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Laser space offers an attractive alternative in the military fields for its many advantages of wide bandwidth, high code rate, low power consumption and large capacity. Because the narrow laser beam will lead to many challenges in laser beam pointing, therefore, APT (acquisition, pointing and tracking) technology is one of key technology for the laser space communication. The ATP rough tracing servo turntable studied in this paper adopts two-axes-four-frame structure. In order to increase the tracking precision, the predictive control algorithm is adopted in the rough tracking position loop. The simulation result shows that, comparing with common PI controller, the predictive control algorithm could improve the dynamic response characteristics of the system and increase the tracking precision.

Most of modern industrial processes is continuous, large-scale and complex. Large time-delay system is increasingly common in the process of industrial production. It is difficult to make the system satisfy the performance specification requirements by traditional Proportional-Integral-Derivative (PID) control. Aiming at time-delay phenomenon, the paper discusses the Smith and Fuzzy control algorithm of time-delay system in order to improve dynamic performance of the system.