IGS (orbits, satellite clocks) or from regional GNSS service providers (atmospheric delays) and standard interfaces (e.g. RTCM) have to be developed to forward this information to the rover. Further problems still to be solved are coordinate convergence periods of up to 2 hours as well as ambiguity resolution, which are harmed by non-integer calibration phase biases. These biases vanish only in difference mode and have to be determined a priori. The main focus of the research presented in this paper is to enhance the actual achievable accuracy of PPP and to reduce convergence time. Therefore detailed investigations on new PPP algorithms and methods are carried out within the project RA-PPP (Rapid Precise Point Positioning) focusing on the derivation of improved ionospheric models providing a better accuracy for single frequency users and on the use of “regional clocks” - a method to further enhance the positioning accuracy. Furthermore, linear combinations making use of new GNSS signals are investigated to improve the noise behavior with respect to commonly used linear combinations. Additionally, a PPP software module that applies the developed algorithms and techniques to real GNSS data is developed during the research project. PPP is performed by means of a commercial GNSS receiver supported by a small processing device, but much improved accuracies than operating in standard positioning mode can be achieved. Several testing and verification routines evaluate the performance of applied algorithms and individual calculation steps. Also a later modification with regard to GNSS modernization (new signals) is considered. Finally several fields of application, where the PPP technique is nowadays used and can be used in the future are presented. Numéro de notice : 14267 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Communication Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64329 Documents numériques
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14267_ppp_huber-et-al_4040.pdfAdobe Acrobat PDF Navigation 2.0 / Hassan A. Karimi in GIM international, vol 23 n° 12 (December 2009)
[article]
Titre : Navigation 2.0 Type de document : Article/Communication Auteurs : Hassan A. Karimi, Auteur ; D. Nawn, Auteur ; B. Zimmermann, Auteur Année de publication : 2009 Article en page(s) : pp 14 - 17 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] géonavigateur
[Termes IGN] point d'intérêt
[Termes IGN] réseau social
[Termes IGN] téléphonie mobile
[Termes IGN] web 2.0
[Termes IGN] web mappingRésumé : (Auteur) Navigation is a daily activity for many as they move from place to place. With increasing complexity in transportation networks has come a rising demand for navigational assistance. Over the centuries systems able to provide such assistance have evolved through three distinct eras. This article focuses on a new third era, in which navigation uses social navigation network (SoNavNet) developed at the University of Pittsburgh. Copyright GEOinformatics Numéro de notice : A2009-467 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30096
in GIM international > vol 23 n° 12 (December 2009) . - pp 14 - 17[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 061-09121 SL Revue Centre de documentation Revues en salle Disponible Coherent integration time : the longer, the better / T. Pany in Inside GNSS, vol 4 n° 6 (November - December 2009)
[article]
Titre : Coherent integration time : the longer, the better Type de document : Article/Communication Auteurs : T. Pany, Auteur ; Bernhard Riedl, Auteur ; J. Winkel, Auteur Année de publication : 2009 Article en page(s) : 10 p. ; pp 52 - 61 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] centrale inertielle
[Termes IGN] filtre de Kalman
[Termes IGN] géonavigateur
[Termes IGN] GPS assisté pour la navigation (technologies)
[Termes IGN] intégration de données
[Termes IGN] magnétomètre
[Termes IGN] navigation à l'estime
[Termes IGN] positionnement en intérieur
[Termes IGN] positionnement par WiFi
[Termes IGN] prototype
[Termes IGN] récepteur GNSS
[Termes IGN] récepteur GPS
[Termes IGN] traitement du signal
[Termes IGN] WiFiRésumé : (Auteur) A common assumption in GNSS receiver design is that the coherent integration time should be less than a few dozens of milliseconds. This makes perfect sense for today’s commercial receivers due to data bit transitions, oscillator jitter, and user dynamics. However, a coherent integration time of several seconds would mitigate three important indoor positioning problems: multipath, cross-correlation false locks, and the squaring loss. Extending the integration time has a price, typically requiring an assistance data link providing data bits (or the use of pilot signals), a stable oscillator, and a sophisticated GNSS/INS integration to compensate for non-linear user motion. This column describes how those issues have been solved and the resulting benefits as demonstrated by a recently built prototype with a sensitivity of around 1.5 dBHz , more than 10 decibels beyond the current state of the art. Copyright Gibbons Media & Research LLC Numéro de notice : A2009-670 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33552
in Inside GNSS > vol 4 n° 6 (November - December 2009) . - 10 p. ; pp 52 - 61[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 159-09061 SL Revue Centre de documentation Revues en salle Disponible Documents numériques
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Coherent integration time ... - pdf éditeurAdobe Acrobat PDF The effects of navigation sensors and spatial road network data quality on the performance of map matching algorithms / M. Quddus in Geoinformatica, vol 13 n° 1 (March 2009)
[article]
Titre : The effects of navigation sensors and spatial road network data quality on the performance of map matching algorithms Type de document : Article/Communication Auteurs : M. Quddus, Auteur ; R. Noland, Auteur ; W. Ochieng, Auteur Année de publication : 2009 Article en page(s) : pp 85 - 108 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] appariement de cartes
[Termes IGN] cohérence des données
[Termes IGN] géonavigateur
[Termes IGN] GPS assisté pour la navigation (technologies)
[Termes IGN] milieu urbain
[Termes IGN] performance
[Termes IGN] phase GPS
[Termes IGN] récepteur GPS
[Termes IGN] réseau routierRésumé : (Auteur) Map matching algorithms are utilised to support the navigation module of advanced transport telematics systems. The objective of this paper is to develop a framework to quantify the effects of spatial road network data and navigation sensor data on the performance of map matching algorithms. Three map matching algorithms are tested with different spatial road network data (map scale 1:1,250; 1:2,500 and 1:50,000) and navigation sensor data (global positioning system (GPS) and GPS augmented with deduced reckoning) in order to quantify their performance. The algorithms are applied to different road networks of varying complexity. The performance of the algorithms is then assessed for a suburban road network using high precision positioning data obtained from GPS carrier phase observables. The results show that there are considerable effects of spatial road network data on the performance of map matching algorithms. For an urban road network, the results suggest that both the quality of spatial road network data and the type of navigation system affect the link identification performance of map matching algorithms. Copyright Springer Numéro de notice : A2009-006 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1007/s10707-007-0044-x En ligne : https://doi.org/10.1007/s10707-007-0044-x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29636
in Geoinformatica > vol 13 n° 1 (March 2009) . - pp 85 - 108[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 057-09011 RAB Revue Centre de documentation En réserve L003 Disponible PermalinkRadio technology in the fiels: get the best out of your radios / A. Kluft in Geoinformatics, vol 11 n° 7 (01/11/2008)PermalinkAGNSS [Assisted GNSS] standardisation: the path to success in location-based services / M. Monnerat in Inside GNSS, vol 3 n° 5 (July - August 2008)PermalinkA GNSS odometer: how far have we come? / Andreas Wieser in GPS world, vol 19 n° 4 (April 2008)PermalinkPlace-tagged podcasts with synchronized maps on mobile media players / M. Arikawa in Cartography and Geographic Information Science, vol 34 n° 4 (October 2007)PermalinkL'évolution de la navigation et de la cartographie routière, un exemple à suivre pour l'intérieur ? / P. Saint-Martin in XYZ, n° 112 (septembre - novembre 2007)PermalinkPoint to discover / René Simon in GEO: Geoconnexion international, vol 6 n° 5 (may 2007)Permalink3D dynamic emergency routing: directing vehicles in complex urban environments / Z. Qing in GIM international, vol 20 n° 6 (June 2006)PermalinkShaping euro navigation / T. Deloye in GEO: Geoconnexion international, vol 5 n° 5 (may 2006)PermalinkTo locate a phone or PDA: GNSS/UMTS prototype for mass-market applications / G. Heinrichs in GPS world, vol 17 n° 1 (January 2006)Permalink