Descripteur
Documents disponibles dans cette catégorie (322)
Ajouter le résultat dans votre panier
Visionner les documents numériques
Affiner la recherche Interroger des sources externes
Etendre la recherche sur niveau(x) vers le bas
A new method for three-carrier GNSS ambiguity resolution / U. Fernandez-Plazaola in Journal of geodesy, vol 82 n° 4-5 (April - May 2008)
[article]
Titre : A new method for three-carrier GNSS ambiguity resolution Type de document : Article/Communication Auteurs : U. Fernandez-Plazaola, Auteur ; T. Martin-Guerrero, Auteur ; J. Entrambasaguas, Auteur Année de publication : 2008 Article en page(s) : pp 269 - 278 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal
[Termes IGN] factorisation de Cholesky
[Termes IGN] phase GPS
[Termes IGN] résolution d'ambiguïté
[Termes IGN] signal GNSSRésumé : (Auteur) A new method for resolving the carrier-phase integer ambiguity in Global Navigation Satellite Systems (GNSS) is presented: the MOdified Cholesky factorization for Ambiguity (MOCA) resolution. The characteristics and features of this method are described and results obtained using a software simulator and an emulator are presented to validate its efficiency. The results are then compared to those obtained using another existing method and good performance of the MOCA method in new GNSS systems is shown. Furthermore, the proposed method yields accurate results even when short time spans are used or when there are poor estimations of measurement error, making it immune to non-ideal conditions and ultimately a practical solution for real applications. Copyright Springer Numéro de notice : A2008-170 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-007-0177-6 En ligne : https://doi.org/10.1007/s00190-007-0177-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29165
in Journal of geodesy > vol 82 n° 4-5 (April - May 2008) . - pp 269 - 278[article]Réservation
Réserver ce documentExemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 266-08042 RAB Revue Centre de documentation En réserve L003 Disponible 266-08041 RAB Revue Centre de documentation En réserve L003 Disponible
[article]
Titre : GNSS indoors : fighting the fading, part 1 Type de document : Article/Communication Auteurs : Günter W. Hein, Auteur ; M. Paonni, Auteur ; V. Kropp, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : 10 p. ; pp 43 - 52 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] positionnement en intérieur
[Termes IGN] signal GNSS
[Termes IGN] traitement du signalRésumé : (Editeur) The ability to receive low-power GNSS signals inside buildings represents a veritable Holy Grail for product designers and manufacturers. Despite increases in receiver sensitivity and sophisticated signal-processing techniques, consistent and robust positioning indoors has not been achieved. In this first of a two-part exploration of the subject, the authors review existing models of indoor signal processing and the results of a new test designed to create an original model of satellite-navigation signal behavior as it propagates through diverse room shapes and building materials. Copyright Gibbons Media & Research LLC Numéro de notice : A2008-648 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33527
in Inside GNSS > vol 3 n° 2 (March 2008) . - 10 p. ; pp 43 - 52[article]Voir aussiDocuments numériques
peut être téléchargé
GNSS indoors ... - pdfAdobe Acrobat PDF Improving long-range RTK: getting a better handle on the biases / D. Kim in GPS world, vol 19 n° 3 (March 2008)
[article]
Titre : Improving long-range RTK: getting a better handle on the biases Type de document : Article/Communication Auteurs : D. Kim, Auteur ; R.B. Langley, Auteur Année de publication : 2008 Article en page(s) : pp 50 - 56 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal
[Termes IGN] correction atmosphérique
[Termes IGN] GPS en mode cinématique
[Termes IGN] phase GPS
[Termes IGN] positionnement cinématique en temps réel
[Termes IGN] propagation ionosphérique
[Termes IGN] propagation troposphérique
[Termes IGN] résolution d'ambiguïtéRésumé : (Editeur) Scientists and engineers continue to improve high-accuracy GPS positioning techniques - techniques pioneered a quarter of a century ago. The first GPS satellite, SVN01/PRN04, was launched from Cape Canaveral on February 22, 1978. And between 1978 and 1985, the U.S. Air Force orbited nine more prototype or Block I satellites to test key technologies before deploying the operational constellation. Surveyors and geodesists were among the earliest users of the Block I satellites. Using the satellite signals, they developed accurate positioning techniques based on the use of carrier-phase observations - about two orders of magnitude more precise than code measurements. To reduce the effect of biases and errors in the measurements, they developed the concepts of between-satellite and between-receiver single differencing of the carrier-phase data as well as double and triple differencing. Raw measurements were recorded by receivers and then post-processed to obtain receiver coordinates. Clever approaches were developed to handle the integer ambiguity of the carrier phases. With the launch of the Block II satellites beginning in 1989, further improvements in positioning accuracy and efficiency became possible, including real-time carrier-phase based positioning with a radio link between a reference receiver and a remote receiver. This technique became known as real-time kinematic or RTK, as it permitted the remote receiver to rove and occupy different points in a single positioning exercise. But carrier-phase ambiguity resolution issues coupled with inaccurately modeled satellite orbit and atmospheric effects has limited consistent single-baseline RTK operation between reference and rover receivers to tens of kilometers. On longer baselines, inaccurate modeling can result in significant positioning errors. Network RTK, using simultaneously operating reference stations to better determine error corrections, can extend the area of coverage of RTK but it, too, has limitations. In this month's column, I am joined by my colleague Don Kim who has developed an innovative approach to long-range RTK. We describe how accurate modeling of atmospheric effects coupled with an ionosphere-free ambiguity resolution process results in successful long-range RTK that can be implemented in either single-baseline or network mode. Has the ultimate RTK approach been developed? Probably not. But we're getting closer. Copyright Questex Media Group Inc Numéro de notice : A2008-162 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29157
in GPS world > vol 19 n° 3 (March 2008) . - pp 50 - 56[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 067-08031 RAB Revue Centre de documentation En réserve L003 Disponible GALILEO validation: the validation message / M. Tossaint in GPS world, vol 19 n° 2 (February 2008)
[article]
Titre : GALILEO validation: the validation message Type de document : Article/Communication Auteurs : M. Tossaint, Auteur ; S. Binda, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 30 - 36 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] constellation Galileo
[Termes IGN] GIOVE (satellite)
[Termes IGN] implémentation (informatique)
[Termes IGN] signal GalileoRésumé : (Auteur) The GIOVE-A satellite broadcast Galileo's first signals on January 12 2006. GIOVE-B is scheduled for launch on April 27 2008. The authors describe generation of the first Galileo navigation messages, operational and performance aspects, and signal improvements. Some improvements have been already identified, and their implementation is ongoing. Copyright Questex Media Group Inc Numéro de notice : A2008-050 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29045
in GPS world > vol 19 n° 2 (February 2008) . - pp 30 - 36[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 067-08021 RAB Revue Centre de documentation En réserve L003 Disponible Tsunami detection by GPS: how ionospheric observations might improve the global warning system / Giovanni Occhipinti in GPS world, vol 19 n° 2 (February 2008)
[article]
Titre : Tsunami detection by GPS: how ionospheric observations might improve the global warning system Type de document : Article/Communication Auteurs : Giovanni Occhipinti, Auteur ; A. Komjathy, Auteur ; P. Logonne, Auteur Année de publication : 2008 Article en page(s) : pp 50 - 56 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] ionosphère
[Termes IGN] prévention des risques
[Termes IGN] réseau géodésique permanent
[Termes IGN] risque naturel
[Termes IGN] séisme
[Termes IGN] signal GPS
[Termes IGN] surface de la mer
[Termes IGN] surveillance géologique
[Termes IGN] teneur totale en électrons
[Termes IGN] traitement de données GNSS
[Termes IGN] tsunamiRésumé : (Editeur) [...] recent investigations have demonstrated that GPS might be a very effective tool for improving the warning system. This can be done, for example, through rapid determination of earthquake magnitude using data from existing GPS networks. And, as incredible as it might seem, another approach is to use the GPS data to look for the tsunami signature in the ionosphere : the small displacement of the ocean surface displaces the atmosphere and makes it all the way to the ionosphere, causing measurable changes in ionospheric electron density. In this month's column, we look in detail at how a tsunami can affect the ionosphere and how GPS measurements of the effects might be used to improve the global tsunami warning system. Copyright Questex Media Group Inc Numéro de notice : A2008-051 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29046
in GPS world > vol 19 n° 2 (February 2008) . - pp 50 - 56[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 067-08021 RAB Revue Centre de documentation En réserve L003 Disponible Développement et validation d'une méthode de calcul GPS intégrant des mesures de profils de vapeur d'eau en visée multi-angulaire pour l'altimétrie de haute précision / Pierre Bosser (2008)PermalinkPermalinkMulti-dimensional B-spline modeling of spatio-temporal Ionospheric signals / C. Zeilhofer (2008)PermalinkPermalink3D modelling of the tropospheric refractivity using a permanent GPS network / D. Marcias-Valadez in Geomatica, vol 61 n° 4 (December 2007)PermalinkGateway to a successful start of Galileo: gate, Galileo test environment / S. Plum in Geoinformatics, vol 10 n° 8 (01/12/2007)PermalinkGeneration of a consistent absolute phase center correction model for GPS receiver and satellite antennas / Ralf Schmid in Journal of geodesy, vol 81 n° 12 (December 2007)PermalinkThe wavelet method as an alternative for reducing ionospheric effects from single-frequency GPS receivers / E.M. DE Souza in Journal of geodesy, vol 81 n° 12 (December 2007)PermalinkStudy of the statistics of water vapor mixing ratio determined from Raman lidar measurements / Pierre Bosser in Applied Optics, vol 46 n° 3 ([20/11/2007])PermalinkReflecting on GPS: sensing land and ice from low Earth orbit / S.T. Gleason in GPS world, vol 18 n° 10 (October 2008)PermalinkBrainy positioning: processing GPS data with neural networks / Rodrigo Figueiredo Leandro in GPS world, vol 18 n° 9 (September 2007)PermalinkLe positionnement en intérieur / Nel Samama in XYZ, n° 112 (septembre - novembre 2007)PermalinkEtude pour la réalisation de cartes de visibilité satellitaire GNSS / G. Bizouard in XYZ, n° 111 (juin - août 2007)PermalinkGalileo signal experimentation / M. Hollreiser in GPS world, vol 18 n° 5 (May 2007)PermalinkGPS sidereal filtering: coordinate- and carrier-phase-level strategies / A.E. Ragheb in Journal of geodesy, vol 81 n° 5 (May 2007)PermalinkHigher order ionospheric effects in precise GNSS positioning / M. Mainul Hoque in Journal of geodesy, vol 81 n° 4 (April 2007)PermalinkCalibration errors on experimental slant total electron content (TEC) determined with GPS / L. Ciraolo in Journal of geodesy, vol 81 n° 2 (February 2007)PermalinkEfficiency of carrier-phase integer ambiguity resolution for precise GPS positioning in noisy environments / L. Zhu in Journal of geodesy, vol 81 n° 2 (February 2007)PermalinkPermalinkWorkshop on satellite navigation user equipment technologies / Huibert-Jan Lekkerkerk in Geoinformatics, vol 10 n° 1 (01/01/2007)Permalink