Patent ID: 6028668
Filing Date: 2000-02-22
Classification: G01C

Abstract:
A fiber optic gyroscope system for producing a rate output signal comprising:a fiber optic gyroscope having a modulator and counter propagating waves for providing an output signal derived from a Sagnac phase shift between said counter propagating waves, said output being proportional to the rate of rotation of said fiber optic gyroscope;a demodulator for demodulating said output signal into a first harmonic signal, a second harmonic signal, and a fourth harmonic signal;a modulation controller for modulating the fiber optic gyroscope at a predetermined modulation phase shift established from the second harmonic signal and the fourth harmonic signal; anda phase tracker for tracking the first harmonic signal and the second harmonic signal to produce the rate output signal when the fiber optic gyroscope is modulated at the predetermined modulation phase shift.