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A statistical characterization of the Galileo-to-GPS inter-system bias / Ciro Gioia in Journal of geodesy, vol 90 n° 11 (November 2016)
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Titre : A statistical characterization of the Galileo-to-GPS inter-system bias Type de document : Article/Communication Auteurs : Ciro Gioia, Auteur ; Daniele Borio, Auteur Année de publication : 2016 Article en page(s) : pp 1279 - 1291 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] diffusion de données
[Termes IGN] données Galileo
[Termes IGN] échelle de temps
[Termes IGN] erreur systématique inter-systèmes
[Termes IGN] récepteur Galileo
[Termes IGN] récepteur GPS
[Termes IGN] signal GalileoRésumé : (Auteur) Global navigation satellite system operates using independent time scales and thus inter-system time offsets have to be determined to enable multi-constellation navigation solutions. GPS/Galileo inter-system bias and drift are evaluated here using different types of receivers: two mass market and two professional receivers. Moreover, three different approaches are considered for the inter-system bias determination: in the first one, the broadcast Galileo to GPS time offset is used to align GPS and Galileo time scales. In the second, the inter-system bias is included in the multi-constellation navigation solution and is estimated using the measurements available. Finally, an enhanced algorithm using constraints on the inter-system bias time evolution is proposed. The inter-system bias estimates obtained with the different approaches are analysed and their stability is experimentally evaluated using the Allan deviation. The impact of the inter-system bias on the position velocity time solution is also considered and the performance of the approaches analysed is evaluated in terms of standard deviation and mean errors for both horizontal and vertical components. From the experiments, it emerges that the inter-system bias is very stable and that the use of constraints, modelling the GPS/Galileo inter-system bias behaviour, significantly improves the performance of multi-constellation navigation. Numéro de notice : A2016-802 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-016-0925-6 En ligne : http://dx.doi.org/10.1007/s00190-016-0925-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82586
in Journal of geodesy > vol 90 n° 11 (November 2016) . - pp 1279 - 1291[article]Toward a direct combination of space-geodetic techniques at the measurement level: Methodology and main issues / David Coulot in Journal of geophysical research : Solid Earth, vol 112 n° B5 (May 2007)
[article]
Titre : Toward a direct combination of space-geodetic techniques at the measurement level: Methodology and main issues Type de document : Article/Communication Auteurs : David Coulot , Auteur ; Philippe Berio, Auteur ; Richard Biancale, Auteur ; Sylvain Loyer, Auteur ; Laurent Soudarin, Auteur ; Anne-Marie Gontier, Auteur Année de publication : 2007 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] analyse comparative
[Termes IGN] erreur systématique inter-systèmes
[Termes IGN] positionnement par DORIS
[Termes IGN] positionnement par GNSS
[Termes IGN] positionnement par ITGB
[Termes IGN] positionnement par télémétrie laser sur satelliteRésumé : (auteur) In the framework of the activities of the Combination Research Centers (CRC) of the International Earth Rotation and Reference Systems Service (IERS), the French Groupe de Recherche en Géodésie Spatiale (GRGS) studies the benefit of combining space-geodetic techniques (Doppler orbitography and radiopositioning integrated by satellite, GPS, satellite laser ranging, and very long baseline interferometry) at the observational level. This combination aims to produce a global and consistent solution for Earth orientation parameters (EOPs), polar motion xp and yp, and universal time UT1 with a 1-day or a 6-hour sampling, as well as weekly station positions. In this paper we present a methodology for multitechnique combination at the observational level. We process the measurements of the four techniques over a 1-year period (the year 2002) in order to illustrate and validate our method. All techniques are processed with the same computational framework, thus with the same models and a priori values for parameters. By using the same software and conventions, we avoid inconsistencies in individual computations. We process each technique individually and inside the combination. The comparison between these solutions is a way of analyzing the power of our method even if the actual status of our software does not reproduce the state-of-the-art analyses of each technique. However, we produce an analysis of the quality of our individual computations so that readers can get an informed appreciation of the current capabilities of our software. Finally, we present the capability of such combinations in terms of accuracy and precision, we underline the main issues of our method and propose solutions to solve them in the future. Numéro de notice : A2007-671 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1029/2006JB004336 En ligne : https://doi.org/10.1029/2006JB004336 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102707
in Journal of geophysical research : Solid Earth > vol 112 n° B5 (May 2007)[article]