Quadrature drift mechanism and control of bell-shaped vibratory angular rate gyro

Quadrature drift is the major error source of the bell-shaped vibratory angular rate gyro (abbreviated as BVG), and effective measures must been taken to eliminate it. The aim of this study wants to investigate the quadrature drift mechanism of BVG, in particular the closed-loop control method. The quadrature drift mechanism is deduced in detail on the basis of the equivalent dynamic model, drew a conclusion that the main factor caused quadrature error is frequency split. Quadrature control loop is designed by selecting appropriate electrodes to exert force, and suitable error signal to be error feedback signal. The simulation and experiment both verified the availability of the quadrature control method. The work in this paper will contribute to the system design of BVG.