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| Titel |
Geomagnetic storm effects on GPS based navigation |
| VerfasserIn |
P. V. S. Rama Rao, S. Gopi Krishna, J. Vara Prasad, S. N. V. S. Prasad, D. S. V. V. D. Prasad, K. Niranjan |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 27, no. 5 ; Nr. 27, no. 5 (2009-05-07), S.2101-2110 |
| Datensatznummer |
250016528
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| Publikation (Nr.) |
 copernicus.org/angeo-27-2101-2009.pdf |
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| Zusammenfassung |
The energetic events on the sun, solar wind and subsequent effects
on the Earth's geomagnetic field and upper atmosphere (ionosphere)
comprise space weather. Modern navigation systems that use
radio-wave signals, reflecting from or propagating through the
ionosphere as a means of determining range or distance, are
vulnerable to a variety of effects that can degrade the performance
of the navigational systems. In particular, the Global Positioning
System (GPS) that uses a constellation of earth orbiting satellites
are affected due to the space weather phenomena.
Studies made during two successive geomagnetic storms that occurred
during the period from 8 to 12 November 2004, have clearly revealed
the adverse affects on the GPS range delay as inferred from the
Total Electron Content (TEC) measurements made from a chain of seven
dual frequency GPS receivers installed in the Indian sector.
Significant increases in TEC at the Equatorial Ionization anomaly
crest region are observed, resulting in increased range delay during
the periods of the storm activity. Further, the storm time rapid
changes occurring in TEC resulted in a number of phase slips in the
GPS signal compared to those on quiet days. These phase slips often
result in the loss of lock of the GPS receivers, similar to those
that occur during strong(>10 dB) L-band scintillation events,
adversely affecting the GPS based navigation. |
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