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In step with INS-navigation for the blind tracking emergency crews / Q. Ladetto in GPS world, vol 13 n° 10 (October 2002)
[article]
Titre : In step with INS-navigation for the blind tracking emergency crews Type de document : Article/Communication Auteurs : Q. Ladetto, Auteur ; Bertrand Merminod, Auteur Année de publication : 2002 Article en page(s) : pp 30 - 38 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] baromètre anéroïde
[Termes IGN] géonavigateur
[Termes IGN] GPS assisté pour la navigation (technologies)
[Termes IGN] GPS-INS
[Termes IGN] navigation pédestre
[Termes IGN] personne non-voyante
[Termes IGN] positionnement en intérieur
[Termes IGN] secours d'urgenceRésumé : (Auteur) Integrating a GPS reveiver with an inertial measurement unit, a barometer, and step-length algorithms, Swiss researchers have extended pedestrian navigation to urban canyons and indoors. The module applies pattern recognition to accelerometer signals, determining a user's step "signature". This can aid blind people in reaching unfamiliar locations and enable emergency coordinators to track rescue workers through chaotic conditions. Numéro de notice : A2002-249 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22160
in GPS world > vol 13 n° 10 (October 2002) . - pp 30 - 38[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-02101 RAB Revue Centre de documentation En réserve L003 Disponible 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)
[article]
Titre : Mapping Dilution of Precision (MDOP) and map-matched GPS Type de document : Article/Communication Auteurs : Geoffrey Blewitt, Auteur ; Georges E. Taylor, Auteur Année de publication : 2002 Article en page(s) : pp 55 - 67 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] affaiblissement géométrique de la précision
[Termes IGN] appariement de cartes
[Termes IGN] correction
[Termes IGN] erreur de positionnement
[Termes IGN] GPS assisté pour la navigation (technologies)
[Termes IGN] GPS en mode différentiel
[Termes IGN] méthode des moindres carrés
[Termes IGN] navigation automobile
[Termes IGN] positionnement différentiel
[Termes IGN] véhicule automobileRésumé : (Auteur) A novel method of map matching using the Global Positioning System (GPS) has been developed which uses digital mapping and height data to augment point position computation. This method reduces the error in position, which is a sum from several sources, including signal delay due to the ionosphere and atmosphere and until recently from 'selective availability' (S/A). S/A was imposed by the US military to degrade purposefully the accuracy of GPS, but was switched off on 2 May 2000, and is to be replaced with 'regional denial capabilities in lieu of global degradation' (Interagency GPS Executive Board, 2000). Taylor et al. (2001) describe the Road Reduction Filter (RRF) in detail. RRF is a method of detecting the correct road on which a vehicle is travelling. In the work described here, the position error vector is estimated in a formal least squares procedure, as the vehicle is moving. This estimate is a map-matched correction, that provides an autonomous alternative to DGPS for in-car navigation and fleet management. In this paper, a formula is derived for 'Mapped Dilution of Precision' (MDOP), defined as the theoretical ratio of position precision using map-matched corrections to that using perfect Differential GPS (DGPS) correction. This is shown to be purely a function of route geometry, and is computed for examples of basic road shapes. MDOP is favourable unless the route has less than a few degrees curvature for several kilometres. MDOP can thus provide an objective estimate of positioning precision to a vehicle driver. Precision estimates using MDOP are shown to agree well with 'true' positioning errors determined using high precision (cm) GPS carrier phase techniques. The exact location of a vehicle on a road is essential for accurate surveying applications. These include close range photogrammetry using digital video or still cameras and the verification of digital mapping by measured (GPS and other sensors) trajectories. Numéro de notice : A2002-004 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1080/13658810110075996 En ligne : https://doi.org/10.1080/13658810110075996 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21921
in International journal of geographical information science IJGIS > vol 16 n° 1 (january 2002) . - pp 55 - 67[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-02011 RAB Revue Centre de documentation En réserve L003 Disponible Interoperability in GNSS systems: a level-by-level definition / L. Dutton in Galileo's world, vol 3 n° 3 (01/09/2001)
[article]
Titre : Interoperability in GNSS systems: a level-by-level definition Type de document : Article/Communication Auteurs : L. Dutton, Auteur ; A. Turner, Auteur Année de publication : 2001 Article en page(s) : pp 17 - 19 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] European Geostationary Navigation Overlay Service
[Termes IGN] Galileo
[Termes IGN] Global Navigation Satellite System
[Termes IGN] Global Orbitography Navigation Satellite System
[Termes IGN] Global Positioning System
[Termes IGN] interopérabilité
[Termes IGN] navigation automobileRésumé : (Auteur) Interoperability means different things to different people, and to different organisations. Further, each level of a GNSS, from the receiver to the navigation / communication system to the concept of use, presents different interoperability opportunities and requirements. Numéro de notice : A2001-192 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21886
in Galileo's world > vol 3 n° 3 (01/09/2001) . - pp 17 - 19[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15354-01 30.61 Revue Centre de documentation Géodésie Disponible Le GPS : Utilisation en positionnement et surveillance / Michel Kasser (2001)
Titre : Le GPS : Utilisation en positionnement et surveillance Type de document : Chapitre/Contribution Auteurs : Michel Kasser , Auteur Editeur : Paris : Techniques de l'Ingénieur Année de publication : 2001 Collection : Techniques de l'ingénieur Sous-collection : Mesures et contrôle Importance : 8 p. Format : 24 x 30 cm Note générale : Bibliographie
in Techniques de l'ingénieurLangues : Français (fre) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] European Geostationary Navigation Overlay Service
[Termes IGN] Galileo
[Termes IGN] Global Positioning System
[Termes IGN] surveillance d'ouvrage
[Termes IGN] système de référence géodésiqueIndex. décimale : 30.61 Systèmes de Positionnement par Satellites du GNSS Résumé : (Documentaliste) Présentation du Global Positioning System GPS comme moyen de positionnement réellement opérationnel depuis 1991, utilisable par le grand public comme par les techniciens dans divers domaines. Numéro de notice : 66724 Affiliation des auteurs : IGN (1940-2011) Thématique : POSITIONNEMENT Nature : Chapître / contribution Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64076 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 66724-01 30.61 Tiré à part Centre de documentation Géodésie Disponible Leistungsfähigkeit fahrzeugautonomer Ortungsverfahren auf der Basis von Map-Matching-Techniken / R. Czommer (2001)
Titre : Leistungsfähigkeit fahrzeugautonomer Ortungsverfahren auf der Basis von Map-Matching-Techniken Titre original : [Capacité de réalisation de procédé de détection d'un véhicule autonome sur la base des techniques de "map-matching"] Type de document : Thèse/HDR Auteurs : R. Czommer, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2001 Collection : DGK - C Sous-collection : Dissertationen num. 535 Importance : 145 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9574-8 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] correction
[Termes IGN] erreur systématique
[Termes IGN] géonavigateur
[Termes IGN] GPS assisté pour la navigation (technologies)
[Termes IGN] GPS en mode différentiel
[Termes IGN] milieu urbain
[Termes IGN] navigation automobile
[Termes IGN] odomètre
[Termes IGN] qualité des données
[Termes IGN] véhicule automobileIndex. décimale : 30.70 Navigation et positionnement Résumé : (Auteur) Autonomous car navigation systems with on-board positioning sensors and CD-road network require a road accurate positioning relatively to the road network for optimal route planning, for route guidance and for generating driving recommendations. Positioning effected in a certain reference system and its accuracy are not decisive but represent the logical location of the vehicle relatively to the digital map. This task is called map matching.
Modern car navigation systems use for positioning multi-sensor-systems (differential odometers, gyros, magnetic field sensors) in combination with GPS or DGPS. Little availability of satellite methods due to masking and second way effects in urban areas (85% of mobility activities in road traffic occur in urban areas), magnetic disturbances, wheel slips and unfavourable error propagation of dead reckoning lead again and again to loss of position and in principle to total system failures. This can be avoided by map matching which compensates the sensor typical error behaviour of positioning sensors. The systematic error behaviour was examined theoretically for the positioning sensors odometer (wheel sensors, i.e. ABS-sensors), magnetic field sensors, gyros, accelerometers, GPS, and DGPS. Based on these error models five map matching methods with different degrees of freedom were developed, estimated correspondingly to the various ways of presentation of plain curves in curvature pattern, in angular pattern, or with two-dimensional cartesian coordinates.
For orientation or curvature map matching the distance frives (ruve length) and the values of orientation (direction angle or curvatures) are derived from these measurements. This measured function over the curve length is fitted to the corresponding function of the map by estimating one offset and one scale factor in a least square adjustment between the two functions and the two curve lengths.
In case of coordinate procedures the driven distance is divided into line elements of constant length and compared with the line elements of the digital map. For matching onto the digital road network, three approximating transformation translations, plain similarity transformation and affinity transformation are studied. The sensivity of these five methods concerning systematic sensor errors is examined by a precise analysis by means of simulated observations for the sensor systems gyro with odometer and gyro with accelerometers.
Scale factors and bias of gyros can be compensated by curvature matching without any calibration of these errors. Accelerometer errors gradually lead to squared increasing errors regarding the measured distance, and cannot be matched without error compensation to any method on the map.
Based on real observations with GPS, DGPS, wheel sensors, and a strap down inertial system being investigated during test trips under normal traffic conditions the map matching procedures could be tested for various combinations of these sensors. The accuracies reached and the reliability of track identification of the exact track out of various alternative tracks being especially important for vehicle navigation, were analysed and valued.
In urban areas pure GPS measurements are often useless, as every change in satellite constellations leads to disturbances of the vehicle position which cannot be compensated by one of the methods.
DGPS needs a support by wheel sensors to bridge masking effects and to moderate drift effects during extremely slow motion. Measurements by sensor combinations such as gyro with wheel sensors, differential odometer, GPS with differential odometer, DGPS with differential odometer and pure DGPS (without long masking times) can be matched onto the map with all methods (besides translation), if at least two turns are contained within the data material.
The precision of the map matching process to the coordinate pattern decreases with growing distance. The orientation and curvature matching compensate systematic sensor errors considerably better and increase accuracy with growing distance.
The limits of positioning systems and map matching techniques are shown in problematic cases such as masking of the satellite signals, little curving of the track, track identification in nearly parallel alternative tracks.
Autonomous navigation systems based on odometers and gyros reach, by map matching onto the road net, more favourable positioning results at an accuracy of 70cm than pure DGPS measurements so that in urban areas a reliable map matching without DGPS is possible. The integration of DGPS does not show a considerable increase in accuracy, nevertheless the integrity of hybrid systems is increased.Numéro de notice : 68943 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62060 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 68943-01 30.70 Livre Centre de documentation Géodésie Disponible 68943-02 30.70 Livre Centre de documentation Géodésie Disponible PermalinkCompte-rendu de réunion "Civil GPS Service Interface Committee (CGSIC)", Kansas City, USA, 14-15 septembre 1997 / Pascal Willis (1997)PermalinkCompte-rendu de réunion du groupe de travail permanent du CNIG "Positionnement statique et dynamique", LRBA, Vernon, 5 juin 1997 / Pascal Willis (1997)Permalink