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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/70014
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dc.contributor.authorAquino, M.-
dc.contributor.authorDodson, A.-
dc.contributor.authorDeFranceschi, G.-
dc.contributor.authorAlfonsi, L.-
dc.contributor.authorRomano, V.-
dc.contributor.authorMonico, J. F G-
dc.contributor.authorMarques, H.-
dc.contributor.authorMitchell, C.-
dc.date.accessioned2014-05-27T11:22:39Z-
dc.date.accessioned2016-10-25T18:24:36Z-
dc.date.available2014-05-27T11:22:39Z-
dc.date.available2016-10-25T18:24:36Z-
dc.date.issued2007-12-01-
dc.identifierhttp://dx.doi.org/10.1109/ELMAR.2007.4418801-
dc.identifier.citationProceedings Elmar - International Symposium Electronics in Marine, p. 63-67.-
dc.identifier.issn1334-2630-
dc.identifier.urihttp://hdl.handle.net/11449/70014-
dc.identifier.urihttp://acervodigital.unesp.br/handle/11449/70014-
dc.description.abstractThe effect of the ionosphere on the signals of Global Navigation Satellite Systems (GNSS), such as the Global Positionig System (GPS) and the proposed European Galileo, is dependent on the ionospheric electron density, given by its Total Electron Content (TEC). Ionospheric time-varying density irregularities may cause scintillations, which are fluctuations in phase and amplitude of the signals. Scintillations occur more often at equatorial and high latitudes. They can degrade navigation and positioning accuracy and may cause loss of signal tracking, disrupting safety-critical applications, such as marine navigation and civil aviation. This paper addresses the results of initial research carried out on two fronts that are relevant to GNSS users if they are to counter ionospheric scintillations, i.e. forecasting and mitigating their effects. On the forecasting front, the dynamics of scintillation occurrence were analysed during the severe ionospheric storm that took place on the evening of 30 October 2003, using data from a network of GPS Ionospheric Scintillation and TEC Monitor (GISTM) receivers set up in Northern Europe. Previous results [1] indicated that GPS scintillations in that region can originate from ionospheric plasma structures from the American sector. In this paper we describe experiments that enabled confirmation of those findings. On the mitigation front we used the variance of the output error of the GPS receiver DLL (Delay Locked Loop) to modify the least squares stochastic model applied by an ordinary receiver to compute position. This error was modelled according to [2], as a function of the S4 amplitude scintillation index measured by the GISTM receivers. An improvement of up to 21% in relative positioning accuracy was achieved with this technnique.en
dc.format.extent63-67-
dc.language.isoeng-
dc.sourceScopus-
dc.subjectGalileo-
dc.subjectGNSS-
dc.subjectGPS-
dc.subjectIonosphere-
dc.subjectIonospheric scintillation-
dc.subjectTotal Electron Content (TEC)-
dc.subjectAtmospheric electricity-
dc.subjectCurve fitting-
dc.subjectError analysis-
dc.subjectForecasting-
dc.subjectGlobal positioning system-
dc.subjectIonospheric measurement-
dc.subjectLeast squares approximations-
dc.subjectLight emission-
dc.subjectLuminescence-
dc.subjectMarine applications-
dc.subjectMathematical models-
dc.subjectNavigation-
dc.subjectResearch-
dc.subjectSatellite navigation aids-
dc.subjectStochastic models-
dc.subjectAmplitude scintillation index-
dc.subjectDelay-locked loop (DLL)-
dc.subjectDensity irregularities-
dc.subjectEuropean-
dc.subjectGalileo (CO)-
dc.subjectGlobal navigation satellite systems (GLONASS)-
dc.subjectGPS receivers-
dc.subjectHigh Latitudes-
dc.subjectIn phase (IP)-
dc.subjectInternational symposium-
dc.subjectIonospheric electron-
dc.subjectIonospheric plasmas-
dc.subjectIonospheric scintillations-
dc.subjectIonospheric storm-
dc.subjectLeast squares (LS)-
dc.subjectLoss of signal-
dc.subjectMarine navigation-
dc.subjectMobile multimedia-
dc.subjectMonitor (CO)-
dc.subjectNavigation and positioning-
dc.subjectOutput error (OE)-
dc.subjectPaper addresses-
dc.subjectRelative positioning-
dc.subjectSafety critical applications-
dc.subjectTime-varying-
dc.subjectTotal electron content (TEC)-
dc.subjectScintillation-
dc.titleTowards forecasting and mitigating ionospheric scintillation effects on GNSSen
dc.typeoutro-
dc.contributor.institutionUniversity of Nottingham-
dc.contributor.institutionNational Institute for Geophysics and Volcanology (INGV)-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.contributor.institutionUniversity of Bath-
dc.description.affiliationInstitute of Engineering Surveying and Space Geodesy University of Nottingham, University Park, Nottingham, NG7 2RD-
dc.description.affiliationNational Institute for Geophysics and Volcanology (INGV), Via di Vigna Murata 605, Rome, 00143-
dc.description.affiliationDepartment of Cartography Sao Paulo State University (UNESP) at Presidente Prudente, 19060-900, Sao Paulo-
dc.description.affiliationDepartment of Electronic and Electrical Engineering University of Bath, Bath, BA2 7AY-
dc.description.affiliationUnespDepartment of Cartography Sao Paulo State University (UNESP) at Presidente Prudente, 19060-900, Sao Paulo-
dc.identifier.doi10.1109/ELMAR.2007.4418801-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofProceedings Elmar - International Symposium Electronics in Marine-
dc.identifier.scopus2-s2.0-47349089389-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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