Improved parametric method applied to wave estimation based on ship motion responses

Wave measurement technique based on ship motion response is a new technique used in moving vessels. Scholars mainly use parametric method to estimate wave, but the calculation of parametric method is complicated, the calculation time of parametric method is long, and the calculation values of parametric method is difficult to guarantee, The paper works on improving the existing parametric method. First, wave directional spectrum model is separated into wave distribution model and wave power spectrum model in the paper; Second, the parameters of the above two models are calculated separately. The improved parametric method reduces the number of parameters during nonlinear equation optimization process, which is more simple and accurate; finally the improved parametric method is validated by simulation.