空间光通信粗瞄系统的扰动估计与补偿  

Disturbance estimation and compensation of free space optical communication coarse tracking system

作　　者：王岩[1] 崔宁[1] 于志亮[1] WANG Yan;CUI Ning;YU Zhiliang(School of Aerospace, Harbin Institute of Technology, Harbin 150001, China)

机构地区：[1]哈尔滨工业大学航天学院,黑龙江哈尔滨150001

出　　处：《国防科技大学学报》2017年第5期178-184,共7页Journal of National University of Defense Technology

基　　金：国家自然科学基金资助项目(10904026)

摘　　要：粗瞄系统以直流力矩电机驱动二维转台为执行机构,通过粗瞄控制器对其进行控制。对系统受到的扰动进行分析,应用了最速跟踪微分器提取速度信号;以二维转台的方位轴为控制对象,在其位置环、速度环采用级联线性自抗扰控制器,通过线性扩张状态观测器主动补偿扰动,达到内外环双重隔离扰动的目的,提高跟踪精度;之后进行了实验分析。分析结果表明:在加入同样的模拟扰动信号,输入2 Hz,5 Hz和8 Hz的正弦信号时,与比例、微分、积分控制器相比,跟踪误差的标准差约降低50%;验证了线性扩张状态观测器具有扰动补偿效果;在输入不同频率正弦信号时,自抗扰控制器对输入信号频率的变化不敏感,仍能保证较高的跟踪精度。Affected by the influence of the attitude variation and vibration of the satellite platform in the process of tracking and pointing,free space optical communication terminal will therefore reduce the tracking precision of the system.In order to improve the system's ability for the purpose of resisting disturbance,on the basis of coarse tracking system,the cascade linear active disturbance rejection controller was put forward.The coarse tracking system used direct current brushless torque motor driving two-dimensional turntable as the actuator,and was controlled by the coarse tracking controller.Analysis of the system disturbance is required,for which the tracking differentiator is applied to extract.With azimuth axis of the two-dimensional turntable as the object,the cascade linear active disturbance rejection controller was applied to position loop and speed loop for the sack of active disturbance compensation through linear extended state observer.Therefore,double isolation of internal and external loop disturbance can be achieved,and the tracking precision shall be improved.The experimental analysis,and a comparison with the proportion integral derivation controller were also included.The research results show that there is a50%decrease of standard deviation referred to the tracking error,when inputting2Hz,5Hz and8Hz sinusoidal signals with the same disturbance signal simulation.At the same time,the observer's disturbance compensation effect in the circumstance of linear expansion was verified.A high tracking accuracy is still ensured when active disturbance rejection control is not sensitive to the frequency variation of inputted sinusoidal signal with changing frequency.

关 键 词：空间光通信 粗瞄系统 线性自抗扰 扰动补偿 

分 类 号：TN929.1[电子电信—通信与信息系统]