Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/5943
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dc.contributor.authorallAquino, M.; Institute of Engineering Surveying and Space Geodesy (IESSG), University of Nottingham, Nottingham, UKen
dc.contributor.authorallMonico, J. F. G.; Department of Cartography, Sao Paulo State University, Pres. Prudente, São Paulo, SP, Brazilen
dc.contributor.authorallDodson, A. H.; Institute of Engineering Surveying and Space Geodesy (IESSG), University of Nottingham, Nottingham, UKen
dc.contributor.authorallMarques, H.; Department of Cartography, Sao Paulo State University, Pres. Prudente, São Paulo, SP, Brazilen
dc.contributor.authorallDe Franceschi, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.authorallAlfonsi, Lu.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.authorallRomano, V.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.authorallAndreotti, M.; Geospatial Research Center Ltd., Christchurch, New Zealanden
dc.date.accessioned2010-03-03T09:17:14Zen
dc.date.available2010-03-03T09:17:14Zen
dc.date.issued2009-03en
dc.identifier.urihttp://hdl.handle.net/2122/5943en
dc.description.abstractIonospheric scintillations are caused by timevarying electron density irregularities in the ionosphere, occurring more often at equatorial and high latitudes. This paper focuses exclusively on experiments undertaken in Europe, at geographic latitudes between ~50°N and ~80°N, where a network of GPS receivers capable of monitoring Total Electron Content and ionospheric scintillation parameters was deployed. The widely used ionospheric scintillation indices S4 and бφ represent a practical measure of the intensity of amplitude and phase scintillation affecting GNSS receivers. However, they do not provide sufficient information regarding the actual tracking errors that degrade GNSS receiver performance. Suitable receiver tracking models, sensitive to ionospheric scintillation, allow the computation of the variance of the output error of the receiver PLL (Phase Locked Loop) and DLL (Delay Locked Loop), which expresses the quality of the range measurements used by the receiver to calculate user position. The ability of such models of incorporating phase and amplitude scintillation effects into the variance of these tracking errors underpins our proposed method of applying relative weights to measurements from different satellites. That gives the least squares stochastic model used for position computation a more realistic representation, vis-a-vis the otherwise ‘equal weights’ model. For pseudorange processing, relative weights were computed, so that a ‘scintillation-mitigated’ solution could be performed and compared to the (non-mitigated) ‘equal weights’ solution. An improvement between 17 and 38% in height accuracy was achieved when an epoch by epoch differential solution was computed over baselines ranging from 1 to 750 km. The method was then compared with alternative approaches that can be used to improve the least squares stochastic model such as weighting according to satellite elevation angle and by the inverse of the square of the standard deviation of the code/carrier divergence (sigma CCDiv). The influence of multipath effects on the proposed mitigation approach is also discussed. With the use of high rate scintillation data in addition to the scintillation indices a carrier phase based mitigated solution was also implemented and compared with the conventional solution. During a period of occurrence of high phase scintillation it was observed that problems related to ambiguity resolution can be reduced by the use of the proposed mitigated solution.en
dc.language.isoengen
dc.publisher.nameSpringer-Verlagen
dc.relation.ispartofJournal of Geodesyen
dc.relation.ispartofseries10/83 (2009)en
dc.subjectGlobal navigation satellites systemen
dc.subjectGlobal positioning systemen
dc.subjectIonospheric scintillationen
dc.subjectReceiver tracking modelsen
dc.subjectMitigationen
dc.subjectStochastic modelen
dc.titleImproving the GNSS positioning stochastic model in the presence of ionospheric scintillationen
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber953-966en
dc.subject.INGV01. Atmosphere::01.02. Ionosphere::01.02.07. Scintillationsen
dc.subject.INGV05. General::05.07. Space and Planetary sciences::05.07.01. Solar-terrestrial interactionen
dc.subject.INGV05. General::05.07. Space and Planetary sciences::05.07.02. Space weatheren
dc.identifier.doi10.1007/s00190-009-0313-6en
dc.relation.referencesAarons J (1997) Global positioning system phase fluctuations at auroral latitudes. J Geophys Res 102(A8):17219–17232 Alves DBM, Monico JFG (2007) Modifying the stochastic model to mitigate GPS systematic errors in relative positioning. IAG Symposia (Springer), vol 130, Chapter 26, pp 166–171 AlfonsiL,De FranceschiG,RomanoV,AquinoMand DodsonA(2006) Positioning errors during the space weather event of October 2003. Location, ISSN 0973-4627, 1, issue 5 Aquino M, Rodrigues FS, Souter J, Moore T, Dodson A, Waugh S (2005) Ionospheric scintillation and impact on GNSS users in Northern Europe: results of a 3 year study. Space Commun 20(1/2):17–30 Aquino M, Moore T, Dodson A, Waugh S, Souter J, Rodrigues FS (2005) Implications of ionospheric scintillation for GNSS users in Northern Europe. J Navig 58(2):241–256 Aquino M, Monico JFG, Dodson A, Marques H (2006) Mitigating the effect of ionospheric scintillations on position estimates. In: online Proceedings of ESA 3rd European space weather week, Brussels, Belgium. http://sidc.oma.be/esww3 Aquino M, Dodson A, Souter J, Moore T (2007a) Ionospheric scintillation effects on GPS carrier phase positioning accuracy: analysis at Auroral and Sub-Auroral latitudes. IAG Symposia (Springer), vol 130, chapter 121, pp 859–866 Aquino M, Andreotti M, Dodson A, Strangeways H (2007) On the use of ionospheric scintillation indices as input to receiver tracking models. J Adv Space Res 40(3):426–435 Béniguel Y (2002) GISM, A Global Ionospheric Propagation Model for scintillations of transmitted signals. Radio Sci 37(3). doi:10. 1029/2000RS002393 Conker RS, El-Arini MB, Hegarty CJ, Hsiao T (2003) Modeling the effects of ionospheric scintillation on GPS/satellite-based augmentation system availability. Radio Sci 38(1):1001. doi:10.1029/ 2000RS002604 De Franceschi G, Alfonsi L, Romano V (2006) ISACCO: an Italian project to monitor the high latitudes ionosphere by means of GPS receivers. GPS Solut 10(4):263–267 De Franceschi G, Alfonsi L, Romano V, Aquino M, Dodson A, Mitchell C N, Wernik AW (2008) Dynamics of high latitude patches and associated small scale irregularities. J Atmos Solar-Terrestrial Phys 70:879–888. doi:10.1016/j.jastp.2007.05.018 GPS Silicon Valley (2004) GSV4004/GSV4004A GPS Ionospheric Scintillation and TEC Monitor (GISTM) User’s Manual Grejner-Brzezinska D,Wielgosz P,Kashani I, SmithDA,RobertsonDS, Mader GL, Komjathy A (2006) The impact of severe ionospheric conditions on the accuracy of kinematic position estimation: performance analysis of various ionospheric modeling techniques. Navigation 53(3):203–217 Kim BC, TininMV (2007) Contribution of ionospheric irregularities to the error of dual-frequency GNSS positioning. J Geod 81(3):189– 199 Moore T, Aquino M, Waugh S, Dodson A, Hill C (2002) Evaluation of the EGNOS ionospheric correction model under scintillation in Northern Europe. In: Proceedings of the 15th technical meeting of the satellite division of the Institute of Navigation: ION GPS 2002, Portland, Oregon, USA, pp 1297–1306 Rodrigues FS, Aquino M, Dodson A, Moore T,Waugh S (2004) Statistical analysis of GPS ionospheric scintillation and short-time TEC variations over Northern Europe. J Inst Navig 51(1):59–75 RomanoV, Pau S, Pezzopane M, Zuccheretti E, Zolesi B, De Franceschi G, Locatelli S (2007) The electronic space weather upper atmosphere (eSWua) project at INGV: advancements and state of the art. Ann Geophys 25:1–7 (in press) Skone S, Yousuf R, Coster A (2004) Performance evaluation of the Wide Area Augmentation System for ionospheric storm events. J Glob Position Syst 3(1–2):251–258 Souza EM, Monico JFG (2007) The wavelet method as an alternative for reducing ionospheric effects from L1 GPS receivers. J Geod 81(12):799–804 Strangeways HJ (2008) Determining scintillation effects onGPS receivers. In: Proceedings of the 12th international ionospheric effects symposium IES2008, Alexandria, Washington DC, USA, 13–15 May 2008, pp 550–557 Teunissen PJG (1996) GPS carrier phase ambiguity fixing concepts. In: Kleusberg A and Teunissen P (eds) GPS for Geodesy. Verlag, Berlin, pp 263–336 Van Dierendonck AJ, Klobuchar J, Hua Q (1993) Ionospheric scintillation monitoring using commercial single frequency C/A code receivers. In: Proceedings ION GPS-93: sixth international technical meeting of the satellite division of the Institute of Navigation, Salt Lake City, Utah, pp 1333–1342 Van Dierendonck AJ (2001) Measuring ionospheric scintillation effects from GPS signals. In: Proceedings of 57th annual meeting of the Institute of Navigation, Albuquerque, New Mexico, USA, pp 391– 396en
dc.description.obiettivoSpecifico1.7. Osservazioni di alta e media atmosferaen
dc.description.obiettivoSpecifico3.9. Fisica della magnetosfera, ionosfera e meteorologia spazialeen
dc.description.journalTypeJCR Journalen
dc.description.fulltextreserveden
dc.contributor.authorAquino, M.en
dc.contributor.authorMonico, J. F. G.en
dc.contributor.authorDodson, A. H.en
dc.contributor.authorMarques, H.en
dc.contributor.authorDe Franceschi, G.en
dc.contributor.authorAlfonsi, Lu.en
dc.contributor.authorRomano, V.en
dc.contributor.authorAndreotti, M.en
dc.contributor.departmentInstitute of Engineering Surveying and Space Geodesy (IESSG), University of Nottingham, Nottingham, UKen
dc.contributor.departmentDepartment of Cartography, Sao Paulo State University, Pres. Prudente, São Paulo, SP, Brazilen
dc.contributor.departmentInstitute of Engineering Surveying and Space Geodesy (IESSG), University of Nottingham, Nottingham, UKen
dc.contributor.departmentDepartment of Cartography, Sao Paulo State University, Pres. Prudente, São Paulo, SP, Brazilen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.departmentGeospatial Research Center Ltd., Christchurch, New Zealanden
item.fulltextWith Fulltext-
item.openairetypearticle-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.grantfulltextrestricted-
item.cerifentitytypePublications-
item.languageiso639-1en-
crisitem.author.deptInstitute of Engineering Surveying and Space Geodesy (IESSG), Nottingham, UK-
crisitem.author.deptInstitute of Engineering Surveying and Space Geodesy (IESSG) - University of Nottingham-
crisitem.author.deptDepartment of Cartography, Sao Paulo State University, Roberto Simonsen – 305, Presidente Prudente, SP, 19060-900, Brazil-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia-
crisitem.author.deptGeospatial Research Center Ltd., Christchurch, New Zealand-
crisitem.author.orcid0000-0002-3943-6798-
crisitem.author.orcid0000-0002-1806-9327-
crisitem.author.orcid0000-0002-7532-4507-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent01. Atmosphere-
crisitem.classification.parent05. General-
crisitem.classification.parent05. General-
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