@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 = "06 maio 2024"
}