Composite disturbance attenuation based saturated control for maintenance of low Earth orbit (LEO) formations  

作　　者：Jian-cheng FAN Ke SUN 

机构地区：[1]National Key Laboratory of Inertial Technology, Beihang University, Beijing 100191, China [2]Novel Inertial Instrument & Navigation System Technology Key Laboratory of Fundamental Science for National Defense, Beihang University, Beijing 100191, China

出　　处：《Journal of Zhejiang University-Science C(Computers and Electronics)》2012年第5期328-338,共11页浙江大学学报C辑（计算机与电子（英文版）

基　　金：supported by the National High-Tech R & D Program (863) of China (No.2008AA12A216);the National Basic Research Program (973) of China (No.2009CB72400101C)

摘　　要：Maintenance of high performance formation control is important for low Earth orbit (LEO) formation missions of small spacecraft.In this paper,a model of nonlinear relative motion dynamics is built,and then nonlinear and important perturbations affecting the formation configuration,such as J 2 and atmospheric drag,are analyzed as disturbances.Global navigation satellite system based relative positioning with nonlinear filtering is adopted to provide state information associated with the perturbations.By combining disturbance observer based control with H ∞ state feedback,a composite disturbance attenuation controller is proposed for maintenance of continuous and accurate formation.With consideration of precise control relying on micro thrusters,a composite disturbance attenuation based saturated controller is designed and its stability is proved.Finally,through numerical simulations,we demonstrate that control accuracy is improved after effectively avoiding perturbations and that stabilization can be satisfied using this method.Maintenance of high performance formation control is important for low Earth orbit （LEO） formation missions of small spacecraft. In this paper, a model of nonlinear relative motion dynamics is built, and then nonlinear and important perturbations affecting the formation configuration, such as J2 and atmospheric drag, are analyzed as disturbances. Global navigation satellite system based relative positioning with nonlinear filtering is adopted to provide state information associated with the perturbations. By combining disturbance observer based control with H state feedback, a composite disturbance attenuation controller is proposed for maintenance of continuous and accurate formation. With consideration of precise control relying on micro thrusters, a composite disturbance attenuation based saturated controller is designed and its stability is proved. Finally, through numerical simulations, we demonstrate that control accuracy is improved after effectively avoiding perturbations and that stabilization can be satisfied using this method.

关 键 词：Formation maintenance PERTURBATION Disturbance attenuation H ∞ state feedback Saturated control 

分 类 号：V529.1[航空宇航科学与技术—人机与环境工程] TP13[自动化与计算机技术—控制理论与控制工程]