Measuring and testing – Instrument proving or calibrating – Speed – velocity – or acceleration
Reexamination Certificate
2007-07-10
2007-07-10
Noland, Thomas P. (Department: 2856)
Measuring and testing
Instrument proving or calibrating
Speed, velocity, or acceleration
C073S001770, C073S504120, C073S514290
Reexamination Certificate
active
10527454
ABSTRACT:
A method for reducing bias error in a Vibrating Structure Gyroscope having a vibrating structure, a primary drive for putting the vibrating structure into carrier mode resonance, a primary pick-off device for sensing carrier mode motion, a secondary pick-off for sensing response mode vibration of the vibrating structure in response to applied rotation rate, a secondary drive for applying a force to control the response mode motion, closed loop primary control loops for maintaining a fixed amplitude of motion at the primary pick-off device, for maintaining the drive frequency at the resonance maximum, and secondary control loops for maintaining a null at the secondary pick-off device. In the method the ratio SFQUADover SFIN-PHASEis measured from the secondary control loop to provide a direct measurement of Sin (φSD+φPPO), according to the relationship SFQUAD=SFIN-PHASE×Sin (φSD+PPO) where SFQUADis the quadrature scalefactor SFIN-PHASEis the in-phase scalefactor, φSDis the phase error in the secondary drive and φPPOis the phase error in the primary pick-off device. The total phase error φEis obtained directly from the measured Sin (φSD+φPPO) according to the relationship; φE=φSD+φPPOand phase corrections applied to the secondary drive and/or primary pick-off device to reduce the phase error φE, and hence the quadrature bias error, to enhance the performance of the gyroscope.
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Fell Christopher Paul
Kazer Andrew
BAE Systems plc
Crowell & Moring LLP
Noland Thomas P.
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