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In the visual axis stabilization system under the background of the shipboard, it is necessary to use the high-frequency and low-frequency of the FOG output signal, respectively. For the practical application, this paper proposes a method which contains de-noising and signal separation. This paper analysis the characteristics of the FOG output signal under shipboard conditions, and then based on lifting wavelet transform, select the appropriate wavelet basis, appropriate sliding window size and decomposition scale. Use MATLAB software simulation, the results show that the algorithm can meet realization of real-time premise de-noising and signal separation.