Patent ID: 7859678
Filing Date: 2010-12-28
Classification: G01C

Abstract:
1. An automatic gain control for a fiber optic gyroscope system that includes a fiber optic gyroscope control loop arranged to process signals output from the fiber optic gyroscope, comprising: an adjustable gain applied to the signal output from the fiber optic gyroscope; a pilot signal generator arranged to inject a pilot signal into the fiber optic gyroscope control loop which results in an output signal from the fiber optic gyroscope; a compensation loop arranged to receive signals output from the fiber optic gyroscope control loop and to receive pilot signals from the pilot signal generator, the compensation loop being arranged to process the pilot signal to produce a compensation signal that is combined with signals output from the fiber optic gyroscope control loop to provide a compensated fiber optic gyroscope output signal; and an automatic gain control loop connected between the compensation loop and the adjustable gain applied to the fiber optic gyroscope output signal, the automatic gain control loop including a gain error demodulator arranged to multiply the compensated fiber optic gyroscope output signal and the compensation signal together to produce a gain error signal used to control the adjustable gain in order to stabilize the gain of the fiber optic gyroscope control loop.