author = "Moraes, Alison de Oliveira and Muella, Marcio T. A. H. and Paula, 
                         Eurico Rodrigues de and Oliveira, C{\'e}sar B. A. de and Terra, 
                         William P. and Perrella, Waldecir J. and Meibach-Rosa, P{\^a}mela 
                         R. P.",
          affiliation = "{Instituto de Aeron{\'a}utica e Espa{\c{c}}o (IAE)} and 
                         {Universidade do Vale do Para{\'{\i}}ba (UNIVAP)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Tecnol{\'o}gico de Aeron{\'a}utica (ITA)} and EMBRAER and 
                         {Instituto Tecnol{\'o}gico de Aeron{\'a}utica (ITA)} and 
                         {Universidade do Vale do Para{\'{\i}}ba (UNIVAP)}",
                title = "Statistical evaluation of GLONASS amplitude scintillation over low 
                         latitudes in the Brazilian territory",
              journal = "Advances in Space Research",
                 year = "2018",
               volume = "61",
               number = "7",
                pages = "1776--1789",
                month = "Apr.",
             keywords = "Ionospheric scintillation, GNSS availability.",
             abstract = "The ionospheric scintillation, generated by the ionospheric plasma 
                         irregularities, affects the radio signals that pass through it. 
                         Their effects are widely studied in the literature with two 
                         different approaches. The first one deals with the use of radio 
                         signals to study and understand the morphology of this phenomenon, 
                         while the second one seeks to understand and model how much this 
                         phenomenon interferes in the radio signals and consequently in the 
                         services to which these systems work. The interest of several 
                         areas, particularly to those that are life critical, has increased 
                         using the concept of satellite multi-constellation, which consists 
                         of receiving, processing and using data from different navigation 
                         and positioning systems. Although there is a vast literature 
                         analyzing the effects of ionospheric scintillation on satellite 
                         navigation systems, the number of studies using signals received 
                         from the Russian satellite positioning system (named GLONASS) is 
                         still very rare. This work presents for the first time in the 
                         Brazilian low-latitude sector a statistical analysis of 
                         ionospheric scintillation data for all levels of magnetic 
                         activities obtained by a set of scintillation monitors that 
                         receive signals from the GLONASS system. In this study, data 
                         collected from four stations were used in the analysis; Fortaleza, 
                         Presidente Prudente, Sao JoseŽ dos Campos and Porto Alegre. The 
                         GLONASS L-band signals were analyzed for the period from December 
                         21, 2012 to June 20, 2016, which includes the peak of the solar 
                         cycle 24 that occurred in 2014. The main characteristics of 
                         scintillation presented in this study include: (1) the statistical 
                         evaluation of seasonal and solar activity, showing the chances 
                         that an user on similar geophysical conditions may be susceptible 
                         to the effects of ionospheric scintillation; (2) a temporal 
                         analysis based on the local time distribution of scintillation at 
                         different seasons and intensity levels; and (3) the evaluation of 
                         number of simultaneously affected channels and its effects on the 
                         dilution of precision (DOP) for GNSS users are also presented in 
                         order to alert the timetables in which navigation will be most 
                         susceptible to such effects, as well as statistics on 
                         simultaneously affected channels. Relevant results about these 
                         statistical characteristics of scintillation are presented and 
                         analyzed providing relevant information about availability of a 
                         navigation system.",
                  doi = "10.1016/j.asr.2017.09.032",
                  url = "http://dx.doi.org/10.1016/j.asr.2017.09.032",
                 issn = "0273-1177 and 1879-1948",
             language = "en",
           targetfile = "Moraes_statistical.pdf",
        urlaccessdate = "14 abr. 2021"