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@MastersThesis{Gomes:2004:DeÓrSa,
               author = "Gomes, Vivian Martins",
                title = "Determina{\c{c}}{\~a}o de {\'o}rbitas de sat{\'e}lites 
                         artificiais em tempo real atrav{\'e}s da solu{\c{c}}{\~a}o de 
                         navega{\c{c}}{\~a}o de GPS",
               school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
                 year = "2004",
              address = "S{\~a}o Jos{\'e} dos Campos",
                month = "2004-05-25",
             keywords = "engenharia e tecnologia espacial, {\'o}rbita, sat{\'e}lites 
                         artificiais, sistema de posicionamento global, filtro de Kalman, 
                         modelo din{\^a}mico, space technology and engineering, orbits, 
                         artificial satellites, global positioning system, kalman filters, 
                         dynamic model.",
             abstract = "O Sistema de Posicionamento Global (GPS) {\'e} um sistema de 
                         navega{\c{c}}{\~a}o por sat{\'e}lites que permite determinar o 
                         posicionamento tridimensional e tempo com alta precis{\~a}o. Seus 
                         principais objetivos s{\~a}o: aux{\'{\i}}lio a 
                         radionavega{\c{c}}{\~a}o, navega{\c{c}}{\~a}o em tempo real, 
                         cobertura global e r{\'a}pida aquisi{\c{c}}{\~a}o de dados 
                         enviados pelos sat{\'e}lites GPS. Prop{\~o}e-se neste trabalho 
                         estimar, em tempo real, o vetor de estado orbital composto de 
                         posi{\c{c}}{\~a}o e velocidade atrav{\'e}s do processamento da 
                         solu{\c{c}}{\~a}o de navega{\c{c}}{\~a}o obtida pelo receptor 
                         a bordo. Al{\'e}m destes fatores, se pretende determinar a 
                         tend{\^e}ncia e a deriva do rel{\'o}gio do receptor GPS a bordo 
                         de sat{\'e}lites. Neste trabalho {\'e} usado o filtro de Kalman 
                         para estimar o vetor de estado baseado nas observa{\c{c}}{\~o}es 
                         do receptor. O filtro de Kalman {\'e} usado devido a sua robustez 
                         em aplica{\c{c}}{\~o}es de tempo real, sem a necessidade de 
                         armazenar observa{\c{c}}{\~o}es, j{\'a} que elas podem ser 
                         processadas {\`a} medida que s{\~a}o coletadas. O modelo 
                         din{\^a}mico inclui perturba{\c{c}}{\~o}es devido ao 
                         geopotencial e as observa{\c{c}}{\~o}es s{\~a}o as 
                         solu{\c{c}}{\~o}es de navega{\c{c}}{\~a}o, obtidas de um 
                         receptor GPS a bordo do sat{\'e}lite, composta de 
                         posi{\c{c}}{\~a}o e tend{\^e}ncia do rel{\'o}gio de receptor. 
                         As componentes de velocidade da solu{\c{c}}{\~a}o de 
                         navega{\c{c}}{\~a}o n{\~a}o s{\~a}o utilizadas devido {\`a} 
                         sua baixa precis{\~a}o. Simula{\c{c}}{\~o}es e testes s{\~a}o 
                         feitos utilizando dados reais do sat{\'e}lite TOPEX/POSEIDON e 
                         observa{\c{c}}{\~o}es compreendendo tr{\^e}s dias. O vetor de 
                         estado estimado {\'e} comparado com as efem{\'e}rides precisas 
                         POE (Precise Orbit Ephemeris), produzidas pelo JPL/NASA. O 
                         desempenho e caracter{\'{\i}}sticas do procedimento proposto, 
                         tais como o efeito do modelo din{\^a}mico, tamanho do passo de 
                         integra{\c{c}}{\~a}o e efeito da disponibilidade seletiva (SA), 
                         s{\~a}o analisados para mostrar o impacto em termos da 
                         precis{\~a}o global alcan{\c{c}}ada. ABSTRACT: The Global 
                         Positioning System (GPS) is a satellite navigation system that 
                         allows the users to determine 3D positioning and the time with 
                         high precision. Its main purposes are: aid to radionavigation in 
                         three dimensions with high precision positioning, navigation in 
                         real time, global coverage and quick acquisition of data sent by 
                         the GPS satellites. It is proposed, in this work, to estimate, in 
                         real time, an orbital state vector composed by position, velocity, 
                         bias and drift of the GPS receiver clock on board satellites by 
                         processing the raw navigation solution obtained by the on-board 
                         receiver. In this work the Kalman filter is used to estimate the 
                         state vector based on the incoming observations from the receiver. 
                         The Kalman filter is used due to its robustness in real time 
                         applications, without unnecessary storage of observations, as they 
                         can be processed while being collected. The filter dynamic model 
                         includes perturbation due to geopotential and the observations are 
                         the raw navigation solution composed of position and receiver 
                         clock bias. The velocity components of the navigation solution are 
                         not used due to its low accuracy. Simulations and tests are done 
                         using real data from TOPEX/POSEIDON satellite and comprising three 
                         days of observations. A comparison is done between the estimated 
                         state vector and the precise orbit ephemeris (POE) produced by 
                         JPL/NASA. The proposed procedure performance and characteristics 
                         are analyzed, including effects of the dynamic model, step-size of 
                         integration and SA (Selective Availability) effect, to show the 
                         impact on the procedure in terms of global accuracy obtained.",
            committee = "Prado, Antonio Fernando Bertachini de Almeida (presidente) and 
                         Kuga, H{\'e}lio Koiti (orientador) and Chiaradia, Ana Paula 
                         Marins (orientadora) and Moraes, Rodolpho Vilhena de and Orlando, 
                         Valcir and M{\^o}nico, Jo{\~a}o Francisco Galera",
           copyholder = "SID/SCD",
         englishtitle = "Orbit determination of artificial satellites in real time using 
                         gps navigation solution",
             language = "pt",
                pages = "123",
                  ibi = "6qtX3pFwXQZ3P8SECKy/CMhKD",
                  url = "http://urlib.net/ibi/6qtX3pFwXQZ3P8SECKy/CMhKD",
           targetfile = "publicacao.pdf",
        urlaccessdate = "20 jun. 2024"
}


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