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针对存在外界干扰的情况下使用单框架控制力矩陀螺(SGCMG)作为执行机构的卫星姿态大角度快速机动控制问题,设计了以Legendre伪光谱算法和滑模控制方法相结合的控制策略。采用能量与时间相结合的最优性能指标,应用Legendre伪光谱算法将最优控制问题转化成非线性规划问题,求解出能量和时间综合最优姿态机动轨迹。以该规划轨迹中的卫星姿态四元数和角速度信息为跟踪期望值,采用滑模变结构控制方法对其进行精确跟踪。该控制方法不仅实现了卫星姿态的快速控制,而且可以有效避免SGCMG陷入奇异状态。
Aiming at the large-angle and fast maneuvering attitude control using satellite single-frame control moment gyroscope (SGCMG) as actuator, a control strategy combining Legendre pseudo-spectral algorithm and sliding mode control is designed. Using the optimal performance index combining energy and time, Legendre’s Pseudo-spectral algorithm is applied to convert the optimal control problem to nonlinear programming problem, and the optimal trajectory of energy and time is obtained. Using the quaternion of satellite attitude and angular velocity information in the planned trajectory as the tracking expectation value, the sliding mode variable structure control method is used to accurately track it. The control method not only realized the quick control of the satellite attitude, but also effectively prevented the SGCMG from falling into a strange state.