Modernizing the Brazilian Active Control Network L.P.S. Fortes 1 , S.M.A. Costa 1 , M.A.A. Lima 1 , J.A. Fazan 1 , J.F.G. Monico 2 , M. C. Santos 3 and P. Tétreault 4 1 Directorate of Geosciences, Brazilian Institute of Geography and Statistics, Brazil 2 Department of Cartography, São Paulo State University, Brazil 3 Department of Geodesy and Geomatics Engineering, University of New Brunswick, Canada 4 Geodetic Survey Division, Natural Resources Canada, Ottawa, Canada BIOGRAPHY Luiz Paulo Souto Fortes holds a BSc in Cartographic Engineering from the Engineering Military Institute - IME, an MSc in Computer Science applied to Cartography also from IME and a Ph.D. in Geomatics Engineering from the University of Calgary. He has been working during the past 24 years for the Brazilian Institute of Geography and Statistics - IBGE, where he currently holds the position of Associate Director of Geosciences. Sonia Maria Alves Costa holds a BSc in Cartographic Engineering from the University of the State of Rio de Janeiro - UERJ, an MSc in Geodesy from the Paraná Federal University - UFPR, and a Ph.D. in Geodesy also from UFPR. She has been working during the past 19 years for the Brazilian Institute of Geography and Statistics - IBGE, where she currently holds the position of Coordinator of Geodesy. Marco Aurélio de Almeida Lima holds a BSc in Cartographic Engineering from the University of the State of Rio de Janeiro. He has been working during the past four years for the Brazilian Institute of Geography and Statistics - IBGE, where he currently holds the position of GPS Manager. Jardel Aparecido Fazan holds a BSc in Cartographic Engineering from the São Paulo State University, Presidente Prudente. He has been working during the past four years for the Brazilian Institute of Geography and Statistics - IBGE, where he currently holds the position of Manager of the Brazilian Network for Continuous Monitoring of GPS (RBMC). João Francico Galera Monico is an associate professor in the Departament of Cartography at FCT/UNESP. He holds a M.Sc. in geodesy from the Paraná Federal University, and a Ph.D in Space Geodesy from the University of Nottingham. He has been involved in research in the fields of space geodesy and adjustment. Marcelo C. Santos is an associate professor in the Department of Geodesy and Geomatics Engineering at UNB. He holds a M. Sc. in geophysics from the National Observatory in Rio de Janeiro, and a Ph.D. in geodesy from UNB. He is currently the president of the Geodesy Section of the Canadian Geophysical Union. He has been involved in research in the fields of space and physical geodesy and navigation. Pierre Tétreault holds a Master Degree in Applied Science from the University of Toronto. He is a member of the Active Control System Technology group of the Geodetic Survey Division of Natural Resources Canada where he contributes to the development of GNSS based applications for the maintenance and user access of the Canadian Spatial Reference System (CSRS). ABSTRACT The Brazilian Network for Continuous Monitoring of GPS – RBMC, since its foundation in December of 1996, has been playing an essential role for the maintenance and user access of the fundamental geodetic frame in the country,. It provides users with a direct link to the Brazilian Geodetic System - SGB. Its role has become more relevant with the increasing use of space navigation technology in the country. Recently, Brazil adopted a new geodetic system, SIRGAS2000, in February 2005, fully compatible with GNSS technology. The paper provides an overview of the recent modernization phases the RBMC network has undergone highlighting its future steps. From its current post-mission mode, the RBMC will evolve into a real-time network, providing real-time data and real- time correction to users. The network enhanced with modern GPS receivers and the addition of atomic clocks will be used to compute WADGPS-type corrections to be transmitted, in real time, to users in Brazil and surrounding areas. It is estimated that users will be able to 2759 ION GNSS 19th International Technical Meeting of the Satellite Division, 26-29 September 2006, Fort Worth, TX