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TitleGPS phase difference variation statistics: A comparison between phase scintillation index and proxy indices
AuthorGhoddousi-Fard, R; Prikryl, P; Lahaye, F
SourceAdvances in Space Research vol. 52, issue 8, 2013 p. 1397-1405,
Alt SeriesEarth Sciences Sector, Contribution Series 20130140
PublisherElsevier BV
Mediapaper; on-line; digital
File formatpdf
Subjectsgeophysics; remote sensing; satellite geodesy; global positioning system
Illustrationsgraphs; plots; tables
ProgramCanadian Spatial Reference System, Geodetic Survey
AbstractScintillated GPS phase observations are traditionally characterized by the phase scintillation index, derived from specialized GPS receivers usually tracking at 50 Hz. Geodetic quality GPS receivers, on the other hand, are normally tracking at frequencies up to 1 Hz. However, availability of continuously operating geodetic receivers both in time and geographical location are superior to scintillation receiver’s coverage in many parts of the world. This motivates scintillation studies using regional and global geodetic GPS networks. Previous studies have shown the usefulness of GPS estimated total electron content variations for detecting ionospheric irregularities. In this paper, collocated geodetic and scintillation receivers are employed to compare proxy indices derived from geodetic receivers with the phase scintillation index during quiet and moderately disturbed ionospheric conditions. Sensitivity of the phase scintillation indices at high latitude stations to geomagnetic activity is discussed. Global mapping of ionospheric disturbances using proxy indices from real-time 1 Hz GPS stations are also presented.
Summary(Plain Language Summary, not published)
Radio signals crossing small scale irregularities in the ionosphere may experience scintillation which causes rapid fluctuations in the amplitude and phase observed at the receiving antenna. Scintillation can significantly affect GNSS receivers tracking performance as well as satellites communication links. With densification of 1 Hz GPS receivers distributed globally and providing measurements in real-time or near-real-time, regional and global mapping of ionospheric irregularities is becoming a feasible practice for studies on climatology, nowcasting and forecasting of these irregularities. In this paper we examine statistics of 1 Hz phase difference variations at two GPS frequencies with respect to the phase scintillation index derived from 50 Hz measurements at a single GPS frequency.