Wave Parameters Inversion from X-Band Marine Radar Image Sequence Based on the Novel Dispersion Relation Band-Pass Filter on the Moving Platform

It is well known that the dispersion relation plays an important role in extracting wave component. Although, the broad band dispersion relation band-pass filter (DRBPF) avoids the problem of inaccurate estimated current with maximum current velocity U _max. It only reserves the signal of sea clutter image power spectrum whose frequency is the same as intrinsic frequency of the sea wave. Also, the bandwidth will be enlarged with the increase of velocity of motion which results in the filter containing various noise on the moving platform. A novel board band DRBPF which can be used to retrieve wave parameters from X-band marine radar images on moving vessel was proposed. The novel DRBPF makes up the shortcoming that the traditional DRBPF can not be applied directly to inverse wave parameters on the moving platform. Moreover, the platform motion offset is added to the novel DRBPF which has the character that the bandwidth varies according to wave energy distribution. Based on the X-band radar image sequences collected on a moving vessel from Bohai Sea in China, the retrieved wave parameters are validated by comparison with the output parameters of WAMOS and WAVEX. The experiment result shows that the novel DRBPF is suitable for extracting wave component.