Closed loop fiber optic gyroscope with fine angle resolution

Details Closed loop fiber optic gyroscope with fine angle resolution Closed loop fiber optic gyroscope with fine angle resolution

1992-04-24

1994-01-18

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1964

Patent

active

052803392

ABSTRACT:
A closed loop fiber optic gyro features signal processing wherein square wave phase modulation is added to a modulation drive signal after overflow logic so that the square wave modulation will not cause a phase modulation ramp to exceed overflow/underflow logic limits. The arrangement is such that the phase modulation causes a retrace with each modulation period when the amplitude of the ramp is within predetermined limits. Corrections to the retrace limit are implemented so as to scale a digital output, which enables the determination of accumulated gyro angle with a finer resolution than simple output pulse accumulation as has heretofore been the case.

REFERENCES:
patent: 5116129 (1992-05-01), Ishigami

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