@InProceedings{MoraesCoVaSaPaAfMo:2021:CoStMo,
author = "Moraes, A. O. and Costa, E. and Vani, B. C. and Salles, L. A. and
Paula, Eurico Rodrigues de and Affonso, B. J. and Monico, J. F.
G.",
affiliation = "{Instituto de Aeron{\'a}utica e Espa{\c{c}}o (IAE)} and
{Pontif{\'{\i}}cia Universidade Cat{\'o}lica do Rio de Janeiro
(PUC-Rio)} and Instituto Federal de Educa{\c{c}}{\~a}o,
Ci{\^e}ncia e Tecnologia de S{\~a}o Paulo (IFSP) and {Instituto
Tecnol{\'o}gico de Aeron{\'a}utica (ITA)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and Embraer and
{Universidade Estadual Paulista (UNESP)}",
title = "Contributions on the Statistical Modeling of Ionospheric
Scintillation in the Brazilian Region",
year = "2021",
organization = "Simp{\'o}sio Brasileiro de Geof{\'{\i}}sica Espacial e
Aeronomia, 8. (SBGEA)",
abstract = "Ionospheric scintillation is the term used to indicate amplitude
and phase variations of radio signals that propagate through
regions of low electronic density in the ionosphere (plasma
bubbles, populated by irregularities with a wide range of scale
sizes). This phenomenon occurs daily, especially in the years of
high solar activity, around the geomagnetic equator and low
latitude regions, during the summer solstice and after sunset,
affecting radio signal users. In particular, ionospheric
scintillation presents great liability to the performance of GPS
receivers. It is responsible for significant degradation in the
accuracy of position estimation. Rapid phase variations may be
interpreted as a Doppler shift in the GPS signal, resulting in a
loss of phase lock in severe cases. Furthermore, amplitude fades
can cause the signalto-noise ratio to drop below the threshold
required for receiver operation. Under extremes scintillation
scenarios, the receiver may lose lock of multiple channels and,
depending on its severity, a full interruption of the receiver
operation may occur. Because availability and integrity of GNSS
services may be drastically affected by scintillation, this work
analyzes GPS scintillation data recorded during the solar maximum
of cycle 24 in the Brazilian cities of Fortaleza, Presidente
Prudente, Sao Jos´e dos Campos and Porto Alegre. All these
stations are located near or around the southern crest of the
Equatorial Ionization Anomaly. The analysis has been performed
aiming at generating a series of models and approximations to
better characterize the occurrence of scintillation in Brazil. The
goal is to identify situations and understand the scenarios where
the worst scintillation cases occur. This assessment is intended
to support research regarding mitigation techniques and strategies
for augmentation systems operation under equatorial and low
latitude regions.",
conference-location = "Online",
conference-year = "22-26 mar.",
language = "en",
urlaccessdate = "09 maio 2024"
}