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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)  

Public [article]  inGeoinformatica > vol 13 n° 1 (March 2009) . - pp 85 - 108 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 routier Résumé : (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 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
057-09011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

A-GPS / Franck Van Diggelen (2009)

Public Titre : A-GPS : assisted GPS, GNSS, and SBAS Type de document : Monographie Auteurs : Franck Van Diggelen, Auteur Editeur : Londres, Washington : Artech House Année de publication : 2009 Collection : GNSS Technology and applications series Importance : 380 p. Format : 18 x 26 cm ISBN/ISSN/EAN : 978-1-59693-374-3 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] affaiblissement de la précision [Termes IGN] éphémérides de satellite [Termes IGN] GNSS assisté pour la navigation [Termes IGN] GPS assisté pour la navigation (technologies) [Termes IGN] positionnement en intérieur [Termes IGN] positionnement par GPS [Termes IGN] récepteur GPS [Termes IGN] système d'extension [Termes IGN] traitement du signal Index. décimale : 30.61 Systèmes de Positionnement par Satellites du GNSS Résumé : (Editeur) Assisted GPS (A-GPS) has been developed to provide greatly improved capabilities, helping GPS work better and faster in almost any location. Offering a detailed look at all the technical aspects and underpinnings of A-GPS, this unique book places emphasis on practical implementation. The book reviews standard GPS design, helping you understand why GPS requires assistance in the first place. You discover how A-GPS enables the computing of a position from navigation satellites in the absence of precise time – a topic not covered in any other book. Moreover, you learn how to design and analyze a high sensitivity GPS receiver and determine the achievable sensitivity. The book provides detailed worksheets that show how to compute, analyze, and improve the processing gain from the input signal at the antenna to the signal after the correlators. These worksheets are used in the book to generate families of curves that completely characterize receiver sensitivity, parameterized in terms of front end noise figure, coherent and noncoherent integration times. From this work a law of achievable sensitivity is derived and explained in the book. This cutting-edge volume discusses special forms of assistance data, industry standards for A-GPS, and government mandates for location of mobile phones. You also find coverage of future global navigation satellite systems and how they can be designed specifically for instant-fixes and high sensitivity. The book features numerous tables, worksheets, and graphs that illustrate key topics and provide the equivalent of a technical handbook for engineers who design or use A-GPS. Note de contenu : 1- Introduction 2- Standard GPS Review 3- Assistance, the “A” in A-GPS 4- Coarse Time Navigation: “Instant GPS” 5- Coarse Time Dilution Of Precision 6- High Sensitivity: “Indoor GPS” 7- Generating Assistance Data 8- Ephemeris Extensions, Long Term Orbits 9- Industry Standards and Government Mandates 10- Future A-GNSS Numéro de notice : 20463 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Accessibilité hors numérique : Non accessible via le SUDOC Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63027

First AGPS - now BGPS: instantaneous precise positioning anywhere / I. Petrovski in GPS world, vol 19 n° 11 (November 2008)

Public [article]  inGPS world > vol 19 n° 11 (November 2008) . - pp 42 - 48 Titre : First AGPS - now BGPS: instantaneous precise positioning anywhere Type de document : Article/Communication Auteurs : I. Petrovski, Auteur ; H. Hojo, Auteur ; Toshiaki Tsujii, Auteur Année de publication : 2008 Article en page(s) : pp 42 - 48 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes IGN] GPS assisté pour la navigation (technologies) [Termes IGN] lever mobile [Termes IGN] positionnement cinématique en temps réel [Termes IGN] réseau géodésique [Termes IGN] signal GPS Résumé : (Editeur) Instant GPS positioning appears to be at hand. For better or worse, we live in fast communications, and fast cars, and have come to expect instant responses when we want something. [...] After switching on our receiver, we typically have to wait for some time before we can start navigating. This time to first fix (TTFF) depends on the quality of the received signals and the age of the receiver's stored almanac and ephemerides used to determine the positions of the satellites. It's also affected by how well the receiver knows the exact time. So there are several kinds of TTFF. If a receiver has no knowledge of its last position, doesn't know the approximate time, and has no almanac, it starts searching for signals blindly. This called a cold start. Depending on signal quality and design to the receiver, it can take anywhere from 60 seconds to 12 minutes or more before the receiver acquires signals, obtains ephemeris data, measures pseudoranges and gets its first position fix. If the receiver knows the approximate time as well as its approximate position and has a recent almanac but not a current ephemeris, it can produce a position fix within about 30 seconds or so after it is switched on - the time required to receive orbit and clock data from the tracked satellites. This is called a warm start. A hot start occurs when a receiver is powered on with a current ephemeris (received within the past four hours). It can take up to 6 seconds or more before the first fix as the receiver must typically acquire times marks from the satellite navigation messages to resolve the pseudorange ambiguities. Assisted GPS, or AGPS, can reduce TTFF by suplying current ephemeris data and accurate time over a mobile phone network. In some situations, TTFF can be reduced to just a second or two. However, the receiver does need to be connected to an AGPS network and so cannot operate autonomously. Enter BGPS. In this month's column we learn about an innovative approach that can produce accurate fist fixes within one second and without a network connection ? Copyright Questex Media Group Inc Numéro de notice : A2008-449 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29518 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
067-08111	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) 

Public [article]  inInside GNSS > vol 3 n° 5 (July - August 2008) . - 11 p. ; pp 22 - 33 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 position Résumé : (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 [article]

Documents numériques

peut être téléchargé AGNSS [Assisted GNSS] standardisation ... - pdf éditeur Adobe Acrobat PDF

A GNSS odometer: how far have we come? / Andreas Wieser in GPS world, vol 19 n° 4 (April 2008)

Public [article]  inGPS world > vol 19 n° 4 (April 2008) . - pp 50 - 55 Titre : A GNSS odometer: how far have we come? Type de document : Article/Communication Auteurs : Andreas Wieser, Auteur Année de publication : 2008 Article en page(s) : pp 50 - 55 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes IGN] écart type [Termes IGN] erreur systématique [Termes IGN] géonavigateur [Termes IGN] GPS assisté pour la navigation (technologies) [Termes IGN] Matlab [Termes IGN] odomètre [Termes IGN] positionnement par GNSS [Termes IGN] précision des mesures Résumé : (Editeur) [...] The odometer was likely first invented by Archimides during the First Punic War when Syracuse got in the way of Rome during its battle with Carthage. A Greek origin is fitting as the word odometer derives from the Greek words hodos, meaning "path" or "way" and matron, meaning "measure," The device was reinvented many times over the years but its use was not widespread until the development of the automobile, and now virtually every vehicle sports one. Mechanical odometers gave way to electronic ones but the distance travelled was and is still determined by counting wheel revolutions. But just how accurate are the odometers in our modern vehicles? Not very, it seems. The odometer reading is affected by tire pressure, tire slip, and incorrect calibration. And while in many countries there is no regulation covering odometer accuracy, the Society of Automotive Engineers' voluntary standard and that of the European Commission is only plus or minus 4 percent, or as much as a 4-kilometer error in every 100 km. Does this matter? Well, in effort to reduce the cost to the general tax payer of maintaining roads or reducing congestion, many administrations have implemented "road pricing," where a flat charge is levied for using a particular stretch of road or for entering a city center. But some administrations are charging per kilometer of travel with data coming from an odometer recording. Automobile insurance companies have also implemented plans where the premium is based on the distance travelled by the vehicle ("pay as you drive"). To fairly implement such schemes, governments should require more accurate odometers in vehicles. Could an odometer based on GNSS be a solution? In this month's column, we take a look at how distance travelled can be computed from GNSS observations and just how accurate those computations are. Copyright Questex Media Group Inc Numéro de notice : A2008-163 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29158 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
067-08041	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Utilities and communications / F. Weimann in GPS world, vol 18 n° 11 (November 2007)

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Augmentation of indoor positioning systems with a barometric pressure sensor for direct altitude determination in a multi-storey building / Guenther Retscher in Cartography and Geographic Information Science, vol 34 n° 4 (October 2007)  

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Wireless campus LBS: a test bed for WiFi positioning and location based services / B. Kobben in Cartography and Geographic Information Science, vol 34 n° 4 (October 2007)  

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Bringing all GNSS into line: new assistance standards embrace Galileo, Glonass, QZSS [Japanese quasi-zenith satellite system], SBAS [space-based augmentation system] / L. Wirola in GPS world, vol 18 n° 9 (September 2007)

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It's a robot life: using GPS and pseudolites for humanoid robot positioning / S. Sugano in GPS world, vol 18 n° 9 (September 2007)

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Opportunistic navigation: finding your way with AM signals of opportunity / J. Mcellroy in GPS world, vol 18 n° 7 (July 2007)

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Ubiquitous positioning: Anyone, anything, anytime, anywhere / X. Meng in GPS world, vol 18 n° 6 (June 2007)

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Photogrammetry for mobile mapping / Tarek Hassan in GPS world, vol 18 n° 3 (March 2007)

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GPS + LORAN-C: performance analysis of an integrated tracking system / J. Carroll in GPS world, vol 17 n° 7 (July 2006)

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Platoon, roll! Robots test sensor combos / S. Crawford in GPS world, vol 17 n° 6 (June 2006)

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