@InProceedings{Becker-GuedesCarCamMonCan:2017:GNDeIo,
author = "Becker-Guedes, F{\'a}bio and Carmo, Carolina de Sousa do and
Camargo, Paulo O. and Monico, Jo{\~a}o F. Galera and Candido,
Cl{\'a}udia Maria Nicoli",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Universidade Estadual
Paulista (UNESP)} and {Universidade Estadual Paulista (UNESP)} and
{Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "GNSS derived ionospheric TEC observed through different TEC
calibration techniques in the brazilian sector",
booktitle = "Proceedings...",
year = "2017",
organization = "AGU Fall Meeting",
abstract = "Global Navigation Satellite System (GNSS) is becoming a reliable
tool for use in air navigation systems. Its use as the main
technology for determination of airplanes positioning has various
economic and logistic benefits but it depends strongly on the
ionospheric layer influences. The Brazilian sector ionosphere,
mainly over the equatorial ionization anomaly (EIA), presents
remarkable errors in the GNSS signal as compared to North America
and Europe. In order to study the total electron content
latitudinal variation of the Brazilian ionosphere we used a pair
of GNSS receivers on the ground, one located in the equatorial
region (Sao Luis) and other in the southern crest of the EIA
(Cachoeira Paulista), to collect the GNSS observables and
calculate the vertical TEC using different methods that has proven
to work well to describe the ionospheric behavior in the North
America and in Europe. We compared this results with a modified
Nagoya TEC calculation method used by the EMBRACE (Estudo e
Monitoramento BRAsileiro do Clima Espacial - Brazilian Study and
Monitoring of Space Weather) program. This work intends to follow
the performance of different TEC tuning methods to evaluate the
spurious effects of the ionospheric EIA gradients in the TEC
determination under typical conditions of the low-latitudes
ionosphere in the Brazilian sector. The calculated TEC under
different solar cycle conditions, geomagnetic activity, and
seasonal variations show deviations in the performance of each
method and stress the importance of well adjust the GNSS
observations to local conditions in order to optimize the TEC
evaluation. This study contributes to a better understanding of
local GNSS signal errors in the global intent of offering
conditions to improve the accuracy, integrity, availability, and
continuity requirements for the use of GNSS for air navigation in
South America.",
conference-location = "New Orleans",
conference-year = "11-15 Dec.",
language = "en",
targetfile = "becker_gnss.pdf",
urlaccessdate = "13 maio 2024"
}