Design and Application of a New Nonlinear Controller for Servo System of Antenna

This paper proposes the design and application of a new nonlinear sliding mode controller for servo system of antenna with a brushless driving motor. First, the dynamic properties of the servo system are analyzed, and the system model is simplified and established. After that, a chattering free sliding mode control strategy is designed to deal with the nonlinearity caused by the permanent magnet brushless driving motor. Finally, the results and analysis of the controlled experiment show that the proposed nonlinear sliding mode control strategy can be applied in the actual antenna system and significantly improve the tracking accuracy and speed of the servo system.