Research of the discrete sliding mode variable structure algorithm based on the exponential trending rule

Instability characteristics of a shipborne satellite communication station tend to reduce the tracking accuracy and communication quality. To improve the system performance, an antenna servo controller based on DSP is developed in this paper. For the servo system, a new algorithm based on the exponential trending rule discrete sliding mode variable structure algorithm is proposed. The theoretical analysis is derived and experimental simulating are developed. Experiment results show that a discrete controller and its control algorithm satisfies the stability. Compared with the traditional PID law, the novel algorithm has much better performance on real-time adjustment. The sensitivity of the servo system to the continuous or unexpected interferences are greatly reduced and robustness are obviously strengthened.