Closed-loop Control of Micro-hemisphere Resonant Gyroscope Based on Simulink
Due to its superior Q-value, the micro-hemisphere gyroscope shines in inertial precision guidance. How-ever, there is limited research on it, specifically regarding its ASIC circuit design. For the self-developed micro-hemisphere gyroscope, a Simulink simulation model for gyroscope and its driving and detection circuits is established. Firstly, the physical model and parameters of the gyroscope are obtained using a two-dimensional spring damping system. The actual measurement results show that the vibration rate disparity between the model and the actual object is merely 0. 5185 mm/s, which confirms the accuracy of the model. Then, a model based on force balance mode for phase-locked loop( PLL) and au-tomatic gain control( AGC) driving loop and detection loop is proposed, and amplitude demodulation is performed using du-al-phase locking method. Finally, the disparity between the obtained driving loop model frequency and actual vibration fre-quency is merely -0. 1924 Hz. The scale factor of the detection circuit model is 0. 0311 V/[(°)/s] , and the detection threshold is -0. 0013 ( °)/s～0. 0018 ( °)/s, which is a 22. 5％ improvement compared to other models. The proposed precise model building method and circuit structure of the micro-hemisphere gyroscope and its peripheral circuits lay the foundation for subsequent ASIC design.
micro-hemisphere resonant gyroscopeSimulinkstructure modelclosed-loop control
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