@InProceedings{PaulaMoVaSoAbMo:2017:TeSpCh,
               author = "Paula, Eurico Rodrigues de and Moraes, Alison de Oliveira and 
                         Vani, Bruno Cesar and Sobral, Jos{\'e} Humberto Andrade and Abdu, 
                         Mangalathayil Ali and Monico, Jo{\~a}o Francisco Galera",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         de Aeron{\'a}utica e Espa{\c{c}}o (IAE)} and {Universidade 
                         Estadual Paulista (UNESP)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)} and {Universidade Estadual Paulista (UNESP)}",
                title = "Temporal and spatial characterization of GPS fading from 
                         ionospheric irregularities under low latitude",
            booktitle = "Proceedings...",
                 year = "2017",
         organization = "AGU Fall Meeting",
             abstract = "The ionosphere over the peak of the anomaly represents a treat for 
                         navigation systems based on GNSS. Brazilian territory is mostly 
                         under this harsh layer for satellite communication in general and 
                         in particular for navigation, like GPS users, where their 
                         receivers tracking performance are damaged under scintillation 
                         conditions. Ionospheric scintillation is responsible for 
                         significant degradation in the accuracy of navigation and 
                         positioning. Phase shifts accompanied by amplitude fades 
                         significantly degrades the signal-to-noise ratio of the received 
                         signal disrupting the channel and loosing navigation performance. 
                         The stronger the scintillations are, more difficulty will be for 
                         the GNSS receiver tracking loops to recover the phase and code 
                         replicas. These phenomena under specific geophysical conditions 
                         may severely affect the system availability and positioning. In 
                         this work the temporal characteristics of amplitude scintillation 
                         will be analyzed at the three available GPS frequencies, L1, L2C 
                         and L5. Aspect like fading duration and depth will be evaluated 
                         and compared among the three available frequencies for the current 
                         solar cycle. This work will use GPS scintillation data recorded 
                         during six months of data during 2014 to 2015 at three stations 
                         under Brazilian territory located near the southern crest of the 
                         equatorial ionization anomaly. The analysis will be performed 
                         focusing on the fading profile of the three frequencies comparing 
                         how the fading of those signals behave statistically between them. 
                         Aspects like loss of lock, spatial orientation between the signal 
                         across the ionospheric irregularity will also be discussed showing 
                         how much more susceptible the new frequencies might be in 
                         comparison to the widely used and studied L1 frequency.",
  conference-location = "New Orleans",
      conference-year = "11-15 Dec.",
             language = "en",
           targetfile = "paula_temporal.pdf",
        urlaccessdate = "27 abr. 2024"
}