@InCollection{RomeroSouz:2019:SaCoSy,
               author = "Romero, Alessandro Gerlinger and Souza, Luiz Carlos Gadelha de",
                title = "Satellite controller system based on reaction wheels using the 
                         State-Dependent Riccati Equation (SDRE) on Java",
            booktitle = "Proceedings of the 10th International Conference on Rotor Dynamics 
                         - IFToMM",
            publisher = "Springer",
                 year = "2019",
               editor = "Cavalca, Katia Lucchesi and Weber, Hans Ingo",
                pages = "547--561",
             keywords = "Nonlinear control · SDRE · Satellite · Attitude Reaction wheels.",
             abstract = "Complex space missions involving large angle maneuvers and fast 
                         attitude control require nonlinear control methods to design the 
                         Satellite Controller System (SCS) in order to satisfy robustness 
                         and performance requirements. One candidate method for a nonlinear 
                         SCS control law is the State-Dependent Riccati Equation (SDRE). 
                         SDRE provides an effective algorithm for synthesizing nonlinear 
                         feedback control by allowing nonlinearities in the system states 
                         while offering great design flexibility through state-dependent 
                         weighting matrices. In that context, analysis by simulation of 
                         nonlinear control methods can save money and time. Although, 
                         commercial 3D simulators exist that can accommodate various 
                         satellites components including the controllers, in this paper, we 
                         present a 3D simulator and the investigation of a SDRE control law 
                         performance by simulations. The simulator is implemented based on 
                         Java and related open-source software libraries (Hipparchus - 
                         linear algebra library, and Orekit - flight dynamics library), 
                         therefore, it can run in a variety of platforms and it has low 
                         cost. These open-source libraries were extended in order to solve 
                         the optimization problem that is the cornerstone of the SDRE 
                         method, a major contribution of the simulator. The simulator is 
                         evaluated taking into account a typical mission of the Brazilian 
                         National Institute for Space Research (INPE), in which the SCS 
                         must stabilize a satellite in three-axis using reaction wheels so 
                         that the optical payload can point to the desired target. Two SCS 
                         control laws (a linear and a SDRE based) were simulated for an 
                         attitude maneuver in the launch and early orbit phase (LEOP), the 
                         upside-down maneuver. The results of simulations shown that 
                         SDRE-based controller provides better performance.",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         {Universidade Federal do ABC (UFABC)}",
                  doi = "10.1007/978-3-319-99268-6_38",
                  url = "http://dx.doi.org/10.1007/978-3-319-99268-6_38",
             language = "en",
           targetfile = "romero_satelllite.pdf",
        urlaccessdate = "27 abr. 2024"
}