Centre de documentation
scientifique

Map-aided GPS navigation: linking vehicles and maps to support location-based services / S. Syed in GPS world, vol 16 n° 11 (November 2005)

Public [article]  inGPS world > vol 16 n° 11 (November 2005) . - pp 39 - 44 Titre : Map-aided GPS navigation: linking vehicles and maps to support location-based services Type de document : Article/Communication Auteurs : S. Syed, Auteur ; E. Cannon, Auteur Année de publication : 2005 Article en page(s) : pp 39 - 44 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] carte routière [Termes IGN] géonavigateur [Termes IGN] GPS assisté pour la navigation (technologies) [Termes IGN] logique floue [Termes IGN] navigation à l'estime [Termes IGN] navigation automobile [Termes IGN] service fondé sur la position Résumé : (Editeur) Installed GPS navigation systems are becoming popular options for new car buyers. And many aftermarket, portable, and PDA- or cell phone-based systems are available in the marketplace. A basic GPS navigation system can provide continuous, accurate navigation, except when the GPS signals are blocked by buildings, tunnels, or other obstructions or when multipath or interference reduces position accuracy. A factory-installed system might include additional sensors such as an odometer or gyroscope to provide dead-reckoning navigation when GPS signals are lacking. Another aid to accurate navigation is map-matching in which the computed position fix is snapped onto the nearest road. However, depending on the fix error and the density of the road network, the system may or may not snap the fix onto the correct road. In this month's column, guest authors Syed and Cannon examine a novel technique that tightly integrates information from accurate maps with raw GPS and gyro data to determine a vehicle's position. Using classic statistical theory and fuzzy logic algorithms, the technique improved vehicle navigation accuracy in an urban canyon setting by more than 30 percent. Copyright Questex Media Group Inc Numéro de notice : A2005-581 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27716 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
067-05111	SL	Revue	Centre de documentation	Revues en salle	Disponible

Turn, turn, turn: wheel-speed dead reckoning for vehicle navigation / C. Hay in GPS world, vol 16 n° 10 (October 2005)

Public [article]  inGPS world > vol 16 n° 10 (October 2005) . - pp 37 - 42 Titre : Turn, turn, turn: wheel-speed dead reckoning for vehicle navigation Type de document : Article/Communication Auteurs : C. Hay, Auteur Année de publication : 2005 Article en page(s) : pp 37 - 42 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] direction [Termes IGN] GPS assisté pour la navigation (technologies) [Termes IGN] navigation à l'estime [Termes IGN] navigation automobile [Termes IGN] odomètre [Termes IGN] positionnement par GPS Résumé : (Editeur) "Let us now consider an invention by no means useless, and delivered to us by the ancients as of ingenuity, by means of which, when on a journey by land or sea, one may ascertain the distance travelled. It is as follows. The wheels of the chariot must be four feet diameter; so that, marking a cer-tain point thereon, whence it begins its revolution on the ground, when it has completed that revolution, it will have gone on the road over a space equal to twelve feet and a half." So begins the description by the Roman engineer Marcus Vitruvius Pollio of a distance-measuring device based on the rotation of a wheel. This device is the ancestor of the odometer and wheel-speed sensors present in virtually every vehicle on the road today. Both odometers and wheel-speed sensors can be used for dead-reckoning navigation - determin-ing a vehicle's position based on an initial position, the measured distance travelled in a given time interval, and the vehicle's heading. Compasses have traditionally supplied the heading information in a dead-reckoning navigation system. However, with wheel-speed sensors on each wheel, the system can determine not only the vehicle's speed but also its heading by differencing the measurements from the left and right wheels. In this month's column, we take a look at the use of wheel-speed sensors for in-vehicle navigation systems. Such systems can provide continuous navigation even when GPS signals are blocked by buildings, tunnels, and other obstructions. Copyright Questex Media Group Inc Numéro de notice : A2005-582 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27717 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
067-05101	SL	Revue	Centre de documentation	Revues en salle	Disponible

Prime time positioning: using broadcast TV signals to fill GPS acquisition gaps / M. Martone in GPS world, vol 16 n° 9 (September 2005)

Public [article]  inGPS world > vol 16 n° 9 (September 2005) . - pp 52 - 59 Titre : Prime time positioning: using broadcast TV signals to fill GPS acquisition gaps Type de document : Article/Communication Auteurs : M. Martone, Auteur ; J. Metzler, Auteur Année de publication : 2005 Article en page(s) : pp 52 - 59 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] GPS assisté pour la navigation (technologies) [Termes IGN] position directe [Termes IGN] positionnement par GPS [Termes IGN] signal analogique [Termes IGN] signal GPS [Termes IGN] signal numérique [Termes IGN] TELEVISION Résumé : (Editeur) Television. It features prominently in our living rooms and in our daily lives. It informs us, educates us, and entertains us. And now, thanks to a development at Rosum Corp. in Mountain View, California, TV will also position us. Researchers have devised a way to use terrestrial TV signals, both analog and digital, to determine positions. In a similar fashion to how GPS works, a special receiver can extract timing information from received TV signals to produce pseudo-ranges and, with additional transmitter clock offset information from a server, can determine the horizontal coordinates of the receiver. And since TV signals are quite strong, positions can be obtained inside buildings where conventional GPS and often assisted GPS does not work. In this month's column, we examine TV positioning. Authors from Rosum Corp. describe how the technique works, both standalone and in conjunction with GPS, discuss its advantages and limitations, and how the technique might provide added security for the global position, navigation, and timing infrastructure in these uncertain times. Copyright Questex Media Group Inc Numéro de notice : A2005-583 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27718 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
067-05091	SL	Revue	Centre de documentation	Revues en salle	Disponible

Continuous navigation: combining GPS with sensor-based dead reckoning / G.Z. Bronsen in GPS world, vol 16 n° 4 (April 2005)

Public [article]  inGPS world > vol 16 n° 4 (April 2005) . - pp 47 - 52 Titre : Continuous navigation: combining GPS with sensor-based dead reckoning Type de document : Article/Communication Auteurs : G.Z. Bronsen, Auteur ; D. Ammann, Auteur ; et al., Auteur Année de publication : 2005 Article en page(s) : pp 47 - 52 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes IGN] capteur (télédétection) [Termes IGN] étalonnage d'instrument [Termes IGN] géonavigateur [Termes IGN] GPS assisté pour la navigation (technologies) [Termes IGN] milieu urbain [Termes IGN] navigation à l'estime [Termes IGN] navigation automobile [Termes IGN] positionnement par GPS [Termes IGN] propagation du signal Résumé : (Editeur) "Can you hear me now? " This familiar question is asked countless times each day by mobile phone users attempting to improve their signal. Terrain, buildings, and foliage can block or seriously impede the propagation of cell-phone signal. Users of GPS receivers suffer the same problems. While there have been some advances in improving the sensitivity of GPS receivers and developing techniques such as assisted GPS that permit a GPS receiver to use attenuated signals, the antenna of a conventional receiver must have a direct line Of sight to the GPS satellites. In urban canyons, it may not be able to "see" a sufficient number of satellites with good geometry to determine a three-dimensional Position fix. And in tunnels or in parking garages, the receiver will see no satellites at all. Consequently, continuous navigation in many cities is impossible for conventional GPS-only navigation Systems. In this month's column, we look at how GPS can be combined with other sensors to provide continuous navigation in even the most-challenging environments. Copyright Questex Media Group Inc Numéro de notice : A2005-162 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27300 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
067-05041	SL	Revue	Centre de documentation	Revues en salle	Disponible

Position via Internet: SISNeT catches GPS in urban canyons / F. Toran in GPS world, vol 15 n° 4 (April 2004)

Public [article]  inGPS world > vol 15 n° 4 (April 2004) . - pp 28 - 35 Titre : Position via Internet: SISNeT catches GPS in urban canyons Type de document : Article/Communication Auteurs : F. Toran, Auteur ; J. Ventura, Auteur ; E. Gonzalez, Auteur ; et al., Auteur Année de publication : 2004 Article en page(s) : pp 28 - 35 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] European Geostationary Navigation Overlay Service [Termes IGN] géonavigateur [Termes IGN] GPS assisté pour la navigation (technologies) [Termes IGN] milieu urbain [Termes IGN] service fondé sur la position [Termes IGN] SISNeT [Termes IGN] télécommunication sans fil Résumé : (Auteur) Satellite-based augmentation systems (SBAS), like GPS, suffer visibility limitations in urban settings. A prototype receiver combines EGNOS correction messages received through a wireless Internet connection with pseudorange measurements from its internal GPS receiver, delivering a significant improvement in positioning accuracy and availability. Copyright Questex Media Group Inc Numéro de notice : A2004-598 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27114 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
067-04041	SL	Revue	Centre de documentation	Revues en salle	Disponible

GPS + INS + pseudolites: an integrated positioning system / Y. Yi in GPS world, vol 14 n° 7 (July 2003)

Permalink

GPS safety net GPS-Loran prototype processor / Lukas Roth in GPS world, vol 14 n° 5 (May 2003)

Permalink

In step with INS-navigation for the blind tracking emergency crews / Q. Ladetto in GPS world, vol 13 n° 10 (October 2002)

Permalink

Mapping Dilution of Precision (MDOP) and map-matched GPS / Geoffrey Blewitt in International journal of geographical information science IJGIS, vol 16 n° 1 (january 2002)  

Permalink

Leistungsfähigkeit fahrzeugautonomer Ortungsverfahren auf der Basis von Map-Matching-Techniken / R. Czommer (2001)

Permalink