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Orbit computation of the TELECOM-2D satellite with a genetic algorithm / Florent Deleflie in Proceedings of the International astronomical union, vol 9 S310 (Juillet 2014)
[article]
Titre : Orbit computation of the TELECOM-2D satellite with a genetic algorithm Type de document : Article/Communication Auteurs : Florent Deleflie, Auteur ; David Coulot , Auteur ; Alain Vienne, Auteur ; Romain Decosta, Auteur ; Pascal Richard, Auteur ; Mohamed-Amjad Lasri , Auteur Année de publication : 2014 Article en page(s) : pp 146 - 149 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Techniques orbitales
[Termes IGN] algorithme génétique
[Termes IGN] orbite
[Termes IGN] orbitographie
[Termes IGN] trajectoire (véhicule non spatial)Résumé : (auteur) In order to test a preliminary orbit determination method, we fit an orbit of the geostationary satellite TELECOM-2D, as if we did not know any a priori information on its trajectory. The method is based on a genetic algorithm coupled to an analytical propagator of the trajectory, that is used over a couple of days, and that uses a whole set of altazimutal data that are acquired by the tracking network made up of the two TAROT telescopes. The adjusted orbit is then compared to a numerical reference. The method is described, and the results are analyzed, as a step towards an operational method of preliminary orbit determination for uncatalogued objects. Numéro de notice : A2014-793 Affiliation des auteurs : LASTIG LAREG+Ext (2012-mi2018) Thématique : INFORMATIQUE/POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1017/S1743921314008072 Date de publication en ligne : 05/01/2015 En ligne : http://dx.doi.org/10.1017/S1743921314008072 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79973
in Proceedings of the International astronomical union > vol 9 S310 (Juillet 2014) . - pp 146 - 149[article]Precise station positions from VLBI observations to satellites: a simulation study / Lucia Plank in Journal of geodesy, vol 88 n° 7 (July 2014)
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Titre : Precise station positions from VLBI observations to satellites: a simulation study Type de document : Article/Communication Auteurs : Lucia Plank, Auteur ; Johannes Böhm , Auteur ; Harald Schuh, Auteur Année de publication : 2014 Article en page(s) : pp 659 - 673 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] orbite
[Termes IGN] positionnement par ITGB
[Termes IGN] poursuite de satellite
[Termes IGN] station GPS
[Termes IGN] système de référence mondialRésumé : (Auteur) Very long baseline interferometry (VLBI) tracking of satellites is a topic of increasing interest for the establishment of space ties. This shall strengthen the connection of the various space geodetic techniques that contribute to the International Terrestrial Reference Frame. The concept of observing near-Earth satellites demands research on possible observing strategies. In this paper, we introduce this concept and discuss its possible benefits for improving future realizations of the International Terrestrial Reference System. Using simulated observations, we develop possible observing strategies that allow the determination of radio telescope positions in the satellite system on Earth with accuracies of a few millimeters up to 1–2 cm for weekly station coordinates. This is shown for satellites with orbital heights between 2,000 and 6,000 km, observed by dense regional as well as by global VLBI-networks. The number of observations, as mainly determined by the satellite orbit and the observation interval, is identified as the most critical parameter that affects the expected accuracies. For observations of global positioning system satellites, we propose the combination with classical VLBI to radio sources or a multi-satellite strategy. Both approaches allow station position repeatabilities of a few millimeters for weekly solutions. Numéro de notice : A2014-413 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-014-0712-1 Date de publication en ligne : 23/03/2014 En ligne : https://doi.org/10.1007/s00190-014-0712-1 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=73950
in Journal of geodesy > vol 88 n° 7 (July 2014) . - pp 659 - 673[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 266-2014071 SL Revue Centre de documentation Revues en salle Disponible A near-real-time automatic orbit determination system for COSMIC and its follow-on satellite mission: analysis of orbit and clock errors on radio occultation / Yi-Shan Li in IEEE Transactions on geoscience and remote sensing, vol 52 n° 6 Tome 1 (June 2014)
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Titre : A near-real-time automatic orbit determination system for COSMIC and its follow-on satellite mission: analysis of orbit and clock errors on radio occultation Type de document : Article/Communication Auteurs : Yi-Shan Li, Auteur ; Cheinway Hwang, Auteur ; Tzu-Pang Tseng, Auteur ; et al., Auteur Année de publication : 2014 Article en page(s) : pp 3192 - 3210 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Technologies spatiales
[Termes IGN] mécanique orbitale
[Termes IGN] mission spatiale
[Termes IGN] orbitographie
[Termes IGN] temps réel
[Termes IGN] trajectographie (positionnement)Résumé : (Auteur) The COSMIC-2 mission is a follow-on mission of the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) with an upgraded payload for improved radio occultation (RO) applications. The objective of this paper is to develop a near-real-time (NRT) orbit determination system, called NRT National Chiao Tung University (NCTU) system, to support COSMIC-2 in atmospheric applications and verify the orbit product of COSMIC. The system is capable of automatic determinations of the NRT GPS clocks and LEO orbit and clock. To assess the NRT (NCTU) system, we use eight days of COSMIC data (March 24-31, 2011), which contain a total of 331 GPS observation sessions and 12 393 RO observable files. The parallel scheduling for independent GPS and LEO estimations and automatic time matching improves the computational efficiency by 64% compared to the sequential scheduling. Orbit difference analyses suggest a 10-cm accuracy for the COSMIC orbits from the NRT (NCTU) system, and it is consistent as the NRT University Corporation for Atmospheric Research (URCA) system. The mean velocity accuracy from the NRT orbits of COSMIC is 0.168 mm/s, corresponding to an error of about 0.051 urad in the bending angle. The rms differences in the NRT COSMIC clock and in GPS clocks between the NRT (NCTU) and the postprocessing products are 3.742 and 1.427 ns. The GPS clocks determined from a partial ground GPS network [from NRT (NCTU)] and a full one [from NRT (UCAR)] result in mean rms frequency stabilities of 6.1E-12 and 2.7E-12, respectively, corresponding to range fluctuations of 5.5 and 2.4 cm and bending angle errors of 3.75 and 1.66 urad . Numéro de notice : A2014-307 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2013.2271547 En ligne : https://doi.org/10.1109/TGRS.2013.2271547 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33210
in IEEE Transactions on geoscience and remote sensing > vol 52 n° 6 Tome 1 (June 2014) . - pp 3192 - 3210[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 065-2014061A RAB Revue Centre de documentation En réserve L003 Disponible Reducing the draconitic errors in GNSS geodetic products / C.J. Rodriguez-Solano in Journal of geodesy, vol 88 n° 6 (June 2014)
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Titre : Reducing the draconitic errors in GNSS geodetic products Type de document : Article/Communication Auteurs : C.J. Rodriguez-Solano, Auteur ; Urs Hugentobler, Auteur ; et al., Auteur Année de publication : 2014 Article en page(s) : pp 559 - 574 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] éclipse (astronomie)
[Termes IGN] harmonique sphérique
[Termes IGN] lacet
[Termes IGN] positionnement par GNSS
[Termes IGN] rayonnement solaireRésumé : (Auteur) Systematic errors at harmonics of the GPS draconitic year have been found in diverse GPS-derived geodetic products like the geocenter Z -component, station coordinates, Y -pole rate and orbits (i.e. orbit overlaps). The GPS draconitic year is the repeat period of the GPS constellation w.r.t. the Sun which is about 351 days. Different error sources have been proposed which could generate these spurious signals at the draconitic harmonics. In this study, we focus on one of these error sources, namely the radiation pressure orbit modeling deficiencies. For this purpose, three GPS+GLONASS solutions of 8 years (2004–2011) were computed which differ only in the solar radiation pressure (SRP) and satellite attitude models. The models employed in the solutions are: (1) the CODE (5-parameter) radiation pressure model widely used within the International GNSS Service community, (2) the adjustable box-wing model for SRP impacting GPS (and GLONASS) satellites, and (3) the adjustable box-wing model upgraded to use non-nominal yaw attitude, specially for satellites in eclipse seasons. When comparing the first solution with the third one we achieved the following in the GNSS geodetic products. Orbits: the draconitic errors in the orbit overlaps are reduced for the GPS satellites in all the harmonics on average 46, 38 and 57 % for the radial, along-track and cross-track components, while for GLONASS satellites they are mainly reduced in the cross-track component by 39 %. Geocenter Z -component: all the odd draconitic harmonics found when the CODE model is used show a very important reduction (almost disappearing with a 92 % average reduction) with the new radiation pressure models. Earth orientation parameters: the draconitic errors are reduced for the X -pole rate and especially for the Y -pole rate by 24 and 50 % respectively. Station coordinates: all the draconitic harmonics (except the 2nd harmonic in the North component) are reduced in the North, East and Height components, with average reductions of 41, 39 and 35 % respectively. This shows, that part of the draconitic errors currently found in GNSS geodetic products are definitely induced by the CODE radiation pressure orbit modeling deficiencies Numéro de notice : A2014-287 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-014-0704-1 Date de publication en ligne : 07/03/2014 En ligne : https://doi.org/10.1007/s00190-014-0704-1 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33190
in Journal of geodesy > vol 88 n° 6 (June 2014) . - pp 559 - 574[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 266-2014061 SL Revue Centre de documentation Revues en salle Disponible Cartes lunaires / Frank Tétart in Carto, le monde en cartes, n° 22 (mars - avril 2014)
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Titre : Cartes lunaires Type de document : Article/Communication Auteurs : Frank Tétart, Auteur Année de publication : 2014 Article en page(s) : pp 76 - 77 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Cartographie
[Termes IGN] carte géologique
[Termes IGN] carte photographique
[Termes IGN] carte thématique
[Termes IGN] Lune
[Termes IGN] sonde spatiale
[Termes IGN] spatiocarteRésumé : (Auteur) Le 18 décembre 2013, la sonde spatiale chinoise Chang'e 3, d'après le nom de la déesse chinoise de la Lune, s'est posée en douceur sur le sol du satellite terrestre. Un exploit pour la République populaire, qui réalise ainsi son entrée dans le cercle restreint des puissances spatiales et dans celui encore plus fermé des états ayant réalisé un alunissage. L'occasion de regarder quelques cartes de cet astre qui fascine les êtres humains depuis les débuts de l'humanité. Numéro de notice : A2014-171 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33076
in Carto, le monde en cartes > n° 22 (mars - avril 2014) . - pp 76 - 77[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 154-2014021 RAB Revue Centre de documentation En réserve L003 Disponible Trajectory models and reference frames for crustal motion geodesy / Michael Bevis in Journal of geodesy, vol 88 n° 3 (March 2014)PermalinkPermalinkPermalinkA technique for routinely updating the ITU-R database using radio occultation electron density profiles / Claudio Brunini in Journal of geodesy, vol 87 n° 9 (September 2013)PermalinkInformation content of very high resolution SAR images: study of feature extraction and imaging parameters / Corneliu Dimitru in IEEE Transactions on geoscience and remote sensing, vol 51 n° 8 (August 2013)PermalinkPermalinkNicolas-Louis de La Caille : astronome et géodésien / Ian S. Glass (2013)PermalinkPermalinkPerformance of real-time precise point positioning / Junping Chen in Marine geodesy, vol 36 n° 1 (January - March 2013)Permalinkvol 50 n° 12 - December 2012 - Special issue on the chinese fengyun (FY)-3 satellite instrument calibration and applications (Bulletin de IEEE Transactions on geoscience and remote sensing) / Geoscience and remote sensing societyPermalink