Rotational inertia coupling selfcorrecting interference suppression control of airborne photoelectric platform
                                                     CONG Jingwen1,2, TIAN Dapeng1, SHEN Honghai1
(1.Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China; 2.Daheng Institute, University of Chinese Academy of Sciences, Beijing 100049, China)

Abstract: Aiming at the problem that the coupling effect between two axes and four frames of airborne photoelectric platform seriously affects the control accuracy, the coupling relationship of rotational inertia of each frame was studied, and the servo system controller was designed. Based on the coupling relationship between the direction transfer matrix and the frame, the mathematical models of the rotational inertia of each frame axis was established, and the angular variation data of the rotational inertia coupling between the frames of the airborne photoelectric platform was designed by UG software. At the same time, based on the established mathematical model of rotational inertia combined with the traditional disturbance observer to realize the realtime correction of the nominal inverse model under the control of the speed control loop PI, an improved disturbance observer was designed. The results show that the mathematical model of rotational of inertia is correct, and the improved disturbance observer can estimate the equivalent disturbance more accurately, so that the control loop can be controlled more effectively.

Key words: airborne optoelectronic platform; twoaxis fourframes; rotational inertia coupling; disturbance observer（DOB）