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DORIS Starec ground antenna characterization and impact on positioning / Cédric Tourain in Advances in space research, vol 58 n° 12 (15 December 2016)
Titre : DORIS Starec ground antenna characterization and impact on positioning Type de document : Article/Communication Auteurs : Cédric Tourain, Auteur ; Guilhem Moreaux, Auteur ; Albert Auriol, Auteur ; Jérôme Saunier Année de publication : 2016 Article en page(s) : pp 2707 - 2716 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] antenne DORIS
[Termes IGN] caractérisation
[Termes IGN] centre de phase
[Termes IGN] facteur d'échelle
[Termes IGN] International Terrestrial Reference FrameRésumé : (auteur) In a geodetic radio frequency observing system the phase center offsets and phase center variations of ground antennae are a fundamental component of mathematical models of the system observables. In this paper we describe work aimed at improving the DORIS Starec ground antenna phase center definition model. Seven antennas were analyzed in the Compact Antenna Test Range (CATR), a dedicated CNES facility. With respect to the manufacturer specified phase center offset, the measured antennae varied between −6 mm and +4 mm due to manufacturing variations. To solve this problem, discussions were held with the manufacturer, leading to an improvement of the manufacturing process. This work results in a reduction in the scatter to ±1 mm. The phase center position has been kept unchanged and associated phase law has been updated and provided to users of the International DORIS Service (IDS). This phase law is applicable to all Starec antennas (before and after manufacturing process consolidation) and is azimuth independent. An error budget taking into account these updated characteristics has been established for the antenna alone: ±2 mm on the horizontal plane and ±3 mm on the up component, maximum error values for antennas named type C (Saunier et al., 2016) produced with consolidated manufacturing process. Finally the impact of this updated characterization on positioning results has been analyzed and shows a scale offset only of the order of +12 mm for the Terrestrial Reference Frame. Numéro de notice : A2016--185 Affiliation des auteurs : IGN+Ext (2012-2019) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2016.05.013 Date de publication en ligne : 14/05/2016 En ligne : https://doi.org/10.1016/j.asr.2016.05.013 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91820
in Advances in space research > vol 58 n° 12 (15 December 2016) . - pp 2707 - 2716[article]
Titre : Initiating an error budget of the DORIS ground antenna position: Genesis of the Starec antenna type C Type de document : Article/Communication Auteurs : Jérôme Saunier Année de publication : 2016 Article en page(s) : pp 2717 - 2724 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] antenne DORISRésumé : (auteur) The DORIS system measures distances between phase centers of onboard and ground antennas to determine the position of the satellites in their orbits. To this end, the ground antenna phase center position must be known in a terrestrial reference frame. Its position is linked and defined with respect to the antenna reference point (ARP), a conventional physical point for which coordinates are assigned. Although the determination of the ARP position with respect to ground markers can be achieved by traditional surveys, the connection with the actual measurement point (phase center) is far more difficult to determine. This is the main concern explored in this paper. Regardless of the need for a good antenna characterization, CNES and IGN jointly worked to establish a first error budget of the ground antenna position. With this aim in view, each component was clearly identified and studied separately. We distinguished between errors from manufacturing and from site surveying and, on the other hand, errors affecting horizontal and vertical position. The knowledge of the antenna geometry and the guarantee of a good reproducibility in the manufacturing process are essential. Based on these requirements, we have defined new manufacturing specifications to create a new antenna type: Starec type C. Compared to the previous antenna (Starec type B), the standard uncertainty of the 2 GHz phase center position in the vertical direction has been reduced from 5 mm to 1 mm. Following this work, we provide for the new Starec antenna (type C) total uncertainties involved in the ground antenna positioning in a local reference frame: 2 mm in the horizontal plane, 2.5 mm for the vertical component and 3.2 mm in three-dimensional combination. We also propose for DORIS new definitions of conventional points and a new method to determine ground antennas position that were not possible before this manufacturing specifications change. Numéro de notice : A2016--190 Affiliation des auteurs : IGN+Ext (2012-2019) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2016.02.013 Date de publication en ligne : 24/02/2016 En ligne : https://doi.org/10.1016/j.asr.2016.02.013 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91823
in Advances in space research > vol 58 n° 12 (15 December 2016) . - pp 2717 - 2724[article]
Titre : Multi-technique comparison of atmospheric parameters at the DORIS co-location sites during CONT14 Type de document : Article/Communication Auteurs : Robert Heinkelmann, Auteur ; Pascal Willis Année de publication : 2016 Article en page(s) : pp 2758 - 2773 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] analyse comparative
[Termes IGN] antenne DORIS
[Termes IGN] co-positionnement
[Termes IGN] modèle météorologique
[Termes IGN] retard troposphérique zénithal
[Termes IGN] station permanenteRésumé : (auteur) The atmospheric parameters, zenith delays and gradients, obtained by the DORIS, GPS, VLBI, and numerical weather models, ECMWF and NCEP, are compared at five DORIS co-located sites during the 15 days of the CONT14 campaign from 2014-05-06 until 2014-05-20. Further examined are two different solutions of GPS, VLBI and NCEP: for GPS, a network solution comparable to the TIGA reprocessing analysis strategy and a precise point positioning solution, for VLBI, a least squares and a Kalman filtered and smoothed solution, and for NCEP two spatial resolutions, 0.5° and 1.0°, are tested. The different positions of the antenna reference points at co-location sites affect the atmospheric parameters and have to be considered prior to the comparison. We assess and discuss these differences, tropospheric ties, by comparing ray-traced atmospheric parameters obtained at the positions of the various antenna reference points. While ray-traced ZHD and ZWD at the co-located antennas significantly differ, the ray-traced gradients show only very small differences. Weather events can introduce larger disagreement between atmospheric parameters obtained at co-location sites. The various weather model solutions in general agree very well in providing tropospheric ties. The atmospheric parameters are compared using statistical methods, such as the mean difference and standard deviations with repect to a weighted mean value. While GPS and VLBI atmospheric parameters agree very well in general, the DORIS observations are in several cases not dense enough to achieve a comparable level of agreement. The estimated zenith delays from DORIS, however, are competitive with the other space geodetic techniques. If the DORIS observation geometry is insufficient for the estimation of an atmospheric gradient, less than three satellites observed during the definition interval, the DORIS atmospheric parameters degrade and show small quasi-periodic variations that correlate with the number of observations and in particular with the number of satellites. An increase in the DORIS constellation concerning more satellites and in general more observations is very likely to significantly improve the quality of DORIS derived atmospheric parameters. For the first time, we tested a 6 h sampling of the DORIS gradients. Where the observations are sufficiently dense, the increased sampling results in an improvement of the agreement of the DORIS gradients with the other solutions. Numéro de notice : A2016--184 Affiliation des auteurs : LASTIG LAREG+Ext (2012-mi2018) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2016.09.023 Date de publication en ligne : 29/09/2016 En ligne : https://doi.org/10.1016/j.asr.2016.09.023 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91819
in Advances in space research > vol 58 n° 12 (15 December 2016) . - pp 2758 - 2773[article]
Titre : Rénovation de la station DORIS de Saint-John's (Canada), version 1 Type de document : Rapport Auteurs : Jean-Claude Poyard, Auteur Mention d'édition : Version 1 Editeur : Saint-Mandé : Institut national de l'information géographique et forestière - IGN (2012-) Année de publication : 2014 Collection : Publications techniques en géodésie Sous-collection : Rapports techniques num. 28496 Importance : 17 p. Format : 21 x 30 cm Langues : Français (fre) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] antenne DORIS
[Termes IGN] Canada
[Termes IGN] station DORISRésumé : (auteur) Une mission de rénovation de la station DORIS située à l'observatoire magnétique de Saint-John's est planifiée courant juillet 2013. Le présent rapport décrit cette intervention et les résultats obtenus. Le rattachement effectué pendant cette mission fait l'objet d'un rapport spécifique. Note de contenu : 1. Contexte
2. Présentation du site
3. Etat des lieux
4. Installation
5. Position de la nouvelle antenne
6. Maintenance
7. AnnexesNuméro de notice : 19730 Affiliation des auteurs : IGN (2012-2019) Thématique : POSITIONNEMENT Nature : Rapport de mission nature-HAL : Rapport DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84068 Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 19730-01 7D Livre SGM K001 Exclu du prêt Documents numériques
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Titre : Rénovation de la station DORIS de Kourou (Guyane), version 1 Type de document : Rapport Auteurs : Jean-Claude Poyard, Auteur Mention d'édition : 1 Editeur : Paris : Institut Géographique National - IGN (1940-2007) Année de publication : 2011 Collection : Publications techniques en géodésie Sous-collection : Rapports techniques num. 28326 Importance : 22 p. Format : 21 x 30 cm Langues : Français (fre) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] antenne DORIS
[Termes IGN] Kourou
[Termes IGN] rattachement de station
[Termes IGN] station DORIS
[Termes IGN] station GNSSRésumé : (Auteur) La monumentation de l'antenne de la balise maitresse à la station Galliot (Kourou) est obsolète et ne répond plus aux exigences du système DORIS. Le présent rapport décrit la mission de rénovation DORIS planifiée en même temps que la mission d'installation d'une station GNSS REGINA. Le rattachement sera publié ultérieurement dans un rapport spécifique. Numéro de notice : 12777 Affiliation des auteurs : IGN (1940-2011) Thématique : POSITIONNEMENT Nature : Rapport de mission Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=40344 Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 12777-01 7D Livre SGM K001 Exclu du prêt PermalinkPermalinkPermalink
