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| Titel |
Effect of solar radio bursts on GNSS signal reception over Europe for the period 1999-2013 |
| VerfasserIn |
Jean-Marie Chevalier, Nicolas Bergeot, Christophe Marqué, Wim Aerts, Carine Bruyninx |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250111056
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| Publikation (Nr.) |
 EGU/EGU2015-11119.pdf |
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| Zusammenfassung |
| Intense solar radio bursts (SRB) emitted at L-band frequencies can affect the carrier-to-noise
C/N0 ratio of Global Navigation Satellite Systems (GNSS) signals by increasing the
background noise. Such space weather events can consequently decrease the quality of
GNSS-based results especially for kinematic high-precision positioning. It is thus
important to develop a method capable to detect such events in near real time on a wide
area.
For this purpose, the ROB-IONO software was adapted for analysing the effect of SRB on
the dense EUREF Permanent GNSS Network (EPN). First, S1 and S2 raw data extracted
from RINEX files were converted into the C/N0 unit (dB.Hz) taking into account
manufacturer corrections. Then, the differences (δC/N0) between all these C/N0observables
and their medians of the 7 previous satellite ground track repeat cycles, i.e. their normal quiet
state, were computed. The mean of all these well-calibrated δC/N0values from different
GNSS receivers and satellites offer at each epoch a reliable metric to detect and quantify the
impact of a SRB.
We investigated the degradation of GPS and GLONASS C/N0 on the entire EPN during
10 intense SRBs occurring at daylight over Europe between 1999 and 2013. The analysis
shows that: (1) GPS and GLONASS δC/N0 agree at the 0.1±0.2dB.Hz level; (2)
The standard deviation of the mean δC/N0of the EPN GNSS receivers is below
1dB.Hz 96% of the time, and below 0.6dB.Hz 76% of the time; (3) maximum δC/N0
degradation occurs at the epoch of maximum solar peak flux delivered by the solar ground
observatories; (4) C/N0 degradation becomes larger with increasing solar zenithal
angle.
Consequently, the ROB-IONO software is capable to detect the degradation of GNSS
signal reception over Europe due to SRBs. In addition, by taking advantage of the increasing
number of EPN stations delivering C/N0 data since 2005, even less intense SRB events can
now be detected. Finally, the developed method can be completely applied in near real time. |
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