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A Depolarization Ratio Anomaly Detector to Identify Icebergs in Sea Ice Using Dual-Polarization SAR Images

机译：利用双极化saR图像识别海冰中冰山的去极化比率异常检测器

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Icebergs represent hazards to maritime traffic and\udoffshore operations. Satellite synthetic aperture radar (SAR) is\udvery valuable for the observation of polar regions, and extensive\udwork was already carried out on detection and tracking of\udlarge icebergs. However, the identification of small icebergs is still\udchallenging especially when these are embedded in sea ice. In\udthis paper, a new detector is proposed based on incoherent dualpolarization\udSAR images. The algorithm considers the limited\udextension of small icebergs, which are supposed to have a stronger\udcross-polarization and higher cross- over copolarization ratio compared\udto the surrounding sea or sea ice background. The new\uddetector is tested with two satellite systems. First, RADARSAT-2\udquad-polarimetric images are analyzed to evaluate the effects of\udhigh-resolution data. Subsequently, a more exhaustive analysis is\udcarried out using dual-polarization ground-detected Sentinel-1a\udextra wide swath images acquired over the time span of two\udmonths. The test areas are in the east coast of Greenland, where\udseveral icebergs have been observed. A quantitative analysis and\uda comparison with a detector using only the cross-polarization\udchannel are carried out, exploiting grounded icebergs as test\udtargets. The proposed methodology improves the contrast between\udicebergs and sea ice clutter by up to 75 times. This returns an\udimproved probability of detection.
机译：冰山对海上交通和近海作业构成危害。卫星合成孔径雷达（SAR）对于极地地区的观测非常有价值，并且已经在探测和跟踪超大冰山方面进行了广泛的研究。但是，小型冰山的识别仍然很困难，特别是当它们被嵌入海冰中时。本文提出了一种基于非相干双极化\ udSAR图像的新型探测器。该算法考虑了小冰山的局限性/延伸度，与周围的海或海冰背景相比，小冰山应该具有更强的\ ucrosscross-polarization和更高的cross-over copolarization ratio。新的\ uddetector已通过两个卫星系统进行了测试。首先，分析RADARSAT-2 \ udquad偏振图像，以评估\ ud高分辨率的数据的效果。随后，使用在两个月时间内获得的双极化地面检测到的Sentinel-1a \ udextra宽幅图像进行了更为详尽的分析。测试区域位于格陵兰岛的东海岸，那里曾观察到过几座冰山。利用地面冰山作为测试目标，对仅使用交叉极化\ udchannel的探测器进行了定量分析和比较。所提出的方法将\ udicebergs和海冰杂物之间的对比度提高了多达75倍。这会返回\\提高的检测概率。

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