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The GPS L2C signal: a preliminary analysis of data quality / Rodrigo Figueiredo Leandro in GPS world, vol 19 n° 10 (October 2008)
[article]
Titre : The GPS L2C signal: a preliminary analysis of data quality Type de document : Article/Communication Auteurs : Rodrigo Figueiredo Leandro, Auteur ; R.B. Langley, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 42 - 47 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] longueur d'onde
[Termes IGN] qualité des données
[Termes IGN] signal GPS
[Termes IGN] utilisateur civilRésumé : (Auteur) 56 and counting. That's the number of GPS satellites that have been launched over the past thirty years beginning with the first prototype {Block I) satellite, space vehicle number 1, in February 1978. Ten Block I satellites were successfully launched between 1978 and 1985 to demonstrate the feasibility of GPS. The first satellite of the Block II operational constellation was launched in February 1989. The four year hiatus in launches was due, in part, to the Space Shuttle Challenger disaster as it had been planned to launch the operational satellites using the Shuttle. Following the accident, it was decided to continue with expendable rockets for GPS launches but to switch to the newly designed Delta II rocket. The pace of Block II launches was rapid with five launches of the original Block II design in 1989 and four in 1990 a modified, version of the Block II satellite - the IIA - was develloped, and between 1990 and 1997,19 Block IIAs were launched. The Block II and IIA satellites established the operational GPS constellation. Full operational capability was declared on April 27,1995. A new satellite was developed for replenishing the constellation as the earlier satellites were retired. Following an initial launch failure, twelve of the Block lIR satellites were launched between 1997 and 2004. All of the satellites in the Block I, Block II, Block IIA, and Block llR, constellations transmitted what are now called the legacy signals : tne C/A-code on the L1 frequency of 1575.42 MHz and the P-code on L1 and the L2 frequency of 1227.60 MHz.The P-code has been encrypted to yield the Y-code since January 1994, denying its direct access by most civil users. Since the C/A-code was only transmitted on the L1 frequency, civil users have had to rely on suboptimal semicodeless techniques for the dual-frequency operation necessary for direct cancellation of ionospheric biases. In 1998, Vice-President Al Gore announced that a new civil signal on L2 would be transmitted by future GPS satellites. This new signal-L2C-joined the legacy signals beginning with the launch of modernized Block llR satellite. Six of these blockllR-M satellites have been launched to date.
In this month's column, we'll overview the characteristics of the new L2C signal and take a look at some of the analyses of received signals carried out by a team of researchers from the University of New Brunswick. Copyright Questex Media Group IncNuméro de notice : A2008-397 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29390
in GPS world > vol 19 n° 10 (October 2008) . - pp 42 - 47[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-08101 RAB Revue Centre de documentation En réserve L003 Disponible vol 19 n° 9 - September 2008 (Bulletin de GPS world)
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Titre : vol 19 n° 9 - September 2008 Type de document : Périodique Année de publication : 2008 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale Numéro de notice : 067-0809 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Numéro de périodique Permalink : https://documentation.ensg.eu/index.php?lvl=bulletin_display&id=9605 [n° ou bulletin]ContientRéservation
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Code-barres Cote Support Localisation Section Disponibilité 067-08091 RAB Revue Centre de documentation En réserve L003 Disponible Future time : opportunities for using optical clocks in GNSS systems / A. Moudrak in Inside GNSS, vol 3 n° 6 (September 2008)
[article]
Titre : Future time : opportunities for using optical clocks in GNSS systems Type de document : Article/Communication Auteurs : A. Moudrak, Auteur ; H. Klein, Auteur ; Bernd Eissfeller, Auteur Année de publication : 2008 Article en page(s) : 6 p. ; pp 45 - 50 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] Global Navigation Satellite System
[Termes IGN] horloge
[Termes IGN] secteur spatialRésumé : (Auteur) Satellite clock prediction accuracy may be considerably improved with the emerging optical clock technology. To maximize the performance benefits, optical clocks should be placed onboard the satellites (and on ground to generate the system time). Implementation of optical clocks to keep the system time could increase the accuracy of Galileo timing service (dissemination of UTC) and keep the UTC prediction function within the system. In this case, dependence on an external infrastructure such as the TSP may be reduced. If other contributions to the error budget (mainly, the multipath) were reduced, we might anticipate further significant benefits to user positioning accuracy from improved clock technology, for instance, through exploitation of carrier phase techniques. Placing better clocks on satellites will reduce the need for frequent updates, which will simplify the requirements on ground systems and also reduce costs. If update links were to fail for a significant amount of time, having very good clocks in the space segment would reduce the rate of degradation of the service to users on the ground. Copyright Gibbons Media & Research LLC Numéro de notice : A2008-678 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33531
in Inside GNSS > vol 3 n° 6 (September 2008) . - 6 p. ; pp 45 - 50[article]Documents numériques
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Future time ... - pdf éditeurAdobe Acrobat PDF Galileo down to the millimeter: analyzing a GIOVE-A-B double difference / Christian Tiberius in Inside GNSS, vol 3 n° 6 (September 2008)
[article]
Titre : Galileo down to the millimeter: analyzing a GIOVE-A-B double difference Type de document : Article/Communication Auteurs : Christian Tiberius, Auteur ; Hans van der Marel, Auteur ; Jean-Marie Sleewaegen, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : 5 p. ; pp 40 - 44 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] constellation Galileo
[Termes IGN] données Galileo
[Termes IGN] double différence
[Termes IGN] phase GNSS
[Termes IGN] résolution d'ambiguïté
[Termes IGN] traitement de données GNSSRésumé : (Editeur) With only two spacecraft in orbit for the Galileo constellation that will eventually have 30 satellites, having enough observation time to track and analyze the new signals can pose a challenge. Using a short baseline set-up and a late-night session, however, these authors were able to collect simultaneous measurements from both satellites, perform a double-difference resolution of the carrier phase cycle ambiguity, and assess the measurement noise. Copyright Gibbons Media & Research LLC Numéro de notice : A2008-680 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33532
in Inside GNSS > vol 3 n° 6 (September 2008) . - 5 p. ; pp 40 - 44[article]Documents numériques
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Galileo down to the millimeter ... - pdf éditeurAdobe Acrobat PDF GNSS solutions: quantifying the performance of navigation systems and standards for assisted-GNSS / Sam Pullen in Inside GNSS, vol 3 n° 6 (September 2008)
[article]
Titre : GNSS solutions: quantifying the performance of navigation systems and standards for assisted-GNSS Type de document : Article/Communication Auteurs : Sam Pullen, Auteur ; J. Syrjarinne, Auteur ; L. Wirola, Auteur Année de publication : 2008 Article en page(s) : 5 p. ; pp 20 - 24 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] GNSS assisté pour la navigation
[Termes IGN] intégrité des données
[Termes IGN] précisionRésumé : (Documentaliste) Cet article regroupe deux sujets traités par des auteurs différents qui s'efforcent de définir d'une part ce qu'est le GNSS assisté et les besoins d'évolution dans les normes, d'autre part comment on peut évaluer la qualité d'un système de positionnement par satellites en terme d'intégrité, de précision, de disponibilité, de pérennité. Numéro de notice : A2008-677 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33522
in Inside GNSS > vol 3 n° 6 (September 2008) . - 5 p. ; pp 20 - 24[article]Documents numériques
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GNSS solutions ... - pdf éditeurAdobe Acrobat PDF MBOC vs BOC (1,1): multipath comparison based on GIOVE-B data / A. Simsky in Inside GNSS, vol 3 n° 6 (September 2008)PermalinkA systematic investigation of optimal carrier-phase combinations for modernized triple-frequency GPS / Marc Cocard in Journal of geodesy, vol 82 n° 9 (September 2008)PermalinkThe Bayesian detection of discontinuities in a polynomial regression and its application to the cycle-slip problem / M.C. DE Lacy in Journal of geodesy, vol 82 n° 9 (September 2008)PermalinkThe view from Chilbolton: in-orbit test results from the second Galileo satellite / G. Gatti in Inside GNSS, vol 3 n° 6 (September 2008)Permalinkvol 19 n° 8 - August 2008 (Bulletin de GPS world)PermalinkADOP in closed form for a hierarchy of multi-frequency single-baseline GNSS models / Dennis Odijk in Journal of geodesy, vol 82 n° 8 (August 2008)PermalinkGalileo gioves come off: military after all / Anonyme in GPS world, vol 19 n° 8 (August 2008)Permalinkvol 19 n° 7 - July 2008 (Bulletin de GPS world)PermalinkResolution of GPS carrier-phase ambiguities in Precise Point Positioning (PPP) with daily observations / M. Ge in Journal of geodesy, vol 82 n° 7 (July 2008)PermalinkThe future is now GPS + GLONASS + SBAS = GNSS / Lambert Wanninger in GPS world, vol 19 n° 7 (July 2008)Permalinkvol 19 n° 6 - June 2008 (Bulletin de GPS world)PermalinkGNSS update / Huibert-Jan Lekkerkerk in Geoinformatics, vol 11 n° 4 (01/06/2008)Permalinkvol 19 n° 5 - May 2008 (Bulletin de GPS world)PermalinkGIOVE-B on the ai r: understanding Galileo's new signals / G. Gao in Inside GNSS, vol 3 n° 4 (May - June 2008)PermalinkGLONASS, a new look for the 21st century / Glen Gibbons in Inside GNSS, vol 3 n° 4 (May - June 2008)Permalinkvol 19 n° 4 - April 2008 (Bulletin de GPS world)Permalinkvol 19 n° 3 - March 2008 (Bulletin de GPS world)PermalinkA compression format and tools for GNSS observation data / Yuki Hatanaka in Bulletin of the Geographical survey institute, vol 55 (March 2008)PermalinkFast error analysis of continuous GPS observations / M. Bos in Journal of geodesy, vol 82 n° 3 (March 2008)PermalinkLarge-scale errors in ERS altimeter data / J.Y. Cherniawsky in Marine geodesy, vol 31 n° 1 (March - May 2008)Permalinkvol 19 n° 2 - February 2008 (Bulletin de GPS world)PermalinkGALILEO validation: the validation message / M. Tossaint in GPS world, vol 19 n° 2 (February 2008)PermalinkGOCE's measurements of the gravity field and beyond / R. Floberghaben in ESA bulletin, n° 133 (February 2008)Permalinkvol 19 n° 1 - January 2008 (Bulletin de GPS world)PermalinkPermalinkAnalysis of 13 years (1993-2005) of Satellite Laser Ranging data on the two LAGEOS satellites for Terrestrial Reference Frames and Earth Orientation Parameters / David Coulot (2008)PermalinkAnomalous harmonics in the spectra of GPS position estimates / Jim Ray in GPS solutions, vol 12 n° 1 (January 20008)PermalinkBulletin mensuel d'actualités sur Galileo, octobre 2007 - ocotbre 2008 / Jonathan Chenal (2008)PermalinkDéveloppement 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)PermalinkDifférents types de récepteurs GPS et de modes de réception / Michel Kasser in Géomètre, n° 2044 (janvier 2008)PermalinkPermalinkGalileo / François Barlier (2008)PermalinkGNSS, Global Navigation Satellite Systems / Bernhard Hofmann-Wellenhof (2008)PermalinkGPS composite clock analysis / James R. Wright in International Journal of Navigation and Observation, vol 2008 (01/01/2008)PermalinkPermalinkPermalinkPermalinkLocal ties, VLBI-GPS eccentricities and combination of geodetic reference frames / Claudio Abbondanza (2008)PermalinkMutual validation of satellite-geodetic techniques and its impact on GNSS orbit modeling / Claudia Flohrer (2008)PermalinkPrinciples of GNSS, inertial, and multisensor integrated navigation systems / Paul D. Groves (2008)PermalinkProceedings of the 15th international workshop on laser ranging, Canberra, Australia, 15 - 20 October 2006 / J. Luck (2008)PermalinkPermalinkvol 18 n° 12 - December 2007 (Bulletin de GPS world)PermalinkCode single point positioning using nominal GNSS constellations (future perception) / Ashraf Farah in Artificial satellites. Planetary geodesy, vol 42 n° 3 (September 2007)PermalinkComparison of very long baseline interferometry, GPS, and satellite laser ranging height residuals from ITRF2005 using spectral and correlation methods / Xavier Collilieux in Journal of geophysical research : Solid Earth, vol 112 n° B12 (December 2007)Permalink