In the condition of ocean observation for high-resolution airborne synthetic aperture radar (SAR), sea spikes will cause serious interference to SAR image interpretation and marine target detection. In order to improve the ability of target detection, it is necessary to suppress sea spikes in SAR images. However, there is no report on sea spike suppression methods in SAR images. As a step forward, a sea spike suppression method based on optimum polarization ratio in airborne SAR images is proposed in this paper. This method is only applicable to the situation where VV and HH dual-polarized SAR data containing sea spikes are acquired at the same time. By calculating the optimum polarization ratio, this method further obtains the difference image of the panoramic area accomplishing sea spike suppression. This method is applied to a field airborne X-band SAR data, including ocean waves, oil spills and ships. The results show that the sea spikes are well suppressed, the contrast of ocean waves and the contrast of oil spills are improved, and the false alarm rate of ship detection is reduced. The discussions on these results demonstrate that the proposed method can effectively suppress sea spikes and improve the interpretability of SAR images.

中文翻译：

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最优极化比的机载SAR图像峰值抑制方法

在高分辨率机载合成孔径雷达（SAR）的海洋观察条件下，海峰会严重干扰SAR图像解释和海洋目标检测。为了提高目标检测的能力，有必要抑制SAR图像中的海峰。但是，目前尚无关于SAR图像中海峰抑制方法的报道。为此，本文提出了一种基于最优极化比的机载SAR图像海浪抑制方法。此方法仅适用于同时获取包含海峰的VV和HH双极化SAR数据的情况。通过计算最佳偏振比，该方法还获得了实现海峰抑制的全景区域的差分图像。该方法适用于现场机载X波段SAR数据，包括海浪，溢油和船舶。结果表明，海峰得到了很好的抑制，海浪的对比度和漏油的对比度得到改善，降低了船舶探测的误报率。对这些结果的讨论表明，所提出的方法可以有效地抑制海峰并提高SAR图像的可解释性。