The Research And Simulation On Satellite Attitude Control System Based On STK

The design and simulation of satellite attitude control system is an important part of satellite design.Also it plays very important role in the completion of the satellite task. When other sub-systems is under normal working conditions,resources satellite can take accurate pictures,relay satellites can communication between others, satellite constellation can maintain the relative position between the other. All of these are the tasks of satellite attitude control system.The real time display of the current satellite attitude is the important content of the satellite visual simulation system.In this paper, makes deep study of three-axis stabilized satellite attitude control and real-time display problems,The main work of this paper is as follows:First,established a satellite attitude and orbital mathematical model.Various description of the satellite attitude, The four elements of the kinematic equation has the ability of avoid the singularity problem and greatly reduce the computation of matrix operation, so we choice four elements of the kinematic equations, four elements in the actual project are also widely used.All this design and simulation are based on six degrees of freedom satellite attitude model.The thruster is the widely used actuator of three-axis stabilized satellite attitude control system.The chapterⅣdiscuess the installation location of the thrusters.Install the backup thruster and on this basis, the state flow diagram use to design the thruster failure strategy. And then design a PD controller and the attitude-to-ground directional navigation module. Large angle maneuver by ground orientation and spatial orientation of the inertia simulation experiments to verify the correctness and the whole control system robustness.Reaction Wheel for three-axis stabilized satellite attitude control system,first the satellite kinematics equation was changed to increase the momentum of the flywheel module. Then, the reaction of the mathematical model of the flywheel and the interference and noise, the establishment of a reaction wheel model, are designed PID controller and fuzzy controller for a small angle maneuver validation.Finally, based on the reaction flywheel control system and thruster control system,the STK-based research and design of real-time simulation.Establish a connection to STK and Matlab, simultaneous display of three-axis simulation of satellite position and attitude data. On this basis,there is a real-time display of the issues discussed, the use of RT_LAB compiled simulink model and make it run on the QNX real-time systems.