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Safety at the wheel: improving KGPS/INS performance and reliability / J. Wang in GPS world, vol 14 n° 5 (May 2003)

Public [article]  inGPS world > vol 14 n° 5 (May 2003) . - pp 16 - 26 Titre : Safety at the wheel: improving KGPS/INS performance and reliability Type de document : Article/Communication Auteurs : J. Wang, Auteur ; C. Wilson, Auteur Année de publication : 2003 Article en page(s) : pp 16 - 26 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] GPS en mode cinématique [Termes IGN] GPS-INS [Termes IGN] précision décimétrique [Termes IGN] véhicule automobile Résumé : (Editeur) Oncoming automobile capabilities such as lane-departure warnings and collision avoidance require real-time positioning accuracy of 10 centimeters or less. A new system integrating kinematic GPS, inertial measurement, wheel-speed data, and a digital map shows promise for this life-saving feature. Numéro de notice : A2003-420 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26500 [article]

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067-03051	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Monitoring the ionosphere with GPS: space weather / Anthea Coster in GPS world, vol 14 n° 5 (May 2003)

Public [article]  inGPS world > vol 14 n° 5 (May 2003) . - pp 42 - 49 Titre : Monitoring the ionosphere with GPS: space weather Type de document : Article/Communication Auteurs : Anthea Coster, Auteur ; J. Foster, Auteur ; P. Erickson, Auteur Année de publication : 2003 Article en page(s) : pp 42 - 49 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] données GPS [Termes IGN] ionosphère [Termes IGN] magnétosphère [Termes IGN] rayonnement ultraviolet [Termes IGN] surveillance météorologique [Termes IGN] tempête [Termes IGN] teneur totale en électrons Résumé : (Auteur) Here on Earth, high winds, heavy rains, deep snow, and other forms of severe weather can disrupt our daily lives. Conditions on the Sun and in the solar wind, magnetosphere, and the ionosphere can also affect our lives through the effects they have on satellites, communications, navigation, and power systems. Scientists are now studying space weather with a wide range of tools to try to learn more about the physical and chemical processes taking place in the upper atmosphere and beyond. One of these tools is GPS. The signals from the GPS satellites travel through the ionosphere on their way to receivers on or near Earth's surface. The free electrons populating this region of the atmosphere affect the propagation of the signals, changing their speed and direction of travel. By processing the data from a dual-frequency GPS receiver, it's actually possible to estimate just how many electrons were encountered by the signal along its travel path - the total electron content (TEC). TEC is the number of electrons in a column with a cross-sectional area of one square meter centered on the signal path. If a regional network of ground-based GPS receivers is used, then a map of TEC above the region can be constructed. The TEC normally varies smoothly from day to night as Earth's dayside atmosphere is ionized by the Sun's extreme ultraviolet radiation, while the nightside ionosphere electron content is reduced by chemical recombination. But the ionosphere can experience stormy weather just as the lower atmosphere does. Smooth variations in TEC are replaced by rapid fluctuations, and some regions experience significantly higher or lower TEC values than normal. In this month's column, we look at how GPS is being used to study such storms and how it is furthering our understanding of the Earth-Sun environment. Numéro de notice : A2003-421 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26501 [article]

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

Public [article]  inGPS world > vol 14 n° 5 (May 2003) . - pp 36 - 40 Titre : GPS safety net GPS-Loran prototype processor Type de document : Article/Communication Auteurs : Lukas Roth, Auteur ; et al., Auteur Année de publication : 2003 Article en page(s) : pp 36 - 40 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] positionnement par GPS [Termes IGN] prototype Résumé : (Auteur) A prototype GPS-Loran integration processor generates GPS-only, Loran-only, and combined GPS-Loran solutions. Developed for Federal Aviation Administration testing in an effort to support and complement GPS in multimodal applications, it also features a fault-detection and exclusion algorithm to incorporate Loran data and identify Loran faults. Copyright Questex Media Group Inc Numéro de notice : A2003-438 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26517 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
067-03051	RAB	Revue	Centre de documentation	En réserve L003	Disponible