@InProceedings{SallesVaSoSiMoMoPa:2021:TeFaCh,
               author = "Salles, L. A. and Vani, B. C. and Sousasantos, J. and Silva, A. L. 
                         A. and Moares, A. O. and Monico, J. F. G. and Paula, Eurico 
                         Rodrigues de",
          affiliation = "{Instituto Tecnol{\'o}gico de Aeron{\'a}utica (ITA)} and 
                         {Instituto Federal de S{\~a}o Paulo (IFSP)} and {Instituto 
                         Tecnol{\'o}gico de Aeron{\'a}utica (ITA)} and {Instituto 
                         Tecnol{\'o}gico de Aeron{\'a}utica (ITA)} and {Instituto de 
                         Aeron{\'a}utica e Espa{\c{c}}o (IAE)} and {Universidade Estadual 
                         Paulista (UNESP)} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)}",
                title = "Temporal fading characteristics at low latitude regions for GPS 
                         triple frequency users",
                 year = "2021",
         organization = "Simp{\'o}sio Brasileiro de Geof{\'{\i}}sica Espacial e 
                         Aeronomia, 8. (SBGEA)",
             abstract = "The ionospheric scintillation phenomenon has serious consequences 
                         on the communication systems. In particular, special attention has 
                         been given to GNSS systems with an emphasis on aeronautical 
                         applications. Scintillation causes attenuation in the amplitude 
                         and signal phase shifts, hence, its occurrence threaten the system 
                         operability, by causing loss of lock in the receiver, incorrect 
                         measurements that decreases the navigation performance and, in 
                         more severe cases, total loss of positioning. In the last decade, 
                         the GPS constellation has been modernized with the introduction of 
                         new codes/frequencies for more accurate operation through the L2C 
                         and L5 frequencies. The motivation for this modernization is the 
                         use of GPS for critical applications involving civil aviation and 
                         defense systems. The aim of this study is to perform a comparative 
                         analysis of the effects of ionospheric scintillation on GPS 
                         signals in order to characterize the fading effects on the 
                         received signal amplitude at the three frequencies, L1, L2C and 
                         L5. Data used in this analysis was collected by 50Hz scintillation 
                         monitors in four cities along the Brazilian territory: Fortaleza, 
                         Presidente Prudente, Sao Jos´e dos Campos and Porto Alegre. The 
                         analysis period was between November 2014 and March 2015, during 
                         the maximum solar activity of cycle 24. In the analysis, a 
                         particular focus was given to measure the frequency of occurrence 
                         and the typical duration of the fading events in the L2C and L5 
                         signals in comparison to the L1 (legacy signal). Three fading 
                         threshold were chosen -9 dB, -12 dB, and -15 dB. The number of 
                         fading events in all locations increased substantially, reaching 
                         up to 200% more occurrences in some cases. The results confirm 
                         previous works in the literature showing that L2C and L5 signals 
                         are more vulnerable to availability issues due to the occurrence 
                         of scintillation.",
  conference-location = "Online",
      conference-year = "22-26 mar.",
             language = "en",
        urlaccessdate = "04 jun. 2024"
}