Stabilizing Control For Airborne Opto-Electronic Platform With FOG

In stabilizing and tracking system of opto-electronic platform, a stabilizing control loop must be designed firstly because of various external disturbances. The stabilizing loop is the base of the high-precision tracking and the design of stabilizing loop affects the whole tracking system's performance directly. The control problems about the stabilizing loop of the airborne opto-electronic platform are discussed in this dissertation.Firstly the development of the opto-electronic platform in home and abroad was summarized. The facts that affect the stabilizing of the line-of-sight(LOS) and the stabilizing methods in common use at the present time were analyzed. And then the performance of the stabilization precision we want came out.In accordance with practical requirement, this system applys a platform with four frame but two stabilizing axes, adopts whole stabilizing method,and use direct current moment motor as a driver and fiber optic gyroscope(FOG) as the angle velocity sensor. The mathematics models of the motor and FOG were founded through experment measures and were predigested to analyze and design the controller expediently. The principal of how movement of airplane can be isolated by a two-axis platform is analyzed theoretically. Requirements of stabilization of LOS to servo system are put forward which provide the basis of theory for designing servo system.From the defination of the index of servo toughness, the approach of how to improve the stabilization precision is pointed out through some analysis. The controller in stabilizing loop was designed according to the requirement of the stabilizing accuracy with the frequence field responsing method. Also, there were the results of the simulation shown in figures.The effect of the noise of the FOG to the system ouput was analyzed from two sides of low and high frequence, and effective steps to suppress the noise of FOG were pointed out.The Popov's hyperstability theory was applied to design a model reference adaptive controller(MRAC) in allusion to the problem of model uncertainty which results from the variable load. And the robustness and the anti-jamming of the system were analyzed through the simulation.