空间非合作航天器抓捕后姿态抗干扰控制

For the attitude stabilization control problem of post-capture non-cooperative spacecraft with unknown and uncertain inertial parameters, a novel anti-disturbance attitude control method is proposed based on an intermediate state observer, while considering multiple disturbances and control input magnitude and rate constraints. The traditional attitude stabilization control methods often need known information on the inertial parameter and state of the flexible spacecraft. If the above information is unknown, it will be difficult to achieve attitude stabilization with high precision, and it will be easy to cause the control input to be not able to meet the restricted requirements. To solve this problem, considering the control input magnitude and rate constraints, an anti-disturbance control method is proposed based on an intermediate state observer. The observer is constructed by introducing an auxiliary variable using the state information and lump disturbance, and a novel anti-disturbance controller is then designed. The Lyapunov stability analysis method is used to prove that the designed controller can ensure the global asymptotic stability of the closed-loop system. Compared with the existing mixed H₂/H_∞ controller, the developed controller does not require the attitude and modal information of the flexible body, and the identification process of inertial parameters either. Finally, simulation comparisons further verify the effectiveness and superiority of the designed controller.