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A novel method to suppress noise in marine radar images based on pulse-pulse correlation

机译：基于脉冲-脉冲相关性的海洋雷达图像噪声抑制新方法

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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.
机译：由于X波段船用雷达经常受到附近雷达发射的相同频率电磁波的干扰，因此获取的图像经常包含同频干扰噪声。噪声降低了船用雷达图像的质量，并且不利于船用雷达图像的处理和解释。为了抑制海洋雷达图像中的噪声，提出了一种基于脉冲-脉冲相关性的新方法。该方法包括三个步骤：阈值分割，噪声提取和噪声固定。在阈值分割步骤中，基于K分布海杂波模型来计算阈值T。在噪声提取步骤中，将应用3×3窗口。通过使用该窗口，可以提取噪声像素，同时可以丢弃非噪声像素。在噪声固定步骤中，应用了分段插值策略。在靠近图像中心的区域，应用带有线性插值算法的三角剖分;在远离图像中心的区域，应用最近的邻居算法。使用真实的X波段船用雷达图像测试了该方法的性能。所得结果表明，所提出的方法能够显着减少来自海洋雷达图像的同信道干扰噪声，并在图像中保留诸如船舶和岛屿之类的物体信息。此外，所提出的方法可以快速地操作。

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