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Author: search.filters.author.Leelaruji, NiphaSubject: search.filters.subject.Scintillation

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    Mitigate the GPS position error by neural network technique
    (2008-12-01)
    Nontasud, Sarawut
    ;
    Leelaruji, Nipha
    This paper presents the error reduction of GPS receiver due to ionospheric irregularities by neural network technique. Normally, when GPS signal passed through the irregularities of ionosphere the scintillation will be appeared. It causes to latitude and longitude error from reference position or pseudo-range error more than 10 meters. GPS position error depends on the strength of scintillation index or S4 which due to total electron content in the ionosphere (TEC).We used the measurement data which include the S4 index to analyze and correct the position error by neural network technique. The result of this research we found the position error can reduce to less than 1 meter. The positions average close to correct position. © 2008 SICE.
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    Applied the artificial neural network for reduce the position erroron GPS receiver due to ionospheric irregularities
    (2008-12-01)
    Nontasud, Sarawut
    ;
    Leelaruji, Nipha
    When the GPS signal pass through the ionosphere irregularities effect to rapid fluctuation of signal or scintillation occurred. This effect to the GPS receiver position error. This paper presents the error reduction of GPS receiver due to ionosphere irregularities by artificial neural network. The GPS position error depends on the strength of scintillation which measured in scintillation index or S4 index which due to total electron content (TEC) in the ionosphere. We used the measurement data which include the S4 index to analyze and correct the position error by artificial neural network. The result of this research we found the position error can reduce to less than 1 meter. The positions average close to correct position.© 2008 lEEE.
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    Observation of ionospheric height changes at chumphon near the magnetic equator
    (2005-12-01)
    Attaviriyasuwon, Rungchai
    ;
    Boonchuk, Thikumporn
    ;
    Leelaruji, Nipha
    ;
    Hemmakom, Narong
    This paper presents the ionospheric height variation for station near the magnetic equator at Chumphon campus, King Mongkut's Institute of Technology Ladkrabang which located at longitude 99.3 °E latitude 10.7 ° N. Ionogram was obtained every 15 minutes during equinox period. All data was used to determine apparent height (h'F) and critical frequency (fof2), respectively, by using data analysis of ionogram. This paper remains in predicting spread F onset base on the ionospheric height changes only. Although we have observations during a month, the height variation anomaly and we found that the spread F occurrences seem to be related to time of appearance. © 2005 IEEE.