According to the large random drift of fiber-optic gyro（FOG）

take application requirement of the shipborne strapdown inertial navigation system as researching target

the output signals character of shipborne FOG is analyzed thoroughly.Aiming at the demand of real-time

a wavelet filter algorithm which adopts the threshold de-noising method is designed.Combining the characteristic analysis result of the gyro signals design of wavelet basis

decomposition scale

the threshold and the thresholding function is realized.By checking the real-time capability and the result which is verified by practical test

the algorithm can achieve effective filtering of random drift noise of FOG

and satisfy the demand of real-time.