,Nonlinear suboptimal tracking control of spacecraft approaching a tumbling target

• 作 者: Zhan-Peng Xu Xiao-Qian Chen Yi-Yong Huang Yu-Zhu Bai Wen Yao
• 机 构: College of Aerospace Science and Engineering,National University of Defense Technology,Changsha 4100
• 出 处: 中国物理B（英文版）
• 发表日期: 2018年9期
• 关键词: tumbling target 6 degrees-of-freedom (DOF) relative motion suboptimal tracking c

We investigate the close-range relative motion and control of a spacecraft approaching a tumbling target.Unlike the traditional rigid-body dynamics with translation and rotation about the center of mass(CM),the kinematic coupling between translation and rotation is taken into consideration to directly describe the motion of the spacecrafts sensors or devices which are not coincident with the CM.Thus,a kinematically coupled 6 degrees-of-freedom(DOF)relative motion model for the instrument(feature point)is set up.To make the chaser spacecrafts feature point track the targets,an optimal tracking problem is defined and a control law with a feedback-feedforward structure is designed.With quasi-linearization of the nonlinear dynamical system,the feedforward term is computed from a specified constraint about the dynamical system and the reference model,and the feedback action is derived starting from the state-dependent Ricca equation(SDRE).The proposed controller is compared with an existing suboptimal tracking controller,and numerical simulations are presented to illustrate the effectiveness and superiority of the proposed method.