Analysis of amplitude deep fades observed by a static GPS scintillation monitor located near the Equatorial Ionization Anomaly peak during high solar flux conditions

Details Analysis of amplitude deep fades observed by a static GPS scintillation monitor located near the Equatorial Ionization Anomaly peak during high solar flux conditions Analysis of amplitude deep fades observed by a static GPS scintillation monitor located near the Equatorial Ionization Anomaly peak during high solar flux conditions

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa21a1870p&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA21A-1870

Computer Science

Performance

[2439] Ionosphere / Ionospheric Irregularities

Scientific paper

Amplitude deep fades caused by ionospheric scintillation can break the carrier loop operation of a GPS receiver. As a consequence, the navigation availability and/or accuracy in the position determination can be reduced. In this work we analyzed 32 days (Dec. 14 2000 - Jan. 14 2001) of measurements of the GPS L1 (1.575 GHz) amplitude signal in order to investigate the occurrences of scintillation and deep fading events caused by low-latitude ionospheric irregularities. The observations were made during the last solar maximum by a GPS-based scintillation monitor (ScintMon) deployed in Sao Jose dos Campos, Brazil, located near the peak of the Equatorial Ionization Anomaly. The large number of observations provides the opportunity to investigate different scintillation scenarios, including extremely intense scintillation cases. We characterize the observed scintillation cases according to the amplitude scintillation index (S4) and the decorrelation time (tau0). The occurrence of amplitude deep fades is characterized by two parameters: fading depth and duration. The results of this analysis are presented and discussed. The implications of our results for GPS receiver performance are also discussed.

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