Hemispherical resonator gyro

Details Hemispherical resonator gyro Hemispherical resonator gyro

G - Physics

01

C

79/9

G01C 19/56 (2006.01)

Patent

CA 1250458

ABSTRACT A vibratory rotation sensor having a resonator capable of sustaining a vibration pattern in a plane perpendicular to an input axis, a support disposing the resonator along the input axis, a forcer for initiating an elliptical vibration pattern in the resonator, including a circular forcer electrode and first, second, third and fourth sets of discrete orthogonal forcer electrodes, the first and second sets of discrete forcer electrodes displaced one from the other by 45 degrees and defining first and second axis sets, the third and fourth sets of discrete forcer electrodes displaced one from the other by 45 degrees and defining third and fourth axis sets interposed between the first and second axis sets, a pickoff responsive to resonator motion along the first and second axis sets and including first and second sets of discrete orthogonal pickoff electrodes, the pickoff producing first and second combined pickoff signals that represent the vibration pattern components along the first and second axis sets, a reference phase generator for generating timing signals, a demodulator including the reference phase generator for demodulating the first and second combined signals to derive first and second error signals, the first error signal representing the quadrature part of the first combined pickoff signal at the pattern node and the second error signal repre- senting the quadrature part of the second combined pickoff signal at the pattern antinode, a control interconnected with the pickoff and forcer and responsive to the nodal quadrature signal for maintaining components of vibration along the first and second axis sets in phase, the control also responsive to the antinodal quadrature signal for keeping the phase of the reference phase generator locked to the phase of vibration pattern.

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