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ADOP 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)
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Titre : ADOP in closed form for a hierarchy of multi-frequency single-baseline GNSS models Type de document : Article/Communication Auteurs : Dennis Odijk, Auteur ; Peter J.G. Teunissen, Auteur Année de publication : 2008 Article en page(s) : pp 473 - 492 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] affaiblissement de la précision
[Termes IGN] ambiguïté entière
[Termes IGN] modèle de diffusion du rayonnement
[Termes IGN] positionnement par GNSS
[Termes IGN] propagation du signal
[Termes IGN] résolution d'ambiguïté
[Termes IGN] signal GNSSRésumé : (Auteur) Successful carrier phase ambiguity resolution is the key to high-precision positioning with Global Navigation Satellite Systems (GNSS). The ambiguity dilution of precision (ADOP) is a well-known scalar measure which can be used to infer the strength of the GNSS model for carrier phase ambiguity resolution. In this contribution we present analytical closed-form expressions for the ADOP. This will be done for a whole class of different multi- frequency single baseline models. These models include the geometry-fixed, the geometry-free and the geometry-based models, respectively. And within the class of geometry-based models, we discriminate between short and long observation time spans, and between stationary and moving receivers. The easy-to-use ADOP expressions can be applied to infer the contribution of various GNSS model factors. They comprise, for instance, the type, the number and the precision of the GNSS observations, the number and selection of frequencies, the presence of atmospheric disturbances, the length of the observation time span and the length of the baseline. Copyright Springer Numéro de notice : A2008-320 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-007-0197-2 En ligne : https://doi.org/10.1007/s00190-007-0197-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29313
in Journal of geodesy > vol 82 n° 8 (August 2008) . - pp 473 - 492[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-08071 RAB Revue Centre de documentation En réserve L003 Disponible 266-08072 RAB Revue Centre de documentation En réserve L003 Disponible
[article]
Titre : Galileo gioves come off: military after all Type de document : Article/Communication Auteurs : Anonyme, Auteur Année de publication : 2008 Article en page(s) : pp 10 - 12 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] armée
[Termes IGN] GIOVE (satellite)
[Termes IGN] utilisateur militaireNuméro de notice : A2008-323 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29316
in GPS world > vol 19 n° 8 (August 2008) . - pp 10 - 12[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-08081 RAB Revue Centre de documentation En réserve L003 Disponible vol 19 n° 7 - July 2008 (Bulletin de GPS world)
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Titre : vol 19 n° 7 - July 2008 Type de document : Périodique Année de publication : 2008 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale Numéro de notice : 067-0807 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Numéro de périodique Permalink : https://documentation.ensg.eu/index.php?lvl=bulletin_display&id=21590 [n° ou bulletin] ContientRéservation
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Code-barres Cote Support Localisation Section Disponibilité 067-08071 RAB Revue Centre de documentation En réserve L003 Disponible Resolution 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)
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Titre : Resolution of GPS carrier-phase ambiguities in Precise Point Positioning (PPP) with daily observations Type de document : Article/Communication Auteurs : M. Ge, Auteur ; Gerd Gendt, Auteur ; Markus Rothacher, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 389 - 401 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] ambiguïté entière
[Termes IGN] double différence
[Termes IGN] mesurage de phase
[Termes IGN] positionnement par GNSS
[Termes IGN] positionnement ponctuel précis
[Termes IGN] résolution d'ambiguïté
[Termes IGN] simple différenceRésumé : (Auteur) Precise Point Positioning (PPP) has been demonstrated to be a powerful tool in geodetic and geodynamic applications. Although its accuracy is almost comparable with network solutions, the east component of the PPP results is still to be improved by integer ambiguity fixing, which is, up to now, prevented by the presence of the uncalibrated phase delays (UPD) originating in the receivers and satellites. In this paper, it is shown that UPDs are rather stable in time and space, and can be estimated with high accuracy and reliability through a statistical analysis of the ambiguities estimated from a reference network. An approach is implemented to estimate the fractional parts of the single-difference (SD) UPDs between satellites in wide- and narrow-lane from a global reference network. By applying the obtained SD-UPDs as corrections to the SD-ambiguities at a single station, the corrected SD-ambiguities have a naturally integer feature and can therefore be fixed to integer values as usually done for the double-difference ones in the network mode. With data collected at 450 stations of the International GNSS Service (IGS) through days 106 to 119 in 2006, the efficiency of the presented ambiguity-fixing strategy is validated using IGS Final products. On average, more than 80% of the independent ambiguities could be fixed reliably, which leads to an improvement of about 27% in the repeatability and 30% in the agreement with the IGS weekly solutions for the east component of station coordinates, compared with the real-valued solutions. Copyright Springer Numéro de notice : A2008-317 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-007-0187-4 En ligne : https://doi.org/10.1007/s00190-007-0187-4 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29310
in Journal of geodesy > vol 82 n° 7 (July 2008) . - pp 389 - 401[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-08061 RAB Revue Centre de documentation En réserve L003 Disponible 266-08062 RAB Revue Centre de documentation En réserve L003 Disponible The future is now GPS + GLONASS + SBAS = GNSS / Lambert Wanninger in GPS world, vol 19 n° 7 (July 2008)
[article]
Titre : The future is now GPS + GLONASS + SBAS = GNSS Type de document : Article/Communication Auteurs : Lambert Wanninger, Auteur Année de publication : 2008 Article en page(s) : pp 42 - 48 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] BeiDou
[Termes IGN] Global Navigation Satellite System
[Termes IGN] positionnement par EGNOS
[Termes IGN] positionnement par Galileo
[Termes IGN] positionnement par GLONASS
[Termes IGN] positionnement par GPS
[Termes IGN] système de positionnement par satellitesRésumé : (Auteur) We are on the brink of a new era in satellite positioning and navigation. The excitement that was felt 30 years ago when the first GPS satellite was launched is beginning to be felt again. Back then, instantaneous three-dimensional satellite-based positioning was an entirely new concept. Yes, we did have satellite-based positioning before GPS, but it wasn't instantaneous and it wasn't fully 3D - nor was it very accurate. Over the past 30 years, thousands of scientists and engineers have developed an amazing range of GPS applications providing positioning accuracies all the way down to the millimeter level. However, some would argue that many of the recent developments, especially in the area of high-accuracy positioning, are just minor enhancements to existing techniques first introduced or foretold years ago. Been there, done that. But that situation is about to change -and in a big way! New signals and new satellites herald a new era in satellite-based positioning and navigation. Russia's Global'naya Navigatsionnaya Sputnikovaya Sistema (GLONASS) is being revitalized after many years of neglect. With its first launch in 1982, this second global navigation satellite system gave rise to the generic term for all such systems : GNSS. In addition to GLONASS and a modernized GPS featuring new civil and military signals along with new constellations of satellites, we will have Europe's Galileo system (with two GIOVE test satellites already in orbit) and China's Beidou/Compass system (with five satellites already in orbit). Receivers and data-processing techniques will be developed to allow use of all available signals and satellites. The future promises to be just as exciting for GNSS scientists and engineers as the early days of GPS. But do we have to wait for these new or enhanced systems to be in place before benefiting from a multi-signal, multi-constellation global navigation satellite system? Definitely not. As this month's column describes, we can sample the future to day. The existing GPS satellites, along with the revitalized GLONASS constellation and the satellites of the various geostationary satellite-based augmentation systems, already constitute a system of systems. And receivers currently on the market provide the necessary raw measurement data to yield positioning solutions from this system of systems with potentially more continuity and greater accuracy than those obtained using GPS alone. Listen up: the future is now. Copyright Questex Media Group Inc Numéro de notice : A2008-299 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29292
in GPS world > vol 19 n° 7 (July 2008) . - pp 42 - 48[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-08071 RAB Revue Centre de documentation En réserve L003 Disponible vol 19 n° 6 - June 2008 (Bulletin de GPS world)
PermalinkPermalinkvol 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)
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