A High Precision Attitude Measurement Method for Spacecraft Based on Magnetically Suspended Rotor Tilt Modulation

Magnetically Suspended Control and Sensitive Gyro (MSCSG) is an attitude measurement and attitude control instrument. In order to realize high precision measurement of attitude angle velocity of spacecraft under the condition of output torque, a method of magnetically suspended rotor tilt modulation is proposed based on MSCSG. In the paper, the attitude angular velocity measurement principle of MSCSG is analyzed, and a conclusion is drawn that there is a contradiction between the output torque and the measurement accuracy. According to the working characteristics of MSCSG, the tilt modulation method of magnetically suspended rotor is proposed. By actively controlling the angular momentum tilt of the rotor, the method can measure the attitude angular velocity under the condition of output torque. By analyzing the measurement error, the method can effectively compensate the constant error and improve the measurement accuracy of attitude angular velocity. The experimental results show that tilt modulation can improve the measurement accuracy of attitude angle rate by 10 times compared with no tilt modulation. Simulation and experiment verify the correctness and superiority of the proposed method. The proposed method provides theoretical support for the integration of MSCSG attitude measurement and control.