A force balance control circuit of hemispheric resonant gyroscope based on force balance mode

Abstract

The invention discloses a hemispherical resonant gyro force balance control circuit based on a force balance mode, and relates to the field of inertial sensors. The loop includes a hemispherical resonant gyro, an analog-to-digital converter, a signal demodulator, a low-pass filter, an average noise reducer, a loop controller, a signal modulator, and a dual digital-to-analog converter. Use the CORDIC algorithm to demodulate and modulate the signal, use the low-pass filter to extract the desired signal in the demodulation result, use the average noise reducer to reduce the signal noise, use the loop controller for correction control, and use the dual digital-to-analog converter The digital-to-analog conversion of the digital signal at the same frequency can conveniently greatly increase the number of digits of the digital-to-analog conversion, and improve the resolution of the feedback control signal while maintaining the dynamic range of the loop. The loop can greatly improve the control accuracy of the hemispherical gyroscope force balance loop, and is suitable for the high-precision hemispherical resonant gyroscope force balance mode.

Description

technical field The invention relates to a hemispherical resonant gyroscope digital control technology, in particular to a hemispherical resonant gyroscope force balance control circuit based on a force balance mode. Background technique The control system of the rate mode of the hemispherical resonator gyro includes an amplitude loop, a frequency-locked loop, a force balance loop, and a quadrature loop. The force balance loop is used to generate a corresponding signal according to the demodulation result of the input signal The electrostatic force is used to balance the Coriolis force caused by the angular velocity. The magnitude of the Coriolis force is proportional to the magnitude of the input angular velocity, so the magnitude of the balanced electrostatic force is also proportional to the magnitude of the input angular velocity. The magnitude of the electrostatic force is the output of the hemispherical resonant gyroscope. In the digital control system, it is necessar...

AI Technical Summary

Problems solved by technology

However, for digital-to-analog conversion chips, the number of bits and the conversion rate are often contradictory, and it is difficult to achieve a substantial increase in the number of bits at the same rate, which limits the resolution of the hemispherical resonator gyro force balance loop.

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