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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)
[article]
Titre : Opportunistic navigation: finding your way with AM signals of opportunity Type de document : Article/Communication Auteurs : J. Mcellroy, Auteur ; J.F. Raquet, Auteur ; M.A. Temple, Auteur Année de publication : 2007 Article en page(s) : pp 44 - 49 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] GPS assisté pour la navigation (technologies)
[Termes IGN] modulation du signal
[Termes IGN] positionnement par GPSRésumé : (Auteur) In last month's column, we took a brief look at some of the technologies that might be used for UbiPos - ubiquitous positioning - to supplement conventional GPS in environments where it performs poorly or not at all such as in concrete canyons and inside buildings. One of the technologies mentioned involves using signals of opportunity radio signals whose primary purpose is for communications or broadcasting but which could be used for positioning and navigation. Potential signals of opportunity include the amplitude modulated (AM) broadcast stations in the medium wave band. Invented just over 100 years ago by the Canadian radio pioneer Reginald Fessenden, AM broadcasting covers large parts of the globe. Despite the recent tendency of AM stations to move to the FM band, most large metropolitan areas still boast a dozen or more stations on the "AM dial." The signals from AM stations can be used to determine the position of a mobile receiver with respect to a reference receiver using time difference of arrival (TDOA) measurements and a supplementary link between the two receivers. Measurements on one transmitter establish a hyperbolic line of position for the mobile receiver and the intersection of this line with another from measurements on a second transmitter establishes the receiver's position. Measurements on additional transmitters can improve the position accuracy and estimate unsynchronized receiver clock differences through a multi-lateration approach. It matters not whether the stations are "talk radio" or "country and western," as it is the carrier phase of the signals which provides the TDOA measurements. Of course, the proposed use of AM radio broadcasts for positioning and navigation is not a new idea. Measurements of the angle of arrival of AM broadcasts have long been used for position fixing in marine and other environments. In this month's column, a team of authors from the U.S. Air Force Institute of Technology describe the simulations and real-world experiments they carried out using a software-defined radio receiver to test the feasibility of AM radio TDOA measurements for positioning and navigation.Copyright Questex Media Group Inc Numéro de notice : A2007-148 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28511
in GPS world > vol 18 n° 7 (July 2007) . - pp 44 - 49[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-07071 RAB Revue Centre de documentation En réserve L003 Disponible Ubiquitous positioning: Anyone, anything, anytime, anywhere / X. Meng in GPS world, vol 18 n° 6 (June 2007)
[article]
Titre : Ubiquitous positioning: Anyone, anything, anytime, anywhere Type de document : Article/Communication Auteurs : X. Meng, Auteur ; A. Dodson, Auteur ; T. Moore, Auteur ; G. Roberts, Auteur Année de publication : 2007 Article en page(s) : pp 60 - 65 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] caméra numérique
[Termes IGN] GPS assisté pour la navigation (technologies)
[Termes IGN] GPS-INS
[Termes IGN] PDA
[Termes IGN] positionnement cinématique en temps réel
[Termes IGN] positionnement par GNSS
[Termes IGN] positionnement par GPS
[Termes IGN] récepteur GPS
[Termes IGN] téléphonie mobileRésumé : (Auteur) Mark Weiser is not exactly a household name. He was a chief technology officer at the Xerox Corporation's famous Palo Alto Research Center. This is the same outfit which brought us laser printing, Ethernet communications, the graphical user interface paradigm (including the mouse), and object-oriented programming. Like many of those who make a significant difference in technical fields, Mark Weiser's contributions are well known but his name is not. Dr. Weiser introduced the concept of "ubiquitous computing." He coined this term in 1988 to describe a new generation of the computer era, where the first two generations, that of the mainframe and the personal computer, would be superseded by one in which computers would disappear into the objects that surround us in our daily life both at the office and at home. He further posited that the best computer is a quiet, invisible servant whose "calm technology" informs us but doesn't demand our focus or attention. His idea, often tagged "UbiComp," has borne fruit and we now have smart coffee pots, smart printers, smart copy machines and the like, all connected via a wired or wireless network. Users of some of the smart devices in our UbiComp world, such as mobile telephones, personal digital assistants, cameras, and camcorders, would benefit by knowing their location wherever they might be - whether it's in an open field, on a street surrounded by skyscrapers, or inside an apartment building. As we all know, conventional GPS receivers don't always work where we would like them to. In order for a UbiComp device to know its position anywhere and anytime, we need "ubiquitous positioning" or UbiPos. And like UbiComp, UbiPos should inform us but not demand our focus or attention. In this month's column, we take a look at the available technologies that might be used to supplement conventional GPS positioning and some initial testing that will eventually lead to a UbiPos world, one in which we can locate anyone, anything, anytime, anywhere. Numéro de notice : A2007-249 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28612
in GPS world > vol 18 n° 6 (June 2007) . - pp 60 - 65[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-07061 RAB Revue Centre de documentation En réserve L003 Disponible Photogrammetry for mobile mapping / Tarek Hassan in GPS world, vol 18 n° 3 (March 2007)
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Titre : Photogrammetry for mobile mapping Type de document : Article/Communication Auteurs : Tarek Hassan, Auteur ; C. Ellum, Auteur ; et al., Auteur Année de publication : 2007 Article en page(s) : pp 44 - 48 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] coordonnées géographiques
[Termes IGN] dégradation du GPS
[Termes IGN] GPS assisté pour la navigation (technologies)
[Termes IGN] GPS-INS
[Termes IGN] milieu urbain
[Termes IGN] photogrammétrie numérique
[Termes IGN] positionnement par GPS
[Termes IGN] précision géométrique (imagerie)
[Termes IGN] qualité des donnéesRésumé : (Auteur) While photogrammetry is often used as a mapping tool on its own, GPS an aid the technique by supplying accurate coordinates for digital cameras. In turn, photogrammetry can come to the aid of a GPS/INS positioning system by bridging gaps in GPS/INS positions, which frequently occur in urban environments. Numéro de notice : A2007-071 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28436
in GPS world > vol 18 n° 3 (March 2007) . - pp 44 - 48[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-07031 RAB Revue Centre de documentation En réserve L003 Disponible Generalisation of geographic information / William A Mackaness (2007)
Titre : Generalisation of geographic information : Cartographic modelling and applications Type de document : Monographie Auteurs : William A Mackaness, Éditeur scientifique ; L. Tiina Sarjakoski, Éditeur scientifique ; Anne Ruas , Éditeur scientifique Mention d'édition : 1 Editeur : Amsterdam [Pays Bas] : Elsevier Année de publication : 2007 Importance : 370 p. Format : 17 x 25 cm ISBN/ISSN/EAN : 978-0-08-045374-3 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] généralisation cartographique automatisée
[Termes IGN] GPS assisté pour la navigation (technologies)
[Termes IGN] information cartographique
[Termes IGN] information géographique
[Termes IGN] représentation multiple
[Termes IGN] système d'information géographique
[Termes IGN] temps réel
[Vedettes matières IGN] GénéralisationRésumé : (Editeur) Users have come to expect instant access to up-to-date geographical information, with global coverage-presented at widely varying levels of detail, as digital and paper products; customisable data that can readily combined with other geographic information. These requirements present an immense challenge to those supporting the delivery of such services (National Mapping Agencies (NMA), Government Departments, and private business. Generalisation of Geographic Information : Cartographic Modelling and Applications provides detailed review of state of the art technologies associated with these challenges, including the most recent developments in cartometric analysis techniques able to support high levels of automation among multi scale derivation techniques.
The book illustrates the application of these ideas within existing and emerging technologies. In addition to providing a comprehensive theoretical underpinning, the book demonstrates how theoretical developments have translated into commercial systems deployed within NMAs.
The book explores relevance of open systems in support of collaborative research and open source web based map services.Note de contenu : Preface.
1. Understanding Geographic Space (W.A. Mackaness).
2. Conceptual Models of Generalisation and Multiple Representation (L.T. Sarjakoski).
3. A Synoptic View of Generalisation Operators (N. Regnauld, R.B. McMaster).
4. Modelling the Overall Process of Generalisation (L. Harrie, R.Weibel).
5. Evaluation in the Map Generalisation Process (W.A. Mackaness, A. Ruas).
6. Databases Requirements for Generalisation and Multiple Representations (S. Mustière, J. van Smaalen).
7. A Real-Time Generalisation and Map Adaptation Approach for Location-Based Services (T. Sarjokoski , L.T. Sarjokoski).
8. Experiments in building an open generalisation system (A. Edwardes, D. Burghardt, M. Neun).
9. A data warehouse strategy for on-demand multiscale mapping (E. Bernier, Y. Bédard).
10. Relevance of Generalisation to the Extraction and Communication of Wayfinding Information (M. Sester, B. Elias).
11. 3D Building Generalisation (L. Meng, A. Forberg).
12. Characterising space via pattern recognition techniques: Identifying patterns in road networks (F. Heinzle, K-H. Anders).
13. Generalisation of Geographical Networks (R. Thomson, R. Brooks).
14. A Prototype of Generalisation based on the Multi-Agent System Paradigm (A. Ruas, C. Duchêne).
15. Managing Generalisation Updates in IGN Map Production (F. Lecordix, C. Lemarié).
16. Automated generalisation in a map production environment – the KMS Experience (P. West- Nielsen, M. Meyer).
17. Observations and Research Challenges in Map Generalisation and Multiple Representation (W.A. Mackaness, A. Ruas, L.T. Sarjakoski).Numéro de notice : 21298 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=55735 Contient
- Observations and research challenges in map generalisation and multiple representation / William A Mackaness (01/01/2007)
- Managing generalisation updates in IGN map production / François Lecordix (01/01/2007)
- A prototype generalisation system based on the multi-agent system paradigm / Cécile Duchêne (01/01/2007)
- Database requirements for generalisation and multiple representations / Sébastien Mustière (01/01/2007)
- Evaluation in the map generalisation process / William A Mackaness (01/01/2007)
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Code-barres Cote Support Localisation Section Disponibilité 21298-01 37.10 Livre Centre de documentation Géomatique Disponible 21298-02 DEP-TRS Livre LASTIG Dépôt en unité Exclu du prêt 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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Titre : GPS + LORAN-C: performance analysis of an integrated tracking system Type de document : Article/Communication Auteurs : J. Carroll, Auteur Année de publication : 2006 Article en page(s) : pp 40 - 47 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] GPS assisté pour la navigation (technologies)
[Termes IGN] intégration de données
[Termes IGN] LORAN (système)
[Termes IGN] navigation à l'estime
[Termes IGN] performance
[Termes IGN] positionnement par GPS
[Termes IGN] récepteurRésumé : (Editeur) Before GPS, even before satellites, there was LOng RAnge Navigation, or LORAN. Using terrestrial radio transmitters, it was developed during World War II for aircraft navigation. The wartime system evolved by the mid-1950s into the present day 100 kHz LORAN-C system. LORAN's standard principle of op-eration is hyperbolic positioning. A receiver measures the difference in times of arrival of pulses transmitted by a chain of three to six synchronized stations sep--arated by hundreds of kilometers. The time-difference measurement derived from the signals of two stations, when multiplied by the speed of propagation of the signals, forms a line of position (LOP); the receiver could be anywhere on this line and give the same measurement. The geometrical form of this LOP is a hyperbola. Measurements using a third station provide an-other hyperbola, which intersects the first at the position of the receiver. There are many LORAN chains around the globe.
The LORAN system is being modernized to enhance its accuracy, integrity, availability, and continuity. Vacuum-tube transmitters are being replaced with solid-state designs and new primary frequency standards are being installed at transmitting stations. Manufacturers have developed compact LORAN receivers able to track multiple transmitters simultaneously and to automatically apply propagation bias corrections. Some receivers are integrated with GPS or other sensors. Receivers also feature improved antenna designs. Collectively, these improvements are known as Enhanced LORAN or eLORAN for short. Additionally, LORAN signals can be used to convey differential GPS corrections. Such a system is already operational in Europe. Supported by the Coast Guard and the Federal Aviation Administration in the United States, a goal of eLORAN is to provide non-precision approach for aviation users and harbor entrance and approach for marine users. Land users will benefit, too. Since LORAN has different signal characteristics from those of GPS, it can be used in locations where GPS cannot by itself or in conjunction with GPS and other sensors. In this month's column, we look at a system that combines eLORAN with GPS and dead reckoning to overcome some of the problems in navigating in big cities. Copyright Questex Media Group IncNuméro de notice : A2006-567 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28290
in GPS world > vol 17 n° 7 (July 2006) . - pp 40 - 47[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-06071 RAB Revue Centre de documentation En réserve L003 Disponible Platoon, roll! Robots test sensor combos / S. Crawford in GPS world, vol 17 n° 6 (June 2006)PermalinkMap-aided GPS navigation: linking vehicles and maps to support location-based services / S. Syed in GPS world, vol 16 n° 11 (November 2005)PermalinkTurn, turn, turn: wheel-speed dead reckoning for vehicle navigation / C. Hay in GPS world, vol 16 n° 10 (October 2005)PermalinkPrime time positioning: using broadcast TV signals to fill GPS acquisition gaps / M. Martone in GPS world, vol 16 n° 9 (September 2005)PermalinkContinuous navigation: combining GPS with sensor-based dead reckoning / G.Z. Bronsen in GPS world, vol 16 n° 4 (April 2005)PermalinkPosition via Internet: SISNeT catches GPS in urban canyons / F. Toran in GPS world, vol 15 n° 4 (April 2004)PermalinkGPS + INS + pseudolites: an integrated positioning system / Y. Yi in GPS world, vol 14 n° 7 (July 2003)PermalinkGPS safety net GPS-Loran prototype processor / Lukas Roth in GPS world, vol 14 n° 5 (May 2003)PermalinkIn step with INS-navigation for the blind tracking emergency crews / Q. Ladetto in GPS world, vol 13 n° 10 (October 2002)PermalinkMapping Dilution of Precision (MDOP) and map-matched GPS / Geoffrey Blewitt in International journal of geographical information science IJGIS, vol 16 n° 1 (january 2002)PermalinkLeistungsfähigkeit fahrzeugautonomer Ortungsverfahren auf der Basis von Map-Matching-Techniken / R. Czommer (2001)Permalink