第23卷第5期 2015年5月
1004-924X(2015)05-1394-07
文章编号
光学精密工程
Optics and Precision Engineering
Vol. 23No.5
May.2015
空间光通信精跟踪系统的模糊自抗扰控制
崔宁1*，陈兴林1，曹开锐1,2，于志亮1，徐川川1（1.哈尔滨工业大学航天学院，黑龙江哈尔滨，150001；
2.哈尔滨工业大学可调谐激光技术国家级重点实验室，黑龙江哈尔滨150001）
摘要：针对输入光束抖动及卫星本体微报动对空间光通信系统跟踪精度的影响，设计了模棚自抗扰控制器，提出了对精跟踪系统进行控制的方法。首先，建立了精跟踪系统模型，对系统内外扰动进行分析，并模拟了卫星振动信号。针对系统自身所受的扰动及输人光信号的不确定性，设计了模糊自抗扰控制器。提出的控制方法通过扩张状态观测器观测卫星本体振动及系统未建模动态，应用微分跟踪器提高系统动态响应性能，并用模糊控制原理改进了非线性状态误差反馈
方法在不同频率及幅值的输人信号下均能提高系统跟踪精度，跟踪精度可以达到士8urad，跟踪误差减小了50%左右。
该方法基本满足空间光通信精跟踪系统对跟踪速度、跟踪精度及抗干扰能力的要求。关键词：空阔光通信；精跟踪；模糊自抗扰；卫星振动
中图分类号：TN929.1
文献标识码：A
doi;10.3788/OPE.20152305.1394
Fuzzy active disturbance rejection control of fine tracking system
forfreespaceopticalcommunication
CUINing'',CHENXing-lin',CAOKai-rui-2,YU Zhi-liang',XUChuan-chuan(1.SchoolofAerospace，HarbinInstituteofTechnology，Harbin150ool,China;
2.National Key Laboratory of Tunable Laser Technology, HarbinInstituteof Technology,Harbin150001,China) Correspondingauthor，E-mail:cuining_720@126.com
Abstract: In consideration of the effects of input beam jitter and satellite micro vibration on the tracking precision of a space optical communication system, a fuzzy active disturbance rejection controller is designed and a control method for the fine tracking system in optical communication is proposed. Firstly, a fine tracking system model is established, the internal and external disturbances of the system are analyzed and the satellite vibration signals are simulated. Then, focused on the uncertainties of system disturbance and input optical signals, the fuzzy active disturbance rejection controller is designed. The proposed method observes satellite vibration and unmodelled dynamics of the system by an extended state observer and uses a differential tracker to improve the dynamic response performance of the system. Then it utilizes fuzzy control theory to improve the nonlinear state error control law, by which the system can adjust adaptively proportion and differential gains.
收稿日期；2014-08-20；修订日期：2014-10-12
基金项目：国家自然科学基金资助项目（No.10904026）