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On the accuracy assessment of celestial reference frame realizations / Z. Malkin in Journal of geodesy, vol 82 n° 6 (June 2008)
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Titre : On the accuracy assessment of celestial reference frame realizations Type de document : Article/Communication Auteurs : Z. Malkin, Auteur Année de publication : 2008 Article en page(s) : pp 325 - 329 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] données ITGB
[Termes IGN] estimation de précision
[Termes IGN] précision des données
[Termes IGN] repère de référence céleste
[Termes IGN] système de référence célesteRésumé : (Auteur) The scatter of the celestial pole offset (CPO) time-series obtained from very long baseline interferometry (VLBI) observations is used as a measure of the accuracy of celestial reference frame (CRF) realizations. Several scatter indices (SI), including some proposed for the first time, are investigated. The first SI is based on residual analysis of CPO series with respect to a free core nutation (FCN) model. The second group of SIs includes Allan deviation and its extensions, which allow the treatment of unequally weighted and multidimensional observations. Application of these criteria to several radio source catalogues (RSCs) showed their ability to perform a preliminary assessment of the quality of each RSC. The 2D Allan deviation estimate seems to be the most sensitive measure. The proposed extensions of Allan deviation, weighted and multidimensional, can also be used for the statistical analysis of other time-series. Copyright Springer Numéro de notice : A2008-314 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-007-0181-x En ligne : https://doi.org/10.1007/s00190-007-0181-x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29307
in Journal of geodesy > vol 82 n° 6 (June 2008) . - pp 325 - 329[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-08051 SL Revue Centre de documentation Revues en salle Disponible n° 10 - 01/06/2008 - Spécial Spatial (Bulletin de Le magazine de l'observatoire de Paris) / Observatoire de Paris
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Titre : n° 10 - 01/06/2008 - Spécial Spatial Type de document : Périodique Auteurs : Observatoire de Paris, Auteur Année de publication : 2008 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Missions spatiales
[Termes IGN] Galileo
[Termes IGN] GIOVE (satellite)Numéro de notice : 10199 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Numéro de périodique Permalink : https://documentation.ensg.eu/index.php?lvl=bulletin_display&id=10297 [n° ou bulletin]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 10199-01 Revue Centre de documentation Indéterminé Disponible GIOVE-B on the ai r: understanding Galileo's new signals / G. Gao in Inside GNSS, vol 3 n° 4 (May - June 2008)
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Titre : GIOVE-B on the ai r: understanding Galileo's new signals Type de document : Article/Communication Auteurs : G. Gao, Auteur ; Dennis M. Akos, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : 4 p. ; pp 34 - 37 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] GIOVE (satellite)
[Termes IGN] signal GalileoRésumé : (Editeur) Following up on their earlier work analyzing and decoding new GNSS signals, researchers from Stanford University and the University of Colorado confirm that GIOVE-B transmits on L1, E5a, and E5b bands with MBOC modulation in L1, and finds the PRN generators in all bands to be 13- or 14-stage Gold codes, not the memory codes specified in the Galileo ICD. Copyright Gibbons Media & Research LLC Numéro de notice : A2008-646 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33525
in Inside GNSS > vol 3 n° 4 (May - June 2008) . - 4 p. ; pp 34 - 37[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 159-08041 SL Revue Centre de documentation Revues en salle Disponible Documents numériques
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GIOVE-B on the air ... - pdf éditeurAdobe Acrobat PDFGLONASS, a new look for the 21st century / Glen Gibbons in Inside GNSS, vol 3 n° 4 (May - June 2008)
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Titre : GLONASS, a new look for the 21st century Type de document : Article/Communication Auteurs : Glen Gibbons, Auteur Année de publication : 2008 Article en page(s) : 2 p. ; pp 16 - 17 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] constellation GLONASS
[Termes IGN] Global Orbitography Navigation Satellite SystemRésumé : (Editeur) Russia has an ambitious program in store for its GNSS system: more signals - including CDMA, a larger constellation, expanded augmentation system, and modernized ground control and integrity monitoring. Copyright Gibbons Media & Research LLC Numéro de notice : A2008-645 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33524
in Inside GNSS > vol 3 n° 4 (May - June 2008) . - 2 p. ; pp 16 - 17[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 159-08041 SL Revue Centre de documentation Revues en salle Disponible Documents numériques
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GLONASS, a new look for ... - pdf éditeurAdobe Acrobat PDFMaking a difference with GPS: time differences for kinematic positioning with low-cost receivers / J. Traugott in GPS world, vol 19 n° 5 (May 2008)
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Titre : Making a difference with GPS: time differences for kinematic positioning with low-cost receivers Type de document : Article/Communication Auteurs : J. Traugott, Auteur ; Dennis Odijk, Auteur ; Oliver Montenbruck, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 48 - 54 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal
[Termes IGN] GPS en mode différentiel
[Termes IGN] phase GPS
[Termes IGN] positionnement cinématique
[Termes IGN] récepteur GPS
[Termes IGN] traitement de données GNSSRésumé : (Editeur) Most radio signals consist of a carrier wave that is modulated in some way. This includes the GPS satellite signals. The pseudorandom-noise ranging codes and the navigation message are modulated onto the L-band carriers using binary biphase modulation. A GPS receiver uses the ranging codes to determine its distance from multiple satellites and then, through the process of multilateration, its position. But what about the carrier phase? Is it just a means to convey the ranging codes and navigation message? Definitely not. A GPS receiver determines its velocity as well as its position and it does this not by differencing sequential code-based positions, which would not be very accurate, but rather by measuring the Doppler shift of the received carrier. But the carrier can be used in other ways too. In fact, it can be used for determining positions, just like the code, but with much higher precision. Over 20 years ago, surveyors and geodesists devised ways to make use of recorded measurements of the phase of the received carriers to determine accurate relative positions between a roving receiver and a base or reference receiver at a known location. The technique was enhanced over the years, evolving into an approach known as RTK or real-time kinematic positioning. As its name suggests, RTK is usually employed in real time using auxiliary radio communications (often cell-phone-based) between the base and rover receivers. However, RTK-style positioning can also be used to postprocess collected data, achieving the same high-accuracy standards. But one of the difficulties with the RTK approach is resolving the so-called carrier-phase ambiguities. One cycle of the carrier looks just like the next, so how can you determine the exact number of cycles in the carrier between the satellite's antenna and the receiver's antenna? Well, it can be done, but even with increasingly sophisticated techniques, there is a limit to how far away a rover can be from the base station. Isn't there a way to get rid of the integer ambiguity problem? There is. If you time-difference sequential carrier-phase measurements, the ambiguity actually disappears! As we'll see in this month's column, you can determine accurate relative positions using time-differenced carrier-phase measurements. But there are some caveats. Read on. Copyright Questex Media Group Inc Numéro de notice : A2008-164 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29159
in GPS world > vol 19 n° 5 (May 2008) . - pp 48 - 54[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-08051 RAB Revue Centre de documentation En réserve L003 Disponible PermalinkLength-of-day and space-geodetic determination of the Earth's variable gravity field / G. Bourda in Journal of geodesy, vol 82 n° 4-5 (April - May 2008)
PermalinkA new method for three-carrier GNSS ambiguity resolution / U. Fernandez-Plazaola in Journal of geodesy, vol 82 n° 4-5 (April - May 2008)
PermalinkAn empirical study of the effects of NLP components on Geographic IR performance / N. Stokes in International journal of geographical information science IJGIS, vol 22 n° 3 (march 2008)
PermalinkA compression format and tools for GNSS observation data / Yuki Hatanaka in Bulletin of the Geographical survey institute, vol 55 (March 2008)
PermalinkA conceptual density-based approach for the disambiguation of toponyms / D. Buscaldi in International journal of geographical information science IJGIS, vol 22 n° 3 (march 2008)
PermalinkFast error analysis of continuous GPS observations / M. Bos in Journal of geodesy, vol 82 n° 3 (March 2008)
PermalinkPermalinkPermalinkImproving long-range RTK: getting a better handle on the biases / D. Kim in GPS world, vol 19 n° 3 (March 2008)
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