@Article{LopesOrlKugGueKon:1994:AtDeBr,
               author = "Lopes, Roberto Vieira da Fonseca and Orlando, Valcir and Kuga, 
                         H{\'e}lio Koiti and Guedes, Ulisses Thadeu and Kondapalli, Rama 
                         Rao",
                title = "Attitude determination of the brazilian satellite SCD1",
              journal = "Revista Brasileira de Ci{\^e}ncias Mec{\^a}nicas",
                 year = "1994",
               volume = "16",
               number = "Special Issue",
                pages = "11--18",
                 note = "International Symposium on Spacecraft Ground Control and Flight 
                         Dynamics, 7-11 Feb., 1994, S{\~a}o Jos{\'e} dos Campos.",
             keywords = "ENGENHARIA E TECNOLOGIA ESPACIAL, SPACECRAFT DESIGN, TESTING AND 
                         PERFORMANCE, EVIRONMENTAL RESEARCH SATELLITES, SATELLITE ATTITUDE 
                         CONTROL, SPACECRAFT PERFORMANCE, SPIN STABILIZATION, APPLICATIONS 
                         PROGRAMS (COMPUTERS), BRAZILIAN SPACE PROGRAM, GROUND SUPPORT 
                         SYSTEMS, OPERATIONAL PROBLEMS, PROBLEM SOLVING, SCD 1, Data 
                         Collection Satellite.",
             abstract = "This paper describes the main aspects of the attitude 
                         determination related to the first Brazilian satellite: the Data 
                         Collection Satellite (SCD1). The satellite was developed by the 
                         National Institute for Space Research (INPE) as the first of the 
                         four scheduled by the program called Complete Brazilian Space 
                         Mission (MECB). It is spin-stabilized and was injected in a 
                         near-circular orbit, at an altitude of approximately 760 km. The 
                         attitude determination is achieved in two phases. In the first 
                         one, preliminary attitude is computed from sensors' telemetry data 
                         corresponding to passes over the tracking station. In the second 
                         one, data encompassing all the preliminary attitudes are processed 
                         to fit a dynamic model whose parameters are estimated. This paper 
                         aims at describing these procedures, their mathematical 
                         development and their evolution along time since the conception of 
                         the project. We also describe our first experience of a real 
                         satellite attitude determination, main difficulties, problems 
                         faced, as well as the solutions sketched at the very last minute. 
                         The results obtained are presented and discussed based on the 
                         expected performance of the software developed by the INPE's 
                         flight dynamics team.",
                 issn = "0100-7386",
                label = "10092",
           targetfile = "1994_lopes.pdf",
        urlaccessdate = "04 maio 2024"
}