Closed loop fiber optic gyroscope with signal processing arrange

Details Closed loop fiber optic gyroscope with signal processing arrange Closed loop fiber optic gyroscope with signal processing arrange

1992-04-24

1994-01-11

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1964

Patent

active

052786315

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. The square wave amplitude from a cycle immediately after a retrace is considered as errant data that should be excluded from a phase nulling loop. Thus, the phase nulling loop has more accurate input data so that feedback will be accomplished more effectively for improved gyro performance.

REFERENCES:
Lefevre et al. "Integrated Optics: a practical Solution for the Fiber-Optic Gyroscope", SPIE vol. 719 Fiber Optic Gyros: 10th Anniversary Conference (1986) pp. 101-119.

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