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VLBI observations of GNSS-satellites : from scheduling to analysis / Lucia Plank in Journal of geodesy, vol 91 n° 7 (July 2017)  

Public [article]  inJournal of geodesy > vol 91 n° 7 (July 2017) . - pp 867 - 880 Titre : VLBI observations of GNSS-satellites : from scheduling to analysis Type de document : Article/Communication Auteurs : Lucia Plank, Auteur ; Andreas Hellerschmied, Auteur ; Jamie N. McCallum, Auteur ; Johannes Böhm , Auteur ; Jim Lovell, Auteur Année de publication : 2017 Article en page(s) : pp 867 - 880 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] campagne VLBI [Termes IGN] constellation GNSS [Termes IGN] point de liaison (géodésie) [Termes IGN] poursuite de satellite Résumé : (Auteur) The possibility of observing satellites with the very long baseline interferometry (VLBI) technique has been discussed for several years in the geodetic community, with observations of either existing satellites of the global navigation satellite systems or of satellites dedicated to realise a space tie. Such observations were carried out using the Australian telescopes in Hobart and Ceduna which, for the first time, integrated all the necessary steps: planning the observations (automated scheduling), correlation of the data and the generation of a series of time delay observables suitable for a subsequent geodetic analysis. We report on the development of new and the adaptation of existing routines for observing and data processing, focusing on technology development. The aim was to use methods that are routinely used in geodetic VLBI. A series of test experiments of up to six hours duration was performed, allowing to improve the observations from session to session and revealing new problems still to be solved. The newly developed procedures and programs now enable more observations. Further development assumed, this bears the prospect of being directly applied to the observation of dedicated space-tie satellites. Numéro de notice : A2017-299 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-016-0992-8 En ligne : http://doi.org/10.1007/s00190-016-0992-8 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85334 [article]

Simulating the effects of quasar structure on parameters from geodetic VLBI / Stanislav S. Shabala in Journal of geodesy, vol 89 n° 9 (september 2015)  

Public [article]  inJournal of geodesy > vol 89 n° 9 (september 2015) . - pp 873 - 886 Titre : Simulating the effects of quasar structure on parameters from geodetic VLBI Type de document : Article/Communication Auteurs : Stanislav S. Shabala, Auteur ; Jamie N. McCallum, Auteur ; Lucia Plank, Auteur ; Johannes Böhm , Auteur Année de publication : 2015 Article en page(s) : pp 873 - 886 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] positionnement par GPS [Termes IGN] quasar [Termes IGN] station GPS Résumé : (auteur) We investigate the effects of quasar structure on geodetic very long baseline interferometry (VLBI) measurements. We create catalogues of simulated and real quasars with a range of structure indices, and use these to generate synthetic CONT11 observations with the Vienna VLBI Software simulator tool. We systematically investigate the effects of quasars with different amounts of source structure, and find that source structure can affect station positions at the one-millimetre level. This effect is stronger for isolated stations. Overall, source structure is found to contribute to about 10 % of the troposphere and clock effects. Our simulations confirm analytical predictions that source structure mitigation strategies must be developed in order to achieve millimetre-level VLBI position accuracy. Numéro de notice : A2015-876 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-015-0820-6 Date de publication en ligne : 13/05/2015 En ligne : https://doi.org/10.1007/s00190-015-0820-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79406 [article]

Precise station positions from VLBI observations to satellites: a simulation study / Lucia Plank in Journal of geodesy, vol 88 n° 7 (July 2014)  

Public [article]  inJournal of geodesy > vol 88 n° 7 (July 2014) . - pp 659 - 673 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 mondial Résumé : (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 [article]

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