BIAS AND SCALE-FACTOR ERROR MITIGATION IN A CORIOLIS VIBRATORY GYROSCOPE SYSETM

摘要

One embodiment of the invention includes a CVG system. A plurality of electrodes electrostatically force a resonator into a periodic motion based on a drive axis forcer signal applied to a first set of the plurality of electrodes and a sense axis force-rebalance signal applied to a second set of the plurality of electrodes, and provides a sense axis pickoff signal and a drive axis pickoff signal. A gyroscope controller generates the drive axis forcer signal based on the drive axis pickoff signal and calculates an angular rate of rotation about an input axis based on the sense axis force-rebalance signal. The gyroscope controller modulates a predetermined disturbance signal component onto the sense axis force-rebalance signal and to control a modulation phase of the sense axis force-rebalance signal based on detection of the predetermined disturbance signal component in the sense axis force-rebalance signal to substantially mitigate bias and scale-factor error.

主权项

1. A Coriolis vibratory gyroscope (CVG) system comprising:
a sensor system comprising a plurality of electrodes configured to electrostatically force a resonator into a substantially periodic motion based on a drive axis forcer signal applied to a first set of the plurality of electrodes and a sense axis force-rebalance signal applied to a second set of the plurality of electrodes, and configured to provide a sense axis pickoff signal and a drive axis pickoff signal; and a gyroscope controller configured to generate the drive axis forcer signal based on the drive axis pickoff signal and to calculate an angular rate of rotation of the CVG system about an input axis based on the sense axis force-rebalance signal, the gyroscope controller being further configured to modulate a predetermined disturbance signal component onto the sense axis force-rebalance signal and to control a modulation phase of the sense axis force-rebalance signal based on detection of the predetermined disturbance signal component in the sense axis force-rebalance signal to substantially mitigate bias and scale-factor error.