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GNSS update: frequenting frequencies / Huibert-Jan Lekkerkerk in Geoinformatics, vol 12 n° 4 (01/06/2009)
[article]
Titre : GNSS update: frequenting frequencies Type de document : Article/Communication Auteurs : Huibert-Jan Lekkerkerk, Auteur Année de publication : 2009 Article en page(s) : pp 34 - 35 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] positionnement par GNSS
[Termes IGN] signal GPSRésumé : (Auteur) On march 24 the modernization of GPS finally entered a new era. On that day, at 4:34, another GPS IIR-M satellite was launched from Cap Canaveral (USA), this time with the L5 demonstration payload on board. The L5 demonstration payload is needed to comply with international Telecommunication Union Requirements and will pave the way for the third generation of GPS. The start of the transmission for the new L5 signal was on april 10 around (UTC time). Copyright GEOinformatics Numéro de notice : A2009-204 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29834
in Geoinformatics > vol 12 n° 4 (01/06/2009) . - pp 34 - 35[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 262-09041 SL Revue Centre de documentation Revues en salle Disponible On the late northward propagation of the West African monsoon in summer 2006 in the region of Niger/Mali / Philippe Drobinski in Journal of geophysical research : Atmospheres, vol 114 n° D9 (2009)
[article]
Titre : On the late northward propagation of the West African monsoon in summer 2006 in the region of Niger/Mali Type de document : Article/Communication Auteurs : Philippe Drobinski, Auteur ; Sophie Bastin, Auteur ; Serge Janicot, Auteur ; Olivier Bock , Auteur ; A. Dabas, Auteur ; P. Delville, Auteur ; O. Reitebuch, Auteur ; Benjamin Sultan, Auteur Année de publication : 2009 Projets : AMMA & AMMA-2 / Janicot, Serge Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] Afrique occidentale
[Termes IGN] données GPS
[Termes IGN] données météorologiques
[Termes IGN] Mali
[Termes IGN] mousson
[Termes IGN] NigerRésumé : (auteur) This paper investigates the fine‐scale dynamical processes at the origin of the late northward migration of the monsoon flow in summer 2006 in the region of Niger and Mali (onset on 3 July 2006 compared to the climatological onset date, 24 June). Compared to a 28‐year climatology, 2006 NCEP‐2 reanalyses show evidence of an anomalous pattern during 10 days between 25 June and 3 July 2006, characterized by the African Easterly Jet (AEJ) blowing from the northeast along a narrow northeast/southwest band located over the Hoggar and Air mountains associated with an unusually strong northeasterly harmattan in the lee of the mountains. Using data collected during the African Monsoon Multidisciplinary Analysis (AMMA) experiment and mesoscale numerical simulations, this study shows evidence of interaction between the AEJ and the orography supported by the reduced gravity shallow water theory which explains the enhancement of the harmattan downstream of the Hoggar and Air mountains in summer 2006. The enhanced harmattan contributes to move southward the intertropical discontinuity (ITD) defined as the interface between the cool moist southwesterly monsoon flow and the warm dry harmattan. Finally, an interaction between the ITD and African Easterly waves contributes to propagate the ITD southward retreat about 1500 km to the west of the Hoggar and Air mountains. Numéro de notice : A2009-594 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1029/2008JD011159 Date de publication en ligne : 13/05/2009 En ligne : https://doi.org/10.1029/2008JD011159 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=96202
in Journal of geophysical research : Atmospheres > vol 114 n° D9 (2009)[article]Optimistic outlook for Galileo / G. Angrisano in GIM international, vol 23 n° 5 (May 2009)
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Titre : Optimistic outlook for Galileo Type de document : Article/Communication Auteurs : G. Angrisano, Auteur ; E. Rowan, Auteur ; R. Haring, Auteur Année de publication : 2009 Article en page(s) : pp 6 - 13 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] précision du positionnement
[Termes IGN] signal GPSRésumé : (Auteur) This month we bring you an extended interview with engineer Perdo Pedreira, executive director of the European Global Navigation Satellite System Supervisory Authority (GSA). Since July 2005, the body charged with managing the development phase of the much-troubled European Satellite navigation system Galileo, its anticipated economic benefits, in terms of revenue, employment and expanding markets, are many. Galileo is being funded by the EU taxpayer, so it is important that these benefits be realised. Copyright Reed Business Numéro de notice : A2009-243 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29873
in GIM international > vol 23 n° 5 (May 2009) . - pp 6 - 13[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 061-09051 SL Revue Centre de documentation Revues en salle Disponible Synthetic aperture GPS signal processing: concept and feasibility demonstration / A. Soloviev in Inside GNSS, vol 4 n° 3 (May - June 2009)
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Titre : Synthetic aperture GPS signal processing: concept and feasibility demonstration Type de document : Article/Communication Auteurs : A. Soloviev, Auteur ; F. Van Graas, Auteur ; et al., Auteur Année de publication : 2009 Article en page(s) : 12 p. ; pp 37 - 46 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] antenne synthétique
[Termes IGN] atmosphère terrestre
[Termes IGN] brouillage
[Termes IGN] étude de faisabilité
[Termes IGN] interférence
[Termes IGN] signal GPS
[Termes IGN] traitement du signalRésumé : (Auteur) In addition to positioning, navigation and timing, GPS turns out to be a useful sensor for studies of the Earth’s atmosphere. Synthetically generated, phased-array antennas can process GPS signals to create large antenna apertures. The resulting narrow-beam generation capabilities mitigate interference and jamming and produce high-resolution radar images — which could lead to interesting civil and military applications. Copyright Gibbons Media & Research LLC Numéro de notice : A2009-661 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33567
in Inside GNSS > vol 4 n° 3 (May - June 2009) . - 12 p. ; pp 37 - 46[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 159-09031 SL Revue Centre de documentation Revues en salle Disponible Documents numériques
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Synthetic aperture GPS ... - scanAdobe Acrobat PDF The WAAS L5 signal: an assessment of its behavior and potential end use / H. Rho in GPS world, vol 20 n° 5 (May 2009)
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Titre : The WAAS L5 signal: an assessment of its behavior and potential end use Type de document : Article/Communication Auteurs : H. Rho, Auteur ; R.B. Langley, Auteur Année de publication : 2009 Article en page(s) : pp 42 - 48 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal
[Termes IGN] signal GPS
[Termes IGN] signal multidimensionnel
[Termes IGN] test de performance
[Termes IGN] Wide Area Augmentation SystemRésumé : (Auteur) The recent launch of the GPS Block IIR-20(M) satellite and the commissioning of its L5 demonstration payload herald the beginning of a bright new era in space-based positioning, navigation, and timing. The new satellite signal is anticipated to provide better-quality range measurements and possibly improve the tracking performance of a GPS receiver compared with current civil L1 and L2 signals through use of improved signal structures. The L5 signal will be standard on the future Block IIF and Block III satellites.
However, some readers may be surprised to learn that L5 signals have been continuously transmitted by a pair of satellites for the past several years. The geostationary Earth-orbiting (GEO) satellites used by the U.S. Federal Aviation Administration's (FAA's) Wide Area Augmentation System to provide enhanced integrity and accuracy include not only an L1 payload but an L5 payload as well. While the WAAS L5 signals have been broadcast from space for some time, they did not come from a satellite in medium Earth orbit, and so it was necessary to include the demonstration payload on the GPS Block IIR-20(M) satellite to guarantee the L5 frequency filing with the International Telecommunication Union.
There are some differences between the WAAS L5 signals and the future fully fledged GPS L5 signals. The WAAS L5 signals only use a single-channel carrier (there is no quadrature or Q channel) and the data rate is 250 bits per second (bps) rather than 50 bps. The WAAS signals are actually generated on the ground and relayed through the GEOs using a "bent pipe" approach. The FAA uses the L5 signals, in conjunction with the L1 signals, to compute ionospheric delays as part of the closed-loop control of the broadcast signals.
Although the WAAS L5 signals are not yet intended for end users, can they be used now for positioning and navigation and, if so, are there any caveats? In this month's column, I am joined by one of my graduate students, Hyun-ho Rho, who has looked at the WAAS L5 transmissions, examining their signal strengths, multipath characteristics, and instrumental bias issues. Precise positioning performance of WAAS pseudoranges has also been assessed as an independent check on instrumental bias compensation by the WAAS control segment. The favorable results point to a future of the L5 signal, on both the WAAS satellites and the next-generation GPS satellites, which is bright indeed. Copyright Questex Media GroupNuméro de notice : A2009-178 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29808
in GPS world > vol 20 n° 5 (May 2009) . - pp 42 - 48[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-09051 SL Revue Centre de documentation Revues en salle Disponible Development of data infrastructure to support scientific analysis for the International GNSS Service / Carey E. Noll in Journal of geodesy, vol 83 n° 3-4 (March - April 2009)PermalinkMonitoring storm-enhanced density using IGS reference station data / Anthea Coster in Journal of geodesy, vol 83 n° 3-4 (March - April 2009)PermalinkTesting of Global Pressure-Temperature (GPT) Model and Global Mapping Function (GMF) in GPS analyses / Jan Kouba in Journal of geodesy, vol 83 n° 3-4 (March - April 2009)PermalinkThe effects of navigation sensors and spatial road network data quality on the performance of map matching algorithms / M. Quddus in Geoinformatica, vol 13 n° 1 (March 2009)PermalinkPermalinkAutonomous integrity: an error isotropy-based approach for multiple fault conditions / M. Azaola-Saenz in Inside GNSS, Vol 4 n° 1 (January-Fabruary 2009)PermalinkEtude du cycle de l’eau à partir de modèles numériques de prévision météorologique et d’observations sur l’Afrique du Nord / Maïté Lacarra (2009)PermalinkGNSS / Scott Gleason (2009)PermalinkPermalinkImpact of the network effect on the origin and scale: case study of Satellite Laser Ranging / Xavier Collilieux (2009)PermalinkImplémentation de l'intranet scientifique de l'OVSM basé sur des routines Matlab gérant un flux de données scientifiques géoréférencées et amélioration du traitement des données GPS / Benoit Costes (2009)PermalinkIonospheric modeling for precise GNSS applications / Y. Memarzadeh (2009)PermalinkPermalinkGNSS three carrier ambiguity resolution using ionosphere-reduced virtual signals / Y. Feng in Journal of geodesy, vol 82 n° 12 (December 2008)PermalinkWest African Monsoon observed with ground-based GPS receivers during African Monsoon Multidisciplinary Analysis (AMMA) / Olivier Bock in Journal of geophysical research : Atmospheres, vol 113 n° D21 (16 November 2008)PermalinkAmbiguity resolution in the air: mapping without stable GPS signals / J. Hutton in GIM international, vol 22 n° 11 (November 2008)PermalinkCorrection of humidity bias for Vaïsala RS80 sondes during AMMA 2006 Observing Period / Mathieu Nuret in Journal of Atmospheric and Oceanic Technology, vol 25 n° 11 (November 2008)PermalinkFirst AGPS - now BGPS: instantaneous precise positioning anywhere / I. Petrovski in GPS world, vol 19 n° 11 (November 2008)PermalinkPrediction and visualization of GPS multipath signals in urban areas using LiDAR Digital Surface Models and building footprints / J. Li in International journal of geographical information science IJGIS, vol 22 n°11-12 (november 2008)PermalinkWeather Report : Meteorological applications of GNSS from space and on the ground / P. Poli in Inside GNSS, vol 3 n° 8 (November - December 2008)Permalink