Research On High Performance Robust Control For Airborne Optoelectronic Platform

In civilian monitoring,field rescue,precision agriculture and other fields,airborne optoelectronic platforms have been extensively used in target acquisition,tracking,targeting and positioning.However,the influence of internal disturbances such as friction,wirewound disturbance and external disturbances such as carrier shaking,wind winding is increasingly prominent.The key to realizing the high-performance robust control is to overcome the influence on these composite multi-source disturbances on airborne optoelectronic platforms.In order to improve the performance of airborne optoelectronic platform control,this paper investigates advanced robust control methods to compensate and suppress composite multi-source disturbances,and conducts a more in-depth study on high-precision piezoelectric actuator control for secondary stabilization.The main contents and achievements of this paper are as follows:(1)Discuss the motion model and the multi-source disturbances of airborne optoelectronic platform,discusses the characteristics and coupling relationship of its complex disturbances.For understanding airborne optoelectronic platform model and designing control method,this analysis owns the theory guiding significance.Depending to the structural design characteristics of compact airborne optoelectronic platform,this paper establishes its disturbance model including wirewound friction,adopts adaptive mutation differential evolution algorithm to identify and optimize disturbance model parameters.The motion model and disturbance model provide the theory basis for further advanced robust control.(2)Discuss the design principle of disturbance observer-based control and active disturbance rejection control.Analyze the describing function based on similarity and characteristics of these two methods in the frequency domain.According to the characteristics of nonlinear factor in active disturbance rejection control,the finite-time disturbance observer is proposed and its Lyapunov stability is proved.(3)The impact of sensor noise on the control system is analyzed.Non-phase-lag multi-snesor fusion is applied to improve the signal-to-noise ratio.Composite hierarchical anti-disturbance control with multisensor fusion for compact optoelectronic platforms is proposed,inverse model-based disturbance compensation and finite-time disturbance observer are applied to compensate multi-source disturbances in the inner loop,non-singular sliding mode control is adopted to suppress disturbances in the outer loop.The composite hierarchical structure realizes high-performance robust control.(4)Piezoelectric actuator control for secondary stabilization is dealt with.The nonlinear characteristics of piezoelectric actuator are analyzed and verified by experiments.A simplified second-order polynomial model-based piezoelectric actuator control method and double loop-based piezoelectric actuator control method are proposed to compensate for piezoelectric nonlinearity.The two methods have certain practical application value to airborne optoelectronic platform secondary stabilization.The research work in this paper provides theoretical support and technical reference for the application of high-performance robust control for airborne optoelectronic platforms,and it has certain reference significance for the researches and applications in related fields.