On The Robust Control Method Of Airborne Photoelectric Stabilized Platform

The airborne photoelectric stabilized platform can effectively isolate the motion interference of the carrier.Ensure that the line-of-sight of electro-optical equipment is always stable in order to accomplish combat missions such as enemy reconnaissance,target tracking,and precision strike.Greatly improve the operational performance of the aircraft.With the wide application of airborne photoelectric stabilized platform in the field of national defense and military,the requirement of the modern weapon system for the control technology of the airborne photoelectric stabilized platform is getting higher and higher.This paper takes the two-axis two-framework airborne photoelectric stabilized platform as the research object.In order to improve the performance of the control system,the research on robust control method of airborne photoelectric stabilized platform is carried out.The main work and innovative contributions are as follows:(1)The system composition of the airborne photoelectric stabilized platform is analyzed and the mechanism analysis of key components of the velocity-stabilized loop is conducted.The mathematical model of the selected airborne photoelectric stabilized platform is established by the method of system identification,and the disturbance factors affecting the system stability are studied.(2)The fractional-order PI~λD~μcontrol strategy for airborne photoelectric stabilized platform is studied.Aiming at the problems that the analytical method of fractional-order controller parameter solving is complex and the solving process can’t be programmed,a vector-based parameter design method is adopted.The fractional-order controller for velocity-stabilized loop of the airborne photoelectric stabilized platform is designed and simulation researches are carried out.The simulation results show that the use of fractional-order PI~λD~μcontroller not only improves the dynamic response characteristics of the control system,but also makes the system obtain stronger robustness.(3)The disturbance suppression principle of the disturbance observer is analyzed.Aiming at the noise amplification problem of the classical disturbance observer applied to the airborne photoelectric stabilized platform,an improved disturbance observer structure is studied to improve the disturbance suppression ability of the airborne photoelectric stabilized platform.Combined the fractional-order control and the improved disturbance observer,a fractional-order control strategy based on disturbance observation is proposed.Design and experiments of the fractional-order controller based on disturbance observation are carried out on the velocity-stabilized loop.The experimental results show that the proposed controller not only inherits the characteristics of fast response and strong robustness of fractional-order control,but also absorbs the advantage of the disturbance observer’s small dependence on the system model and strong anti-interference ability.The purpose of improving the performance of the airborne photoelectric stabilized platform control system can be achieved.