To get the wave parameters from an up-looking sonar on a subsurface moving platform

a method by applying motion compensation algorithm to extract wave spectrum is proposed.Based on the analysis of underwater platform movement and linear wave theory

a high-pass filter is used to reduce the low frequency components induced by vertical platform fluctuations.The trend of wave spectrum is obtained based on wavelet decomposition and reconstruction by means of Symlet wavelet.Furthermore

the wave spectrum is estimated by searching strategy to explore the minimum distance between the measured wave spectrum and the iterated spectrum with Doppler frequency shift due to sailing contrary to wave propagation at the platform velocity.Meanwhile

the significant wave height and other parameters can be calculated from the wave spectrum.The simulation results indicate that the method improves the measuring accuracy and the estimated spectrum is in good agreement with the original wave spectrum.It can be used for extending versatility of underwater moving platforms.