Design of Sliding Mode Variable Structure Control System for Resonant Fiber Optic Gyroscope

The paper designs a sliding mode variable structure control (VSC) system for resonant fiber optic gyroscope (RFOG). We have derived the state equation of the control system, given the design process of sliding mode variable structure control system, compared the step response of the control system under different control laws by simulation. The sliding mode variable structure control method is applied to the RFOG control system for the first time, the system static testing is performed using different control laws. The result shows that the VSC method can be well applied to the RFOG closed-loop frequency locking control system, compared with the traditional PID control method, the frequency locking accuracy of the RFOG control system is improved by about 18%. It shows that the VSC control method has better closed loop control performance.