On the Geometrical Aspects of GPS Scintillations during the Conjugate Point Equatorial Experiment (copex) Campaign in Brazil

Details On the Geometrical Aspects of GPS Scintillations during the Conjugate Point Equatorial Experiment (copex) Campaign in Brazil On the Geometrical Aspects of GPS Scintillations during the Conjugate Point Equatorial Experiment (copex) Campaign in Brazil

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa23a1878c&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA23A-1878

Mathematics

Probability

[2415] Ionosphere / Equatorial Ionosphere, [2439] Ionosphere / Ionospheric Irregularities, [6964] Radio Science / Radio Wave Propagation

Scientific paper

We examine the geometrical aspects of GPS scintillations at three locations in Brazil during the Oct-Dec 2002 Conjugate Point Equatorial Experiment (COPEX): Boa Vista (2.85N, 60.70°W, dip 12.60°N); Alta Floresta (9.87°S, 56.1°W, dip 0.75°S); and Campo Grande (20.47°S, 54.66°W, dip 10.77°S). Previous authors [Muella et al., 2008; de Paula et al., 2010] have established the association between the GPS scintillations during the campaign and equatorial plasma bubbles generated by plasma interchange instabilities after sunset. Our aim is to demonstrate the effect of satellite motion and the direction of signal propagation with respect to the magnetic field on the depth and rate of signal fading, both of which affect the probability of scintillation-induced loss of lock on the GPS signals and degrade GPS positioning accuracy [Humphreys et al., 2010; Carrano et al., 2010]. We report on the behavior of the scintillation intensity index (S4) and the intensity decorrelation time (τ) as a function of dip latitude, local time, and the speed and direction at which the line of sight scans through the drifting plasma irregularities. We remove the geometrical effects using weak scatter diffraction theory to estimate the turbulent intensity and spatial decorrelation length in the magnetic west-east direction. From these parameters, it is possible to infer the depth and rate of signal fading for any propagation geometry in the region, a capability which is needed for modeling GPS scintillation impacts on GPS positioning accuracy.

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