The invention discloses an excitation circuit and
system of a hemispherical
resonator gyro, and relates to the technical field of hemispherical
resonator gyroscopes, the excitation circuit comprises a sampling circuit, a controller, a digital-to-analog conversion circuit and a
signal amplification circuit, the sampling circuit is connected with the controller and the hemispherical
resonator gyro, and the digital-to-analog conversion circuit is connected with the
signal amplification circuit. The
vibration sensor is used for collecting vibration signals of a hemispherical resonator of the
hemispherical resonator gyroscope and outputting the vibration signals to the controller, the controller is connected with the digital-to-analog conversion circuit and used for generating digital excitation signals according to the vibration signals and outputting the digital excitation signals to the digital-to-analog conversion circuit, and the digital-to-analog conversion circuit is connected with the
signal amplification circuit. The signal conversion circuit is connected with the
hemispherical resonator gyroscope and used for converting the digital
excitation signal into an analog
excitation signal and outputting the analog
excitation signal to the
signal amplification circuit, and the
signal amplification circuit is connected with the
hemispherical resonator gyroscope and used for amplifying the analog excitation signal and outputting the analog excitation signal to a
capacitor electrode of the hemispherical resonator
gyroscope, so that the accuracy of the excitation signal is improved, and the hemispherical resonator keeps stable vibration in a four-wave amplitude vibration mode.