Synchronous Control of Drive Motor of Radio Telescope Servo System postprint

Abstract: The servo system of the radio telescope’s driving motor exhibits speed mismatch during operation, which restricts the high-precision pointing and tracking control of the tele#2;scope. With the aperture of the telescope increases and precision improves, this issue will significantly impact the high-precision control of pointing and tracking for large-aperture radio telescopes. To reduce speed deviations in the servo system and enhance the pointing accuracy of the radio telescope, a robust motor synchronization controller based on mod#2;el predictive control (MPC) is designed. To address external disturbances and unmodeled errors, disturbance observer (DOB) is designed based on the system’s state-space model to estimate total disturbances. Additionally, Luenberger observer (LOB) is designed to esti#2;mate the system’s states. Combining these observers with MPC, quadratic cost function is designed to regulate the load angle and motor speed. This ensures motor speed synchroniza#2;tion while maintaining tracking control effectiveness. Simulation and experimental results demonstrate that compared to conventional proportion-integration (PI) controllers combined with cross-coupled structures (CS), MPC+DOB+LOB enhances the servo system’s dynamic performance and synchronization capabilities.