基于磁悬浮控制力矩陀螺的航天器姿态高精度高带宽测量方法

针对航天器姿态测量精度和带宽之间相互制约问题，提出一种基于磁悬浮陀螺的航天器姿态高精度、高带宽测量方法。根据刚体动力学和坐标变换原理建立磁悬浮转子径向转动合外力矩模型。在框架静止条件下，通过实时检测磁悬浮控制力矩陀螺（MSCMG）中的磁轴承电流、磁悬浮转子位移，计算出磁悬浮转子径向转动所受合外力矩以及磁悬浮转子径向偏转信息，间接得到航天器运动对磁悬浮转子径向转动作用力矩，进而求出航天器单轴姿态角速度和姿态角加速度。不同带宽下的仿真结果表明，本测量方法能同时检测出航天器单方向的姿态角速度和角加速度，并且满足高精度高带宽要求。

High Accuracy and High Bandwidth Measurement Method of Spacecraft Attitude Based on MSCMG

Aimed at the interaction problems between accuracy and bandwidth of spacecraft attitude measurement, this paper presents a spacecraft attitude measurement method with high precision and high bandwidth based on magnetically suspended control moment gyroscope (MSCMG). According to the rigid body dynamics and the principle of coordinate transformation, a magnetically suspended rotor radial torque model is established. When the frame is motionless, through real-time detecting magnetic bearing current and rotor displacement, get magnetically suspended rotor radial total torque and radial deflection information, then the magnetically suspended rotor radial torque caused by spacecraft motion is obtained. According to the magnetically suspended rotor radial torque expressions caused by the spacecraft motion, analytical expressions are presented for spacecraft attitude angle velocity and attitude angle acceleration in single direction. Verified by simulation in different bandwidth, the current measurement method can detect spacecraft attitude angle velocity and angle acceleration in single direction, and meet high-precision and high-bandwidth requirements.