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GGSP : Realisation and maintenance of the Galileo terrestrial reference frame / Gerd Gendt in Advances in space research, vol 47 n° 2 ([15/01/2011])  

Public [article]  inAdvances in space research > vol 47 n° 2 [15/01/2011] . - pp 174 - 185 Titre : GGSP : Realisation and maintenance of the Galileo terrestrial reference frame Type de document : Article/Communication Auteurs : Gerd Gendt, Auteur ; Zuheir Altamimi , Auteur ; Rolf Dach, Auteur ; Wolfgang Söhne, Auteur Année de publication : 2011 Article en page(s) : pp 174 - 185 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] Galileo [Termes IGN] Galileo Geodetic Service Provider [Termes IGN] Galileo Terrestrial Reference Frame [Termes IGN] International Terrestrial Reference Frame [Termes IGN] orbitographie Résumé : (Auteur) The realisation and maintenance of a Galileo Terrestrial Reference Frame (GTRF) is the main function of the Galileo Geodetic Service Provider (GGSP). The GTRF shall be compatible with the latest International Terrestrial Reference Frame (ITRF) within a precision level of 3 cm (2 sigma). The connection to the ITRF is realized and validated by stations of the International GNSS Service (IGS) and by geodetic local ties to stations equipped with other geodetic techniques. It is demonstrated that this GTRF can be maintained by including the Galileo Signal-in-Space data, once Galileo reaches its operational stage. The GGSP will also provide additional products, such as Earth Rotation Parameters, satellites orbits, clock corrections for satellites and stations, which will be offered to the Galileo user community to have most precise access to the GTRF and will be used to monitor the accuracy of the corresponding Galileo Mission Segment. The GGSP was built up in time, and for a final demonstration the full system was operated for an interval of 6 months. During that time also microwave data from the two active GIOVE satellites were used. The GGSP Consortium followed the most up to date IGS standards of weekly processing during seven monthly campaigns (November 2006 to June 2008) and a continuous processing from September 2008 to February 2009 delivering several versions of the GTRF. The latest GTRF solution (GTRF09v01) has an RMS position difference with respect to the ITRF2005 computed over the 71 common stations of 1.1 and 2.9 mm in the horizontal and vertical components, respectively. The RMS velocity differences are 0.3 and 0.6 mm/y, respectively. The GGSP GPS satellite orbits and clock corrections agree with the IGS Final products at a level of 5–11 mm and 0.02–0.03 ns, respectively. Numéro de notice : A2011-588 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2010.02.001 Date de publication en ligne : 06/02/2010 En ligne : https://doi.org/10.1016/j.asr.2010.02.001 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90663 [article]

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)

Public [article]  inJournal of geodesy > vol 82 n° 7 (July 2008) . - pp 389 - 401 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 différence Résumé : (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 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29310 [article]

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IGS Special topics and new directions / Gerd Gendt (1996)

Public Titre : IGS Special topics and new directions : workshop proceedings, Postdam, May 15 - 18, 1995 Type de document : Actes de congrès Auteurs : Gerd Gendt, Éditeur scientifique ; Galina Dick, Éditeur scientifique Congrès : IGS 1995, workshop Special topics and new directions (15 - 18 mai 1995; Potsdam, Allemagne), Auteur Editeur : Postdam : GeoForschungsZentrum Postdam Année de publication : 1996 Importance : 250 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] atmosphère terrestre [Termes IGN] Continuously Operating Reference Station network [Termes IGN] Global Positioning System [Termes IGN] International Terrestrial Reference Frame [Termes IGN] modélisation Note de contenu : Session 1 The IGS in 1994 Session 2 New directions of IGS - Applications of the IGS in the next decade / WG Melbourne and RE Neilan - GPS meteorology and the International GPS Service / M Bevis and S Businger - Ionospheric research and future contributions of the IGS network / N Jakowski - Applications and uses of IGS information / GT Johnston - The University Navstar Consortium: Global Positioning for geosciences research / RH Ware Session 3 The IGS and the Earth's atmosphere Global Monitoring of Ionospheric Total Electron Content Using the IGS Network / A J Mannucci, B D Wilson, Dah-Ning Yuan, U J Lindqwister and T F Runge Monitoring Ionospheric Disturbances Using the IGS Network / L Wanninger Real-time Monitoring of the Ionosphere / E Engler, E Sardon, N Jakowski, A Jungstand and D Klahn Global and Regional Ionosphere Models Using the GPS Double Difference Phase Observable / S Schaer, G Beutler, L Mervart, M Rothacher and U Wild Application of IGS Data to GPS Sensing of the Atmosphere for Weather and Climate Research / C Rocken, F S Solheim, R H Ware, M Exner, D Martin and M Rothacher A Review of the NOAA Geosciences Lab's Automated Water Vapor Project / M S Schenewerk, G L Mader, T M vanDam and W E Carter Consistency in the Troposphere Estimations Using the IGS Network / G Gendt and G Beutler Session 4 Orbits, Clocks, and Other Modeling Issues A new Model for GPS Yaw Attitude / Y E Bar-Sever Estimation of Precise GPS Clock Bias Values by the ESOC IGS Analysis Centre / T J Martin Mur The Perturbation of the Orbital Elements of GPS Satellites Through Direct Radiation Pressure and y-Bias / Rothacher, G Beutler and L Mervart An Estimate of Ocean-Loading Effects on Baseline Repeatability from GPS Observations / M S Schenewerk G L Mader and T M vanDam EMR Clock Estimation / P Tetreault, J Kouba, R Ferland and J Popelar Session 5 Technical Aspects of the Densification analysis issues Type Two Associate Analysis at Newcastle-upon-Tyne / P Davies and G Blewitt ITRF and IGS Regional Densifications / C Boucher Determination of Antenna Phase Center Variations Using GPS Data / M Rothacher, S Schaer, L Mervart and G Beutler Australian, Antarctica, Pacific, and Indian Plate Velocities Using the IGS Network / K M Larson and J T Freymueller network and communication issues The Finnish Permanent GPS Array FinnNet: Current Status / J Kakkuri, H Koivula, M Otlikainen, M Paunonen, M Poutanen and M Vermeer The Central Europe Regional Geodynamic Project and its Relation to IGS / P Pesec Experience with Data Flow in the CORS Network / W Strange, N Weston and M Schenewerk APPENDIX Control GPS Networks for the Geophysical Applications (Russia and CIS) / S K Tatevian Numéro de notice : 15987 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Actes Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=34805

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Analyse der Satelliten-Laserentfernungsmessungen des MERIT-Projektes zur Bestimmung präziser Erdrotationsparameter / H. Montag (1986)

Public Titre : Analyse der Satelliten-Laserentfernungsmessungen des MERIT-Projektes zur Bestimmung präziser Erdrotationsparameter Titre original : [Analyse de télémétrie laser sur satellite du projet MERIT pour la détermination des paramètres précis de la rotation terrestre] Type de document : Monographie Auteurs : H. Montag, Auteur ; Gerd Gendt, Auteur ; R. Dietrich, Auteur ; et al., Auteur Editeur : Postdam : Zentralinstitut für Physik der Erde ZPE Année de publication : 1986 Collection : Veröffentlichungen des Zentralinstituts für Physik der Erde, ISSN 0514-8790 num. 91 Importance : 81 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] MERIT [Termes IGN] rotation de la Terre [Termes IGN] télémétrie laser sur satellite Numéro de notice : 52382 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=59341

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