Research on the control method to improve the dynamic performance of high-precision fiber optic gyroscope

The high-precision fiber optic gyroscope (FOG) is a critical component of the airborne inertial navigation system, and researchers are beginning to focus more on its dynamic performance in addition to precision performance. With the precision performance improvement of FOG, the dynamic performances will decrease theoretically. In this paper, we established a dynamic control model of the FOG, and used it to analyse and simulate the startup angular velocity performance and the ability to resist angular acceleration impact performance. And, a control method based on MEMS gyroscope was designed which could assist the FOG in determining the number of interference fringes and correcting the number when abnormal output occurred. By comparing the dynamic performance test results of the high-precision FOG before and after the optimization, it was found that the optimized high-precision FOG could overcome the limitation of theoretical startup angular velocity and return to normal shortly after enduring an angular acceleration over 30×104°/s2. In addition to improving airborne inertial navigation system performance, the optimized FOG can be used in the aircraft health management system to improve the safety and reliability of the aircraft.