Path Planning and Composite Attitude Control for a Satellite with 2-DOF Large-Inertia Turntable

Aiming at the great disturbance to the satellite attitude caused by the rotation of the two-degree-of-freedom (2-DOF) large-inertia turntable, based on the trajectory planning of the turntable scanning motion and the coupling dynamic modeling of the turntable and the satellite, a feedforward and feedback composite controller is designed. Using Archimedes spiral to plan the trajectory of the sub-satellite point that the turntable load points to can make the turntable’s rotation angle and speed change smoothly, so as to reduce the disturbance of the turntable motion to the satellite attitude, and improve the time uniformity of the load field of view to cover the ground target. According to the accurate dynamic model of the 2-DOF turntable, the disturbance torque caused by the turntable to the satellite is calculated as the feed-forward control torque in real time. The feedback control torque is calculated according to the satellite attitude deviation and angular velocity deviation. The simulation results verify the effectiveness of the composite controller, which effectively reduces the adverse impact of turntable motion, and the high-precision and high-stability attitude control is achieved.