基于自适应的大气相干长度测量仪控制系统设计

Design of Differential Image Motion Monitor Control System Based on Adaptive PID Controller

通过跟踪移动信标来测量大气湍流参数时,高精度的伺服控制技术是影响其测量精度的主要因素之一;在常规PID控制的基础上,从自适应的角度出发,设计了一种适用于相干长度测量仪的且参数可自整定的控制器;当系统受扰动作用或系统运行状态变化时,在对系统不断辨识的基础上,依据性能指标,配置期望极点,实时调整控制器的参数值,实现系统的自适应,改善系统的鲁棒性;仿真及实验结果表明,采用自适应PID控制,在常值干扰下,系统的超调量减少26%,调节时间缩短1.28s;跟踪20mrad/s的目标时,系统的脱靶量峰峰值减小41.78%,稳态误差减小29.3%。相较于常规PID控制器,自适应PID控制器可减小超调量,缩短调节时间,优化跟踪性能,控制效果更好。

High accuracy servo control technique is one of the main factors affecting the measurement accuracy of atmospheric turbulence parameters.Considering the adaptive technology,the controller applicable to the differential image motion monitor was designed based on PID control strategy and could realize parameter self-tuning.When disturbance affects system or the system state changes,the self-adaptive controller is realized and the robustness is improved by changing controller parameters real-timely according to the expected pole assignment strategy and system identification.The results of simulation and experiment test show that with adaptive PID controller,the system＇s overshoot is reduced by 26 ％ and its regulation time is shortened by 1.28 s when facing the constant disturbance,also,its peak missdistance and steady-state error are reduced by 41.78％ and 29.3％ when tracking the target with the speed of 20 mrad/s.The control effect of the adaptive PID controller is better than that of the common PID controller for reducing the overshoot,shortening the regulating time and improving the tracking performance.