Method for reducing bias error in a vibrating structure gyroscope
US7240533B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 1, 2005 |
| Grant date | Jul 10, 2007 |
| Priority date | — |
| Expiry date | Jun 21, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C19/5677
- WIPO fieldMeasurement
- WIPO sectorInstruments
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 SFQUAD over SFIN-PHASE is 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 SFQUAD is the quadrature scalefactor SFIN-PHASE is the in-phase scalefactor, φSD is the phase error in the secondary drive and φPPO is the phase error in the primary pick-off device. The total phase error φE is obtained directly from the measured Sin (φSD+φPPO) according to the relationship; φE=φ…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.