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Ionospheric corrections tailored to the Galileo High Accuracy Service / Adria Rovira-Garcia in Journal of geodesy, vol 95 n° 12 (December 2021)  

Public [article]  inJournal of geodesy > vol 95 n° 12 (December 2021) . - n° 130 Titre : Ionospheric corrections tailored to the Galileo High Accuracy Service Type de document : Article/Communication Auteurs : Adria Rovira-Garcia, Auteur ; C.C. Timoté, Auteur ; José Miguel Juan, Auteur ; et al., Auteur Année de publication : 2021 Article en page(s) : n° 130 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] correction ionosphérique [Termes IGN] décalage d'horloge [Termes IGN] erreur systématique interfréquence d'horloge [Termes IGN] GalileoSat [Termes IGN] mesurage de phase [Termes IGN] modèle ionosphérique [Termes IGN] positionnement par Galileo [Termes IGN] positionnement ponctuel précis [Termes IGN] résolution d'ambiguïté [Termes IGN] retard ionosphèrique Résumé : (auteur) The Galileo High Accuracy Service (HAS) is a new capability of the European Global Navigation Satellite System that is currently under development. The Galileo HAS will start providing satellite orbit and clock corrections (i.e. non-dispersive effects) and soon it will also correct dispersive effects such as inter-frequency biases and, in its full capability, ionospheric delay. We analyse here an ionospheric correction system based on the fast precise point positioning (Fast-PPP) and its potential application to the Galileo HAS. The aim of this contribution is to present some recent upgrades to the Fast-PPP model, with the emphasis on the model geometry and the data used. The results show the benefits of integer ambiguity resolution to obtain unambiguous carrier phase measurements as input to compute the Fast-PPP model. Seven permanent stations are used to assess the errors of the Fast-PPP ionospheric corrections, with baseline distances ranging from 100 to 1000 km from the reference receivers used to compute the Fast-PPP corrections. The 99% of the GPS and Galileo errors in well-sounded areas and in mid-latitude stations are below one total electron content unit. In addition, large errors are bounded by the error prediction of the Fast-PPP model, in the form of the variance of the estimation of the ionospheric corrections. Therefore, we conclude that Fast-PPP is able to provide ionospheric corrections with the required ionospheric accuracy, and realistic confidence bounds, for the Galileo HAS. Numéro de notice : A2021-854 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-021-01581-x Date de publication en ligne : 21/11/2021 En ligne : https://doi.org/10.1007/s00190-021-01581-x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=99059 [article]

Assessing the latest performance of Galileo-only PPP and the contribution of Galileo to Multi-GNSS PPP / Fengyu Xiu in Advances in space research, vol 63 n° 9 (1 May 2019)  

Public [article]  inAdvances in space research > vol 63 n° 9 (1 May 2019) . - pp 2784 - 2795 Titre : Assessing the latest performance of Galileo-only PPP and the contribution of Galileo to Multi-GNSS PPP Type de document : Article/Communication Auteurs : Fengyu Xiu, Auteur ; Shirong Ye, Auteur ; Pengfei Xia, Auteur ; Lewen Zhao, Auteur ; et al., Auteur Année de publication : 2019 Article en page(s) : pp 2784 - 2795 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] constellation Galileo [Termes IGN] erreur systématique inter-systèmes [Termes IGN] GalileoSat [Termes IGN] positionnement cinématique [Termes IGN] positionnement par Galileo [Termes IGN] positionnement par GLONASS [Termes IGN] positionnement par GPS [Termes IGN] positionnement ponctuel précis [Termes IGN] précision du positionnement [Termes IGN] résidu [Termes IGN] trajet multiple [Vedettes matières IGN] Traitement de données GNSS Résumé : (auteur) By the end of 2016, the Galileo constellation had 4 in-orbit validation (IOV) satellites and 14 full operational capability (FOC) satellites, 17 of which were able to transmit signal in November 2017. Galileo has already had early operational capability (EOC). To assess the latest performance of the Galileo-only precise point positioning (PPP) and the contribution of Galileo to the Multi-GNSS PPP solutions, observations collected at 16 Multi-GNSS Experiment (MGEX) stations over ten days are used to realize the various PPP cases. The statistical results show that the three-dimensional positioning accuracy of Galileo static and kinematic PPP can reach centimeter level and decimeter level after convergence, respectively. The contribution of Galileo can improve the positioning accuracy by 29.49%, 29.96% and 23.70% for GPS kinematic PPP and 11.03%, 10.59% and 11.07% for GPS/GLONASS kinematic PPP solutions in the north, east and up components, respectively. The average convergence time can be reduced by 45.48% for GPS-only kinematic PPP and by 11.04% for GPS/GLONASS solutions by adding Galileo observations. Moreover, adding Galileo observations shortens the average convergence time by 30.45% and 7.8% for GPS-only and GPS/GLONASS static PPP solutions, respectively. Although the convergent positioning results of GPS and GPS/GLONASS static PPP solutions after the addition of Galileo measurements do not demonstrate as significant improvement as those of the kinematic PPP solutions, the positioning accuracy of the GPS/Galileo static PPP solutions compared to the GPS-only static PPP still demonstrates an improvement of approximately 25% on the east component. Furthermore, the GPS/Galileo internal system time bias (ISB) and observation residual are analyzed. The results show that the noise level of the GPS L1/L2 signals and the negative impact of multipath errors on the GPS pseudo-range observations for the L1/L2 signals are greater than those of Galileo E1/E5a signals, resulting in the residuals of GPS ionosphere-free code observations larger than those of Galileo code observations. However, the phase observation residuals of GPS and Galileo are of the same magnitude. Additionally, the one-day GPS/Galileo ISB is quite stable. Its stability described by standard deviation is approximately 0.34 ns. Numéro de notice : A2019-397 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2018.06.008 Date de publication en ligne : 28/06/2019 En ligne : https://doi.org/10.1016/j.asr.2018.06.008 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93508 [article]

Contracts and promising test results: update Galileo, EGNOS, Glonass and GPS / Huibert-Jan Lekkerkerk in Geoinformatics, vol 9 n° 1 (01/01/2006)

Public [article]  inGeoinformatics > vol 9 n° 1 (01/01/2006) . - pp 18 - 19 Titre : Contracts and promising test results: update Galileo, EGNOS, Glonass and GPS Type de document : Article/Communication Auteurs : Huibert-Jan Lekkerkerk, Auteur Année de publication : 2006 Article en page(s) : pp 18 - 19 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] European Geostationary Navigation Overlay Service [Termes IGN] GalileoSat [Termes IGN] Global Navigation Satellite System [Termes IGN] Global Orbitography Navigation Satellite System [Termes IGN] Global Positioning System [Termes IGN] satellite artificiel [Termes IGN] système de positionnement par satellites Résumé : (Auteur) A lot of effort is being put in the development of Global Satellite Navigation Systems (GNSS). First of all there is the European Geostationary navigation overlay System (EGNOS), a differential GPS of Space Based Augmentation System (SBAS) based upon geo-stationary satellites. Furthermore Galileo is under full development as a European counterpart to GPS. Finally the development of GLONASS and GPS is continuing. This article describes the current state of GNSS. In the future you will find regular updates in this magazine concerning GNSS. Numéro de notice : A2006-047 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27774 [article]

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262-06011	SL	Revue	Centre de documentation	Revues en salle	Disponible

Galileo test user segment: first achievements and application / M. Hollreiser in GPS world, vol 16 n° 7 (July 2005)

Public [article]  inGPS world > vol 16 n° 7 (July 2005) . - pp 23 - 29 Titre : Galileo test user segment: first achievements and application Type de document : Article/Communication Auteurs : M. Hollreiser, Auteur ; Jean-Marie Sleewaegen, Auteur ; W. De Wilde, Auteur ; et al., Auteur Année de publication : 2005 Article en page(s) : pp 23 - 29 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] Galileo [Termes IGN] GalileoSat [Termes IGN] récepteur Galileo [Termes IGN] secteur terrien [Termes IGN] test de performance Résumé : (Auteur) This article addresses the scope and requirements of the Galileo system's Test User Segment, summarizing the first development results, including performance tests, and giving an overview of Galileo System Test Bed (GSTB)-V2 activities. The first Galileo satellites, testbeds GSTB-V2/A and GSTB-V2/B, should launch at the end of this year. Numéro de notice : A2005-285 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27421 [article]

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
067-05071	SL	Revue	Centre de documentation	Revues en salle	Disponible

Launching Galileo / O. Onidi in Galileo's world, vol 4 n° 2 (01/09/2002)

Public [article]  inGalileo's world > vol 4 n° 2 (01/09/2002) . - pp 16 - 19 Titre : Launching Galileo Type de document : Article/Communication Auteurs : O. Onidi, Auteur Année de publication : 2002 Article en page(s) : pp 16 - 19 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] financement [Termes IGN] GalileoSat [Termes IGN] implémentation (informatique) [Termes IGN] navigation aérienne [Termes IGN] navigation automobile Résumé : (Auteur) The European Commission and the European Space Agency have released 1,1 billion euros in public funds for development of Galileo and established a joint undertaking to manage the development phase and prepare the deployement phase. This article describes the planning, the various service levels that Galileo will provide, and the issues of global interoperability. Numéro de notice : A2002-253 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22164 [article]

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15355-01	30.61	Revue	Centre de documentation	Géodésie	Disponible

Quo vadis, Galileo / V. Ashkenazi in Galileo's world, vol 4 n° 2 (01/09/2002)

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Real-time kinematic in the light of GPS modernisation and Galileo / B. Eisfeller in Galileo's world, vol 4 n° 2 (01/09/2002)

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Galileo sat: system architecture and performance results / S. Greco in Galileo's world, vol 3 n° 3 (01/09/2001)

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