Gyro quadrature stabalization with demodulation phase error nulling
First Claim
1. A gyroscope system, comprising:
- a disc resonator gyroscope comprising a plurality of electrodes embedded in the disc resonator gyroscope, wherein the electrodes are configured for at least applying a drive voltage and a tuning voltage to the disc resonator gyroscope and for sensing operating parameters of the disc resonator gyroscope;
a force-to-rebalance (FTR) loop associated with the disc resonator gyroscope that senses an FTR signal from the disc resonator gyroscope;
an automatic gain control (AGC) loop associated with the disc resonator gyroscope that senses an AGC signal from the disc resonator gyroscope; and
a quadrature stabilization circuit configured to measure a quadrature error signal and generate a quadrature regulating voltage based on the quadrature error signal, wherein the quadrature error signal is measured using the FTR signal and the AGC signal and wherein the tuning voltage is adjusted by the quadrature regulating voltage to cancel an effect of voltage flicker on the tuning voltage before the tuning voltage is applied to a tuning electrode of the disc resonator gyroscope.
1 Assignment
0 Petitions
Accused Products
Abstract
A gyroscope system may include a disc resonator gyroscope including a plurality of electrodes embedded in the disc resonator gyroscope. The electrodes may be configured for at least applying a drive voltage and a tuning voltage to the disc resonator gyroscope and for sensing operating parameters of the disc resonator gyroscope. The gyroscope system may also include a quadrature stabilization circuit configured to measure a quadrature error and generate a quadrature regulating voltage based on the quadrature error. The tuning voltage may be adjusted by the quadrature regulating voltage to cancel an effect of voltage flicker before being applied to a tuning electrode of the disc resonator gyroscope.
19 Citations
24 Claims
-
1. A gyroscope system, comprising:
-
a disc resonator gyroscope comprising a plurality of electrodes embedded in the disc resonator gyroscope, wherein the electrodes are configured for at least applying a drive voltage and a tuning voltage to the disc resonator gyroscope and for sensing operating parameters of the disc resonator gyroscope; a force-to-rebalance (FTR) loop associated with the disc resonator gyroscope that senses an FTR signal from the disc resonator gyroscope; an automatic gain control (AGC) loop associated with the disc resonator gyroscope that senses an AGC signal from the disc resonator gyroscope; and a quadrature stabilization circuit configured to measure a quadrature error signal and generate a quadrature regulating voltage based on the quadrature error signal, wherein the quadrature error signal is measured using the FTR signal and the AGC signal and wherein the tuning voltage is adjusted by the quadrature regulating voltage to cancel an effect of voltage flicker on the tuning voltage before the tuning voltage is applied to a tuning electrode of the disc resonator gyroscope. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A gyroscope system, comprising:
-
a disc resonator gyroscope comprising a plurality of electrodes embedded in the disc resonator gyroscope, wherein the electrodes are configured for at least applying a drive voltage and a tuning voltage to the disc resonator gyroscope and for sensing operating parameters of the disc resonator gyroscope, wherein the plurality of electrodes comprise; a force-to-rebalance (FTR) electrode that senses an FTR signal; and an automatic gain control (AGC) electrode that senses an AGC signal; a demodulation phase tuning circuit configured to measure a demodulation phase angle error of the disc resonator gyroscope using the FTR signal and the AGC signal and to adjust a demodulation phase angle to about 90 degrees; and a quadrature stabilization circuit configured to measure a quadrature error and generate a quadrature regulating voltage based on the quadrature error, wherein the quadrature error is measured using the FTR signal and the AGC signal and wherein the tuning voltage is adjusted by the quadrature regulating voltage to cancel an effect of voltage flicker on the tuning voltage before the tuning voltage is applied to a tuning electrode of the disc resonator gyroscope. - View Dependent Claims (8, 9, 10, 11, 12, 14, 15, 16, 17)
-
-
13. The gyroscope system of 12, wherein the demodulation compensator is configured to use a magnitude and polarity of the bias error signal to generate the demodulation phase angle adjustment signal that drives the bias error signal to about zero.
-
18. A method, comprising:
-
applying a drive voltage to a drive electrode of a disc resonator gyroscope; applying a tuning voltage to a tuning electrode of the disc resonator gyroscope; measuring a demodulation phase angle error of the disc resonator gyroscope; adjusting a demodulation phase angle to about 90 degrees in response to the demodulation phase angle error measurement; measuring a demodulation quadrature error, wherein measuring the demodulation quadrature error comprises; sensing a force-to-rebalance (FTR) signal by an FTR electrode of the disc resonator gyroscope; and sensing an automatic gain control (AGC) signal by an AGC electrode of the disc resonator gyroscope; generating a quadrature regulating voltage based on the demodulation quadrature error; and adjusting the tuning voltage using the quadrature regulating voltage to cancel an effect of voltage flicker of the tuning voltage being applied to the tuning electrode. - View Dependent Claims (19, 20, 21, 22, 23, 24)
-
Specification