Automatic gain control for fiber optic gyroscope deterministic control loops

摘要

An automatic gain control system for a fiber optic gyroscope control loop (13) includes an adjustable gain applied to the gyro output signal. A calibration signal is injected into the fiber optic gyroscope control loop (13). A compensation loop (42) receives signals output from the control loop (13) and also receives calibration signals. The compensation loop (42) processes the calibration signal to produce a compensation signal that is combined with signals output from the control loop (13) to provide a compensated fiber optic gyroscope output signal. An automatic gain control loop (51) is connected between the compensation loop (42) and the adjustable gain applied to the fiber optic gyroscope output signal. The automatic gain control loop includes a gain error demodulator (50) that multiplies the compensated fiber optic gyroscope output signal and the compensation signal together to produce a gain error signal used to control the adjustable gain to stabilize the gyro control loop gain.