@Article{SilvaYamaKugaCele:2012:AsIoTr,
               author = "Silva, Aurea Aparecida da and Yamaguti, Wilson and Kuga, Helio 
                         Koiti and Celestino, Cl{\'a}udia Celeste",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and Centro de Engenharia Modelagem e 
                         Ci{\^e}ncias Sociais Aplicadas (CECS), Universidade Federal Do 
                         ABC (UFABC), 09210-170 Santo Andr{\'e}, SP, Brazil",
                title = "Assessment of the Ionospheric and Tropospheric Effects in Location 
                         Errors of Data Collection Platforms in Equatorial Region during 
                         High and Low Solar Activity Periods",
              journal = "Mathematical Problems in Engineering",
                 year = "2012",
               volume = "2012",
               number = "Article ID 734280",
                pages = "1--15",
             keywords = "Atmospheric effects, Climatic data, Data collection, Environmental 
                         data, Equatorial regions, Geographical locations, Ionospheric 
                         effects, Location errors, National climatic data centers, Signal 
                         propagation, Signal propagation delays, Solar activity, 
                         Transmission delays, Tropospheric delays.",
             abstract = "The geographical locations of data collection platforms (DCP) in 
                         the Brazilian Environmental Data Collection System are obtained by 
                         processing Doppler shift measurements between satellites and DCP. 
                         When the signals travel from a DCP to a satellite crossing the 
                         terrestrial atmosphere, they are affected by the atmosphere 
                         layers, which generate a delay in the signal propagation, and 
                         cause errors in its final location coordinates computation. The 
                         signal propagation delay due to the atmospheric effects consists, 
                         essentially, of the ionospheric and tropospheric effects. This 
                         work provides an assessment of ionospheric effects using IRI and 
                         IONEX models and tropospheric delay compensation using climatic 
                         data provided by National Climatic Data Center. Two selected DCPs 
                         were used in this study in conjunction with SCD-2 satellite during 
                         high and low solar activity periods. Results show that the 
                         ionospheric effects on transmission delays are significant (about 
                         hundreds of meters) in equatorial region and should be considered 
                         to reduce DCP location errors, mainly in high solar activity 
                         periods, while in those due to tropospheric effects the zenith 
                         errors are about threemeters. Therefore it is shown that the 
                         platform location errors can be reduced when the ionospheric and 
                         tropospheric effects are properly considered.",
                  doi = "10.1155/2012/734280",
                  url = "http://dx.doi.org/10.1155/2012/734280",
                 issn = "1024-123X and 1563-5147",
                label = "lattes: 0342166996730444 1 SilvaYamaKugaCele:2012:AsIoTr",
             language = "en",
           targetfile = "734280.pdf",
        urlaccessdate = "16 jun. 2024"
}