A Signal Extraction Method for Vibratory Gyro with the Conical Shell Resonator

In this paper, a signal extraction method of solid vibratory gyro with conical shell resonator was presented. This kind of conical shell resonator removed the isolation holes between piezoelectric electrodes. Firstly, the principle of the gyro was analyzed. Then the gyro's circuit system and algorithm was designed. The vibration excitation part took an independent DDS module as an accurate excitation signal source. The vibration signal was sampled after treating with analog filter. The vibration controlling and angular calculating were finished in DSP. The orthorhombic interference signal, which caused by the electrodes on sensing axis of the resonator without the isolation holes, was analyzed. According to the result of experimentation, a way can be presented to calculate the input angular speed by using the phase angle of vibration signal. The research achievement can provide a reference for a new vibratory gyro.