基于MSCMG大型遥感卫星高精度姿态控制方法

摘要

针对大力矩飞轮前馈和闭环反馈补偿复杂、对精度影响敏感性大的问题,提出了基于磁浮控制力矩陀螺闭环补偿的大型遥感卫星高精度姿态控制方法.该方法采用磁悬浮力矩陀螺为控制执行机构,通过变结构反馈补偿控制律设计,建立新的运动补偿控制系统,减小相机和卫星本体耦合效应.基于磁浮力矩陀螺力矩大、反向激励扰动小、精度高的特性,将其应用于对地遥感成像相机运动补偿控制系统中,仿真结果表明,与飞轮前馈补偿相比,姿态稳定度提高了一个数量级,有效提高空间大惯量卫星姿态控制的稳定度,提升相机对地成像质量;研究结果可为甚高精度卫星姿态控制与载荷运动补偿提供参考.%Focusing on the complexity and precision problem of the feed forward and closed-loop feed backward system of large-torque flywheels, a high-precision attitude control method based on magnetically suspended control moment gyros (MSCMG) is proposed for large-scale remote sensing satellite. The MSCMG is used as actuator mechanism of the control system and applied into the camera movement com- pensation system of remote sensing satellite. Based on the control law design of variable-structure feedback compensation, a novel motion compensation control system is established to reduce the coupling between the camera and the platform. The characteristics of the MSCMG, such as large torque, small inverse excitation and high precision, are analyzed and applied into the motion compensation control system of the ground remote sensing imaging camera. Simulation results show that, compared with the traditional flywheel feed forward compensation, the platform stability by the proposed MSCMG-based method is increased by an order of magnitude, and the attitude stability as well as the image quality is effectively improved. The research results can be used as references for the development of the very high precision satellite attitude control and the payload movement compensation.