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GLONASS modernization / Y. Urlichich in GPS world, vol 22 n° 11 (November 2011)
[article]
Titre : GLONASS modernization Type de document : Article/Communication Auteurs : Y. Urlichich, Auteur ; V. Subbotin, Auteur ; et al., Auteur Année de publication : 2011 Article en page(s) : pp 34 - 39 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] constellation GLONASS
[Termes IGN] Global Navigation Satellite System
[Termes IGN] signal GLONASSRésumé : (Auteur) The GLONASS-K satellite, transmitting a CDMA signal in the L3 band, inaugurates a new era of radionavigation signals for both the Russian system and for international GNSS interoperability. As demand for high-precision services through duel- or triple-frequency user equipment increases, GLONASS will come to the forefront. The 2014 GLONASS-K2 satellite will have an FDMA signal in the L1 and L2 and L3. The overall constellation update will be completed in 2021. Another 2014 launch will fill the Russian SBAS orbit constellation with three geostationary space vehicles. Numéro de notice : A2011-439 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31217
in GPS world > vol 22 n° 11 (November 2011) . - pp 34 - 39[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-2011111 RAB Revue Centre de documentation En réserve L003 Disponible High-precision GNSS receivers / N. Blanco-Delgado in GIM international, vol 25 n° 11 (November 2011)
[article]
Titre : High-precision GNSS receivers Type de document : Article/Communication Auteurs : N. Blanco-Delgado, Auteur Année de publication : 2011 Article en page(s) : pp 19 - 25 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] interférence
[Termes IGN] perturbation ionosphérique
[Termes IGN] positionnement par GNSS
[Termes IGN] qualité des données
[Termes IGN] récepteur GNSS
[Termes IGN] signal GNSS
[Termes IGN] vent solaireRésumé : (Auteur) What will the new GNSS signals bring to the user of high-precision receivers? This article provides a brief overview of what users can expect from GNSS systems that are currently in the modernisation/development stage, looking at new signals and emerging techniques including coverage of GNSS developments such as GPS, Galileo, GLONASS and Compass/Beidou. In view of the planned timeframe, what we can do to improve the robustness of our receivers with a special focus on interference and the upcoming solar maximum? Numéro de notice : A2011-415 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31194
in GIM international > vol 25 n° 11 (November 2011) . - pp 19 - 25[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 061-2011111 RAB Revue Centre de documentation Revues en salle Disponible Space-time equalization techniques for new GNSS signals / P. Anantharamu in GPS world, vol 22 n° 10 (October 2011)
[article]
Titre : Space-time equalization techniques for new GNSS signals Type de document : Article/Communication Auteurs : P. Anantharamu, Auteur ; Daniele Borio, Auteur ; Gérard Lachapelle, Auteur Année de publication : 2011 Article en page(s) : pp 36 - 41 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal
[Termes IGN] antenne GNSS
[Termes IGN] données spatiotemporelles
[Termes IGN] signal GNSS
[Termes IGN] traitement du signalRésumé : (Auteur) Spatial and temporal information of signals received from multiple antennas can be applied to mitigate the impact of new GPS and Galileo signal's binary-offset sub-carrier, reducing multipath and interference effects. Numéro de notice : A2011-419 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31198
in GPS world > vol 22 n° 10 (October 2011) . - pp 36 - 41[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-2011101 RAB Revue Centre de documentation En réserve L003 Disponible Interpolating atmospheric water vapor delay by incorporating terrain elevation information / B. Xu in Journal of geodesy, vol 85 n° 9 (September 2011)
[article]
Titre : Interpolating atmospheric water vapor delay by incorporating terrain elevation information Type de document : Article/Communication Auteurs : B. Xu, Auteur ; Z.W. Li, Auteur ; Jianjun Zhu, Auteur Année de publication : 2011 Article en page(s) : pp 555 - 564 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal
[Termes IGN] dégradation du signal
[Termes IGN] écho radar
[Termes IGN] interféromètrie par radar à antenne synthétique
[Termes IGN] interpolation spatiale
[Termes IGN] modèle numérique de surface
[Termes IGN] propagation du signal
[Termes IGN] signal GPS
[Termes IGN] vapeur d'eauRésumé : (Auteur) In radio signal-based observing systems, such as Global Positioning System (GPS) and Interferometric Synthetic Aperture Radar (InSAR), the water vapor in the atmosphere will cause delays during the signal transmission. Such delays vary significantly with terrain elevation. In the case when atmospheric delays are to be eliminated from the measured raw signals, spatial interpolators may be needed. By taking advantage of available terrain elevation information during spatial interpolation process, the accuracy of the atmospheric delay mapping can be considerably improved. This paper first reviews three elevation-dependent water vapor interpolation models, i.e., the Best Linear Unbiased Estimator in combination with the water vapor Height Scaling Model (BLUE + HSM), the Best Linear Unbiased Estimator coupled with the Elevation-dependent Covariance Model (BLUE + ECM), and the Simple Kriging with varying local means based on the Baby semi-empirical model (SKlm + Baby for short). A revision to the SKlm + Baby model is then presented, where the Onn water vapor delay model is adopted to substitute the inaccurate Baby semi-empirical model (SKlm + Onn for short). Experiments with the zenith wet delays obtained through the GPS observations from the Southern California Integrated GPS Network (SCIGN) demonstrate that the SKlm + Onn model outperforms the other three. The RMS of SKlm + Onn is only 0.55 cm, while those of BLUE + HSM, BLUE + ECM and SKlm + Baby amount to 1.11, 1.49 and 0.77 cm, respectively. The proposed SKlm + Onn model therefore represents an improvement of 29–63% over the other known models. Numéro de notice : A2011-374 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-011-0456-0 Date de publication en ligne : 08/03/2011 En ligne : https://doi.org/10.1007/s00190-011-0456-0 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31153
in Journal of geodesy > vol 85 n° 9 (September 2011) . - pp 555 - 564[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2011091 RAB Revue Centre de documentation En réserve L003 Disponible 4D GPS water vapor tomography: new parameterized approaches / Donat Perler in Journal of geodesy, vol 85 n° 8 (August 2011)
[article]
Titre : 4D GPS water vapor tomography: new parameterized approaches Type de document : Article/Communication Auteurs : Donat Perler, Auteur ; Alain Geiger, Auteur ; Fabian Peter Hurter, Auteur Année de publication : 2011 Article en page(s) : pp 539 - 550 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] Alpes
[Termes IGN] coordonnées ellipsoïdales
[Termes IGN] distribution spatiale
[Termes IGN] données GPS
[Termes IGN] données météorologiques
[Termes IGN] filtre de Kalman
[Termes IGN] prédiction
[Termes IGN] réfraction atmosphérique
[Termes IGN] réfringence
[Termes IGN] signal GPS
[Termes IGN] Suisse
[Termes IGN] tomographie
[Termes IGN] troposphère
[Termes IGN] vapeur d'eau
[Termes IGN] voxelRésumé : (Auteur) Water vapor is a key variable in numerical weather prediction, as it plays an important role in atmospheric processes. Nonetheless, the distribution of water vapor in the atmosphere is observed with a coarse resolution in time and space compared to the resolution of numerical weather models. GPS water vapor tomography is one of the promising methods to improve the resolution of water vapor measurements. This paper presents new parameterized approaches for the determination of water vapor distribution in the troposphere by GPS. We present the methods and give first results validating the approaches. The parameterization of voxels (volumetric pixels) by trilinear and spline functions in ellipsoidal coordinates are introduced in this study. The evolution in time of the refractivity field is modeled by a Kalman filter with a temporal resolution of 30s, which corresponds to the available GPS-data rate. The algorithms are tested with simulated and with real data from more than 40 permanent GPS receiver stations in Switzerland and adjoining regions covering alpine areas. The investigations show the potential of the new parameterized approaches to yield superior results compared to the non parametric classical one. The accuracy of the tomographic result is quantified by the inter-quartile range (IQR), which is decreased by 10–20% with the new approaches. Further, parameterized voxel solutions have a substantially smaller maximal error than the non parameterized ones. Simulations show a limited ability to resolve vertical structures above the top station of the network with GPS tomography. Numéro de notice : A2011-359 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-011-0454-2 Date de publication en ligne : 08/03/2011 En ligne : https://doi.org/10.1007/s00190-011-0454-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31138
in Journal of geodesy > vol 85 n° 8 (August 2011) . - pp 539 - 550[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2011081 RAB Revue Centre de documentation En réserve L003 Disponible Broadband versus GPS / Huibert-Jan Lekkerkerk in Geoinformatics, vol 14 n° 5 (01/07/2011)PermalinkMultipath minimization method: mitigation through adaptive filtering for machine automation applications / L. Serrano in GPS world, vol 22 n° 7 (July 2011)PermalinkMBOC signal options: performance of multiplexed binary offset carrier modulations for modernized GNSS systems / E. Lohan in GPS world, vol 22 n° 6 (June 2011)PermalinkKeeping the spoofs out: signal authentication services for future GNSS / Oscar Pozzobon in Inside GNSS, vol 6 n° 3 (May - June 2011)PermalinkGLONASS: developping strategies for the future / Y. Urlichich in GPS world, vol 22 n° 4 (April 2011)PermalinkCoherent integration time limits for mobile GNSS receivers in multipath fading environments / Ali Broumandan in Inside GNSS, vol 6 n° 2 (March - April 2011)PermalinkEGNOS gets to work / F. Boullete in GPS world, vol 22 n° 2 (February 2011)PermalinkEvaluation of the impact of atmospheric pressure loading modeling on GNSS data analysis / Rolf Dach in Journal of geodesy, vol 85 n° 2 (February 2011)PermalinkGNSS and the Ionosphere: What's in Store for the Next Solar Maximum? / A. Jensen in GPS world, vol 22 n° 2 (February 2011)PermalinkHarmonisation des séries temporelles : Application en climatologie / Anonyme in Géomatique expert, n° 78 (01/01/2011)Permalink