As the X-band marine radar often suffers from interference of electromagnetic waves of the same frequency transmitted
by radars in its vicinity, the acquired images frequently contain co-channel interference noise. The noise degrades the
quality of the marine radar images and is unfavorable to the processing and interpretation of the marine radar images.
To suppress the noise in marine radar images, a novel method based on pulse-pulse correlation is proposed. This method
includes three steps: threshold segmentation, noise extraction and noise fixing. In the threshold segmentation step, the
threshold T is calculated based on the K distribution sea clutter model. In the noise extraction step, a 3×3 window is
applied. By using the window, the pixels of noise can be extracted, and at the same time the pixels of non-noise can be
discarded. In the noise fixing step, the strategy of piecewise interpolation is applied. At the region near to the image
center, the triangulation with linear interpolation algorithm is applied; at the region far from the image center, the nearest
neighbor algorithm is applied.
The real X band marine radar image was used to test the performance of the proposed method. The obtained results show
that the proposed method is able to reduce the co-channel interference noise from the marine radar images significantly
and keep the information of objects in the images such as ships and islands. Besides, the proposed method can be fast in
speed of operation.