Research on wavelet denoising technology for laser/fiber hybrid inertial navigation system

For improving the device accuracy of the laser/fiber optic gyro hybrid inertial navigation system(INS), the static test of the system under different environments is carried out. It is revealed that the output of the fiber optic gyroscope(FOG) is seriously affected by the vibration signal and the error increases sharply when the two-frequency dithered laser gyroscope and FOG work together. Then the wavelet analysis method is used to filter and denoise for output of laser gyroscope and FOG. The data processing results show that this method is not only effective for the output of fiber optic gyroscope affected by jitter, but also suitable for the output of laser gyroscope. The mean output values of the two kinds of gyros are exactly the same before and after filtering. But the variance after filtering can be reduced by more than 96% compared with that before filtering and the noise reduction effect is significant. The feasibility of wavelet filtering is verified.