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基于机载合成孔径雷达（SAR）图像最优极化比的海尖峰抑制方法

Sea Spike Suppression Method Based on Optimum Polarization Ratio in Airborne SAR Images.

作者信息

Zhao Yawei, Chong Jinsong, Li Yan, Sun Kai, Yang Xue

机构信息

National Key Lab of Microwave Imaging Technology, Beijing 100190, China.

Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China.

出版信息

Sensors (Basel). 2021 May 9;21(9):3269. doi: 10.3390/s21093269.

DOI:10.3390/s21093269
PMID:34065130
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8126024/
Abstract

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.

摘要

在高分辨率机载合成孔径雷达（SAR）海洋观测条件下，海尖峰对SAR图像解译和海洋目标检测会造成严重干扰。为提高目标检测能力，有必要抑制SAR图像中的海尖峰。然而，目前尚无关于SAR图像中海尖峰抑制方法的报道。作为推进的一步，本文提出了一种基于机载SAR图像最佳极化比的海尖峰抑制方法。该方法仅适用于同时获取包含海尖峰的VV和HH双极化SAR数据的情况。通过计算最佳极化比，该方法进一步获得完成海尖峰抑制的全景区域差异图像。该方法应用于包含海浪、溢油和船舶的机载X波段SAR实测数据。结果表明，海尖峰得到了很好的抑制，海浪对比度和溢油对比度得到提高，船舶检测虚警率降低。对这些结果的讨论表明，所提方法能有效抑制海尖峰，提高SAR图像的可解译性。

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