@InProceedings{AlvesMoniShimSapu:2010:DeAvGp,
               author = "Alves, D B and Monico, J F and Shimabukuro, M and Sapucci, Luiz 
                         Fernando",
          affiliation = "FCT/UNESP, Presidente Prudente, Brazil and FCT/UNESP, Presidente 
                         Prudente, Brazil and FCT/UNESP, Presidente Prudente, Brazil and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "Development and availability of a gps network-based positioning in 
                         Brazil",
            booktitle = "Proceedings...",
                 year = "2010",
         organization = "The Meeting of the Americas.",
            publisher = "AGU",
             keywords = "satellite geodesy.",
             abstract = "Nowadays, the existence of real time GNSS network has become a 
                         reality in several countries. In Brazil, there is available the 
                         RBMC (Rede Brasileira de Monitoramento Cont{\'{\i}}nuo - 
                         Continuous Monitoring Brazilian Network; 
                         http://www.ibge.gov.br/english/geociencias/geodesia/rbmc/rbmc.shtm?c=7. 
                         However, given the actual reference station spacing, 
                         high-precision network-based positioning cannot be applied. In 
                         order to reduce this limitation, users in S{\~a}o Paulo State 
                         have the option of using data from the SP/Network (GNSS Active 
                         Network of S{\~a}o Paulo State). The main objectives of this 
                         network are to increase the number of GNSS active stations in 
                         S{\~a}o Paulo State and support researches concerning 
                         network-based positioning and related fields. The data are 
                         available in real time through the Internet using the NTRIP 
                         (Networked Transport of RTCM via Internet Protocol) protocol. In 
                         this paper it will be presented aspects related to the development 
                         and results obtained with an in-house software that has been 
                         developed at FCT/UNESP (S{\~a}o Paulo State University). This 
                         software will be available on the internet to realize the 
                         network-based positioning to S{\~a}o Paulo State users and/or 
                         researchers. The user must just choose the position, date, hour, 
                         and interval and the VRS data will be generated and sent by e-mail 
                         to the user. Data from SP/Network (GPS Active Network of Western 
                         S{\~a}o Paulo State) will be used as input for the software, 
                         where the reference stations are about 200 km apart. Concerning 
                         the network-based positioning implemented in the software, the VRS 
                         (Virtual Reference Station) concept is applied. But an alternative 
                         approach to VRS concept was developed. In the method, the integer 
                         ambiguities between reference stations are not resolved, and the 
                         network corrections are derived from external atmospheric 
                         (tropospheric and ionospheric) models. Related to the troposphere, 
                         the ZTD (Zenithal Tropospheric Delay) is computed using a NWP 
                         (Numerical Weather Prediction) model. In relation to the 
                         ionosphere, delays are computed from a Brazilian regional model. 
                         The method was tested and accuracy on the level of centimeter to 
                         decimeter was achieved (depending on the observable applied), 
                         which is suitable for several applications in Brazil. The internet 
                         page details, method description, results and analyses will be 
                         presented in this paper.",
  conference-location = "Foz do Igua{\c{c}}u",
      conference-year = "8-12 Aug. 2010",
             language = "en",
           targetfile = "alves_Development.pdf",
        urlaccessdate = "02 maio 2024"
}