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| Titel |
Analysis of strong scintillation events by using GPS data at low latitudes |
| VerfasserIn |
Biagio Forte, Norbert Jakowski, Volker Wilken |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250037375
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| Zusammenfassung |
| Drifting structures charaterised by inhomogeneities in the spatial electron density distribution
at ionospheric heights originate scintillation of radio waves propagating through. The
fractional electron density fluctuations and the corresponding scintillation levels may reach
extreme values at low latitudes during high solar activity.
Strong scintillation events have disruptive effects on a number of technological
applications. In particular, operations and services based on GPS signals and receivers may
experience severe disruption due to a significant degradation of the signal-to-noise ratio,
eventually leading to signal loss of lock.
Experimental scintillation data collected in the Asian sector at low latitudes by means of a
GPS dual frequency receiver under moderate solar activity (2006) have been analysed.
The GPS receiver is particularly modified in firmware in order to record power
estimates on the C/A code as well as on the carriers L1 and L2. Strong scintillation
activity is recorded in the post-sunset period (saturating S4 and SI as high as 20
dB).
An overview of these events is presented, by taking into account scintillation impact on
the signal intensity, phase, and dynamics. In particular, the interpretation of these events
based on a refined scattering theory is provided with possible consequences for standard
scintillation models. |
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