A Control Scheme for an Optical Gyroscope System Based on Hysteresis Compensation of Piezoelectric Materials

The hysteresis response of piezoelectric materials causes a gyro zero position error and drifts the gyro output signal, affecting modulation depth monitoring. Specifically, the nonlinear modulation response introduced by hysteresis deteriorates the controller phase and gain margins, forcing the amplitude of each harmonic to fluctuate and increasing the difficulty of modulator closed-loop feedback control. This article limits the inherent zero position error of the gyro to 0.3°/h by improving the closed-loop control scheme based on the hysteresis compensation model. The developed strategy overcomes the influence of the hysteresis characteristics of the piezoelectric phase modulator material on the gyro performance, affording zero bias stability of the full-temperature system of 1.25°/h, thereby stabilizing the system’s full-temperature performance.