Digital phase ramp type fiber optic gyro

Details Digital phase ramp type fiber optic gyro Digital phase ramp type fiber optic gyro

1990-11-28

1992-05-26

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1972

Patent

active

051161290

ABSTRACT:
In a digital phase ramp type fiber optic gyro, a first error signal is detected from the output of an opto-electric converter, and a step value is determined based on the first error signal. An accumulator accumulates the step values to produce an accumulated output as a digital ramp signal, and when the accumulated output exceeds a specified value, causes an overflow. The digital ramp signal is converted by a D/A converter to an analog signal, which is provided to an optical phase modulator. A second error signal detector detects the difference between the outputs of the opto-electric converter at an operating point when the overflow occurs and at the immediately preceding operating point. Based on the sign of the overflow and the sign of a biasing signal at the time of occurrence of the overflow, a negative feedback control circuit determines which of four values the operating point corresponds to, and creates a negative feedback error signal which controls the conversion gain of the D/A converter.

REFERENCES:
patent: 4705399 (1987-11-01), Graindorge et al.
patent: 5018859 (1991-05-01), Chang et al.
"Principle of the Digital Phase Ramp", Lefevre et al., 1986, pp. all.

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