Anti-vibration design and real-time filter methods for FOG IMU used in helicopter

The bias error, nonlinear, non-gauss noise, and more arithmetic error of inertial navigation system was caused by vibration. It was a key technology to restrain the error caused by disturbance vibration. A novel method, which combining anti-vibrator and data filtering was proposed. A kinetics model of anti-vibration system for fiber optic gyroscope (FOG) inertial measurement unit (IMU) was established. The anti-vibration system can implement multi-dimension uncoupled, and eliminate vibration disturbance resource. A real-time filter method with little time delay was designed to restrain the resonance disturbance caused by anti-vibrator and random noise, and then reduce the arithmetic error. The experimental results show that the proposed method can effectively restrain disturbance vibration, reduce noise and navigation error, and help to develop a high-power head and orientation measurement system.