Integrated vibration suppression-based attitude tracking control of a flexible satellite in rapid imaging maneuver
摘要
A deployable solar array provides electrical power to many remote sensing satellites. The deployable solar arrays are long, wide, and thin, resulting in high flexibility. This flexibility poses some challenges to satellite attitude control. Nevertheless, remote sensing satellites require rapid maneuvers to take images from targets with imaging time constraints. To meet these challenges, satellites must perform rapid maneuvers. This rapid maneuver causes oscillation of the deployable solar array, which decreases the image quality. This study proposes an attitude control to eliminate the uncertainties caused by deploying solar array vibrations. Based on the uncertainties of the satellite model and environmental disturbances, an adaptive robust attitude controller is employed. The adaptive robust attitude control performs well in low maneuver rates. However, in rapid attitude maneuvers, the high-frequency vibration amplitude of the angular velocities increases. Therefore, an integrated control approach is used to suppress the vibrations. The input shaping technique is based on employing a command signal that eliminates vibrations generated in the satellite’s flexible components. The proposed control method is an adaptive robust attitude controller based on the input shaping technique. As a result, our work improves the jitter in imaging missions and reduces the remaining vibrations of the flexible components by utilizing the zero vibration input shaping technique. Finally, numerical simulations demonstrate that the proposed control method can improve pointing accuracy and stability and is robust to uncertainty.