Abstract:

In order to overcome the traditional current retrieval algorithm’s shortcomings based on X-band radar, such as a large error existing at the low current rate and the unsteady result, an improved algorithm is proposed. Firstly, the noise is removed by using a dispersion relationship band filter. Secondly, the remaining non-linear wave image spectra are corrected by means of applying a modern transfer function, and a pure wave spectrum is obtained. The membership of every wave spectral component for support vector machines is determined according to the principle of structural risk minimization in the next step. Finally the product of wave energy and membership function is used as the weight to estimate an initial ocean surface current and carry on estimation iteratively. Using real shore-based X-band radar data for experiments, the results indicate that the improved algorithm has high accuracy and stable results, and it solves the problems in traditional methods. The study provides references for engineering applications.