Pointing and tracking control with linearization and state feedback for gimbal on floating platform
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摘要: 在空间漂浮平台上,两自由度转台在跟踪指向空间目标的过程中对平台会产生姿态扰动,使平台姿态发生变化,从而影响转台末端的空间指向,降低指向跟踪精度,因此转台与平台间存在耦合关系.当指向机构的转动惯量相对较大或快速精密指向时这种耦合关系变得不可忽视.为改善这一情况下的跟踪控制精度,提出了耦合补偿方法,加入平台实时姿态来修正转台跟踪的目标,并使用结合反馈线性化的状态反馈控制方法,最终通过仿真实验与传统PD控制方法进行对比,结果表明结合反馈线性化的状态反馈控制方法有效提高了跟踪精度.Abstract: 2-DOF (degree of freedom) gimbal mounted on floating space platform caused attitude disturbance to the platform while pointing and tracking a space object. Therefore the attitude of platform was affected then the pointing direction of the end of the gimbal changed and the pointing accuracy was reduced. So the gimbal and the platform were dynamically coupled. This problem could not be ignored especially when the inertia of the gimbal was not small enough compared to that of the platform or when the gimbal was rotating fast. In order to solve this problem, a coupling compensation method was put forward. In this method, attitude motion of platform caused by the rotation of gimbal was considered to revise the tracking target of the gimbal. Furthermore, feedback linearized state feedback was used as control method. At last a simulation was carried out to compare the pointing accuracy between traditional PD control method and the method put forward. It is verified that the pointing accuracy is efficiently improved by using linearization and state feedback as control method.
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Key words:
- floating platforms /
- tracking control /
- coupling /
- feedback linearization /
- state feedback
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[1] Sendi C,Ayoubi A M.Robust fuzzy logic-based tracking control of a flexible spacecraft with H∞ performance criteria[C]//AIAA SPACE 2014 Conference and Exposition.Reston:AIAA,2014:1-17. [2] 刘剑峰,韩琦琦,于思源,等.卫星光通信终端二维转台运动参量对天线指向影响研究[J].宇航学报,2007,28(4):926-931.Liu J F,Han Q Q,Yu S Y,et al.Research on the influence of the motion parameters of the satellite optical communication terminal's gimbals on antenna pointing error[J].Journal of Astronautics,2007,28(4):926-931(in Chinese). [3] 韩琦琦,于思源,马晶,等.耦合运动对星间激光链路瞄准过程影响及补偿方法研究[J].宇航学报,2006,27(4):582-587.Han Q Q,Yu S Y,Ma J,et al.Influence analysis of coupled motions on pointing progress of intersatellite optical communication[J].Journal of Astronautics,2006,27(4):582-587(in Chinese). [4] Sevaston E G,Schier J A,Theodore C I,et al.A precision pointing system for space telescope class optical trackers[C]//Guidance,Navigation and Control Conference.Reston:AIAA,1988:452-470. [5] 韩琦琦,马晶,于思源,等.卫星光通信中耦合运动对光信号跟踪影响分析[J].宇航学报,2005,26(4):405-409.Han Q Q,Ma J,Yu S Y,et al.Impact analysis of coupled motions of the optical communication terminal and the satellite platform on optical tracking progress[J].Journal of Astronautics,2005,26(4):405-409(in Chinese). [6] 谭立英,吴世臣,韩琦琦,等.潜望镜式卫星光通信终端的CCD粗跟踪[J].光学精密工程,2012,20(2):270-276.Tan L Y,Wu S C,Han Q Q,et al.Coarse tracking of periscope-type satellite optical communication terminals[J].Optics and Precision Engineering,2012,20(2):270-276(in Chinese). [7] 刘凌居.空间卫星光通信终端指向误差分析及粗瞄系统控制策略设计[D].哈尔滨:哈尔滨工业大学,2012.Liu L J.Analysis of satellite optical communication terminal's pointing error and control design in coarse pointing[D].Harbin:Harbin Institute of Technology,2012(in Chinese). [8] 崔凯.二维跟踪转台与卫星平台的动力学耦合技术研究[D].北京:中国科学院大学,2013.Cui K.Study of the dynamics coupling between the two-axis gimbal and the satellite bus[D].Beijing:University of Chinese Academy of Sciences,2013(in Chinese). [9] Smith A L,Kunz D L.Dynamic coupling of the KC-135 tanker and boom for modeling and simulation[J].Journal of Aircraft,2007,44(3):1034-1039. [10] 陈兴林,郑燕红,贾琪,等.星间光通信扫瞄捕获过程分析[J].哈尔滨工业大学学报,2009,41(11):34-38.Chen X L,Zheng Y H,Jia Q,et al.Scanning acquisition process of optical communications[J].Journal of Harbin Institute of Technology,2009,41(11):34-38(in Chinese). [11] 凌志华.卫星光通信中光束粗瞄控制算法设计与仿真[D].哈尔滨:哈尔滨工业大学,2007.Ling Z H.Design and simulation of control algorithm for laser beam pointing in intersatellite optical communication[D].Harbin:Harbin Institute of Technology,2007(in Chinese). [12] 李铭宽.星上运动部件指向的跟踪控制方法研究[D].哈尔滨:哈尔滨工业大学,2012.Li M K.Tracking control method for the moving parts on a satellite[D].Harbin:Harbin Institute of Technology,2012(in Chinese). [13] 葛升民,王磊,甘克力,等.星载大型空间天线的一种解耦控制方法[J].宇航学报,2013,34(1):46-53.Ge S M,Wang L,Gan K L,et al.A method for decoupling control of satellite-borne large space antenna[J].Journal of Astronautics,2013,34(1):46-53(in Chinese). [14] Khalil K H.非线性系统[M].北京:电子工业出版社,2005:373-375.Khalil K H.Nonlinear system[M].Beijing:Publishing House of Electronic Industry,2005:373-375(in Chinese). [15] 姚楠.空间激光通信系统中目标跟瞄算法研究[D].长春:长春理工大学,2007.Yao N.Research on targeting tacking algorithm in space laser communication system[D].Changchun:Changchun University of Science and Technology,2007(in Chinese).
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