Digital signal processing method and device for micro-mechanical gyroscope

Abstract

The invention relates to a digital signal processing method and a device for a micro-mechanical gyroscope. The device mainly comprises a digital signal processor, a direct digital frequency synthesizer, a digital phase-locked loop and an analog-to-digital converter. The frequency synthesizer is used for outputting a sine drive signal with controllable frequency and amplitude. A drive feedback signal and an angular velocity readout signal are synchronously converted by the analog-to-digital converter; the converted frequency is an integral multiple of the frequency of the drive signal, and thesampling time length is an integral multiple of the period of the drive signal. With the adoption of the digital signal processor, the sampling data is multiplied by the fixed sine and cosine coefficients, and the input angular velocity and the orthotropic error as well as the phase and the amplitude of the drive feedback signal are resolved in an accumulative manner, and the phase parameters areutilized for adjusting the frequency of the drive signal, so that the frequency of the drive signal follows up the resonance frequency of the gyroscope. The amplitude parameters are utilized for adjusting the amplitude of the drive signal, so that the vibration amplitude is constant. The device realizes the drive of the micro-mechanical gyroscope and the digitization of the angular velocity demodulation, has simple structure and high computation precision, and is easy to produce and transplant in batch.

Description

technical field [0001] The invention relates to the field of micro-electro-mechanical systems, in particular to a micro-mechanical gyroscope digital signal processing method and device, which are used for the control of a vibrating micro-mechanical gyroscope drive circuit and the demodulation output of input angular velocity. Background technique [0002] Micromechanical gyroscopes have the advantages of small size, light weight, and low price, and are widely used in the fields of automobiles, aircraft stability control, weapon system navigation guidance, and micro-satellite attitude control. The common feature of vibrating micromechanical gyroscopes based on the working principle of Coriolis force is that there are two vibration directions perpendicular to each other, namely, the driving vibration direction and the sensitive vibration direction under the Coriolis force. Its working principle is that the inertial mass driving the micro-gyroscope vibrates in the driving axis....

AI Technical Summary

Problems solved by technology

Most of the existing methods are implemented by analog circuits, including analog multipliers or switching multipliers and filters, phase shifters, etc. Such circuits have disadvantages such as poor linearity, small dynamic range, large temperature drift, and difficult debugging.

Existing digital detection methods are difficult to accurately measure angular velocity signals and quadrature error signals

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