@InProceedings{OrlandoKugaLope:1997:ReGeTe,
               author = "Orlando, Valcir and Kuga, Helio Kuga and Lopes, Roberto Vieira da 
                         Fonseca",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "Reducing the Geopotential Tesseral Harmonic Effects on Autonomous 
                         Longitude Drift Control of Sun-Synchronous Satellites",
                 year = "1997",
                pages = "361--374",
         organization = "Advances in the Astronautical Sciences.",
             keywords = "ENGENHARIA E TECNOLOGIA ESPACIAL.",
             abstract = "Within a cooperation framework between INPE (National 1nstitute 
                         for Space Research of Brazil) and CNES (Centre National d'Etudes 
                         Spatiales of France), a study of a method for autonomous longitude 
                         phase drift control was carried out and applied to phased orbits. 
                         Real and simulated outputs from the DIODE autonomous orbit 
                         determination system, developed by CNES, were preliminarly used to 
                         test the concept. A simplified parabolic model was considered for 
                         the longitude phase drift (L'>Lo ) time evolution. The 
                         coefficients of this model are estimated in real time, from 
                         observations of the first time derivative of L'>Lo (say{"}'Lu), 
                         which are computed from the navigator orbit estimates. By using 
                         the coefficients estimates, the model is used in the control 
                         procedure in order to evaluate the amplitude of orbit sem i-major 
                         axis corrections and the maneuver execution time. The obtained 
                         results were very promising showing the feasibility of the 
                         autonomous control impIementation. In particular, this paper deals 
                         with the reduction cf the oscil!ations caused by the Geopotential 
                         tesseral harmonic on the observations of {"}'Lu in order to 
                         improve the studied autonomous orbit control procedure. We started 
                         from a revised issue of the Ustinov's theory for near circular 
                         orbits. The fuI! equations for the tesseral harmonics 
                         perturbations on the orbit sem i-major axis and inclination have 
                         been simplified considering low altitude, near zero eccentricity 
                         and near polar phased orbits.",
           copyholder = "SID/SCD",
                label = "10926",
             language = "en",
               volume = "95",
        urlaccessdate = "20 maio 2024"
}