METHOD AND SYSTEM OF DUAL-MODE ACTUATION AND SENSING FOR REAL-TIME CALIBRATION OF AXISYMMETRIC RESONANT GYROSCOPES

摘要

A dual-mode actuation and sensing circuit actuates both modes of an axisymmetric gyroscope and senses both outputs thereof. The sum of the two outputs provides a self-sustaining closed-loop oscillation signal, while the difference of the two mode outputs is used for extracting differential rate information while rejecting the common-mode bias terms of the gyroscope to provide online bias calibration. The proposed system and method facilitates scale factor calibration of an axisymmetric gyroscope. Furthermore, the difference output of the dual-mode gyroscope can provide a mode-split indicator signal which can be used to automatically match the gyroscope modes.

主权项

1. A gyroscope apparatus comprising:
a resonator body; first and second drive electrodes coupled to the resonator body; first and second output electrodes coupled to the resonator body; interface circuitry for driving the first drive electrode and second drive electrode simultaneously with a calibration signal derived at least in part from output signals from the first and second output electrodes.