中文摘要：

轨道机动时,测量与传输延迟,以及偏心推力对卫星姿态的持续扰动,造成传统的姿态稳定控制方法控制性能下降。为了克服这些问题,设计了对外扰与状态同时估计的闭环-开环预测器。在外扰力矩定常的假设下,给出了此种估计器对状态与外扰的预测都收敛的判定准则。利用估计出的外部扰动前馈补偿推力偏心干扰力矩,同时利用预测出的系统状态设计状态反馈控制器。通过求解两个代数Riccati方程,设计最优状态反馈增益和预测器增益。这种简单的前馈反馈结构具有良好的工程可实现性,同时仿真结果显示,该方法可以有效克服延迟和干扰的影响,提高卫星轨道机动时本体姿态稳定精度。

英文摘要：

For a satellite attitude control system,time delays are often caused by information processing in measurement devices,computation of the control input and information transmission among sensors controllers and actuators,which degrade the system dynamic performance and become a source of potential instability.During the orbital maneuver,the presence of large disturbance torques caused by the thruster misalignment makes the problem even severer.In this paper,a closed-loop and open-loop state and disturbance predictor is presented.Assuming that the disturbance is constant,a criterion for the convergence of the predicted states and disturbance to their real values is given.The predicted disturbance is used for feed forward compensation and the predicted states as state feedback.By solving two algebraic Riccati equations,the optimal steady state feedback gain and predictor gain are formulated.This simple predictor-controller structure proposed here can be easily implemented by a digital microprocessor.The simulation results demonstrate the effectiveness of this approach.