Research on dynamic compensation method for nonlinear characteristics of large aperture antenna

Abstract

The nonlinear characteristics are widely existed in all aspects of the Servo Drive System. The influence on pointing and tracking accuracy of high precision of large aperture radio telescope cannot be neglected. In this paper, the common non-linear characteristics are discussed, and the negative effects of these characteristics on the system are analyzed as well as the advantages and disadvantages of common non-linear compensation methods. Xinjiang 110-meter Radio Telescope (QTT) requires high pointing accuracy, which has high requirements for stability and reliability of equipment. Here, a non-linear dynamic compensation method is proposed to prevent the non-linear characteristics of antenna Servo Drive System, so as to reduce or eliminate the lag and error of tracking and pointing, improve the stability of the system and optimize the motion performance of large aperture antenna. Nonlinear dynamic compensation method has simple structure, strong robustness and high applicability. In this paper, the saturated non-linearity of large aperture antenna is simulated by combining computer simulation with semi-physical platform experiment. The actual compensation effect of the method is verified by taking the QTT antenna to be the controlled object. Finally, the further improvement direction of the non-linear dynamic compensation method is also discussed.