A Study Of Anti-disturbance Of Large Radio Telescope Servo Control Algorithm

New Century at home and abroad are more and more attention in the field of deep space cosmos, with the growth in demand as well as research radio telescope technology exclusive new monthly day, countries are scrambling to build many different forms of radio telescopes to develop their own science and technology. A new generation of radio telescopes, high resolution, wide operating band is also growing, making the overall structure of large-scale design trends, the flexible nature of the structure is significantly enhanced, and the presence of external low frequency wind disturbances, these issues a higher antenna control system the pointing accuracy, tracking accuracy and robustness requirements for engineers to design and control aspects of the radio telescope to bring more technical difficulty.This paper focuses on the design problem of large radio telescope servo control system. First, have a study on the abroad existing antenna servo control algorithms Linear Quadratic Gaussian(LQG) algorithm and improved PI + LQG algorithm based on the LQG algorithm, and use the simulation and semi-physical simulation platform to control the object.Because the gust disturbance is the main disturbance source of the antenna system in practical work, this paper simulate antenna system based on the geographical environment with the wind, the wind torque and the wind speed in wind mathematical model of three different forms of antenna. In view of the object in this paper, we use the third gust wind speed model for research.Finally, in view of the antenna system has a high frequency unmodeled dynamics uncertainty and low frequency wind disturbance problems, mixed sensitivity controller is designed, and through the hardware-in-the-loop platform of the control accuracy of experiment analysis of wind resistance of each controller, the experimental results show that the mixed sensitivity controller not only can significantly improve the tracking precision of the wind disturbance situation, but also has strong anti-disturbance and robustness.