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Evaluation of Precise Point Positioning accuracy under large total electron content variations in equatorial latitudes / I. Rodriguez-Bilbao in Advances in space research, vol 55 n° 2 (January 2015)  

Public [article]  inAdvances in space research > vol 55 n° 2 (January 2015) . - pp 605 - 616 Titre : Evaluation of Precise Point Positioning accuracy under large total electron content variations in equatorial latitudes Type de document : Article/Communication Auteurs : I. Rodriguez-Bilbao, Auteur ; B. Moreno Monge, Auteur ; G. Rodriguez-Caderot, Auteur ; et al., Auteur Année de publication : 2015 Article en page(s) : pp 605 - 616 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes IGN] équateur (géodésie) [Termes IGN] estimation de précision [Termes IGN] positionnement ponctuel précis [Termes IGN] teneur totale en électrons Résumé : (auteur) The ionosphere is one of the largest contributors to errors in GNSS positioning. Although in Precise Point Positioning (PPP) the ionospheric delay is corrected to a first order through the ‘iono-free combination’, significant errors may still be observed when large electron density gradients are present. To confirm this phenomenon, the temporal behavior of intense fluctuations of total electron content (TEC) and PPP altitude accuracy at equatorial latitudes are analyzed during four years of different solar activity. For this purpose, equatorial plasma irregularities are identified with periods of high rate of change of TEC (ROT). The largest ROT values are observed from 19:00 to 01:00 LT, especially around magnetic equinoxes, although some differences exist between the stations depending on their location. Highest ROT values are observed in the American and African regions. In general, large ROT events are accompanied by frequent satellite signal losses and an increase in the PPP altitude error during years 2001, 2004 and 2011. A significant increase in the PPP altitude error RMS is observed in epochs of high ROT with respect to epochs of low ROT in years 2001, 2004 and 2011, reaching up to 0.26 m in the 19:00–01:00 LT period. Numéro de notice : A2015-298 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2014.11.004 En ligne : https://doi.org/10.1016/j.asr.2014.11.004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76462 [article]