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Alternative TitleAzimuth ambiguity removal method for ship detection based onspaceborne SAR images
邴磊; 邢前国; 邹娜娜; 李圳波; 吴樊
Source Publication中国图象图形学报
Contribution Rank中国科学院烟台海岸带研究所;中国科学院大学;烟台海事局;烟台五中;中国科学院遥感与数字地球研究所;
Other AbstractObjective The distribution of ships at sea is a key factor for maritime traffic analysis and ship safety management. With the rapid development of earth observation technology, remote sensing is now considered a useful tool to detect ships at sea on a large scale. Particularly owing to the unique technical properties, such as being less vulnerable to cloud and mist and being unaffected by day and night, synthetic aperture radar ( SAR) is widely used for ship detection in maritime security management. However, azimuth ambiguities caused by the mechanism of SAR imaging can be easily misclassified as ships on SAR images, leading to a high false alarm rate in ship detection, which has been a difficult problem in ship monitoring with SAR. Method Considering this issue, the mechanism of azimuth ambiguities on SAR images was initially analyzed in this study. Then, a new method for azimuth ambiguity removal was proposed based on this mechanism. The removal process of azimuth ambiguities includes three steps. First, the consistency of angles is estimated between the real target and its azimuth ambiguities. In this step, the determination method of azimuth angle between real target and its azimuth ambiguities was also discussed. Second, the uniformity of offset distance is determined, and determining the method of the azimuth distance between the real target and its azimuth ambiguities was also discussed. Third, energy decay is analyzed in the azimuth direction, considering that azimuth ambiguities of real ships on SAR images will follow the principles of energy decay. Using these three discriminant criteria, bright targets detected from SAR images can be classified as real ships and azimuth ambiguities. Result Radarsat-2 images covering the Bohai Sea or the North of the Yellow Sea were selected for a case study; the spatial resolution of these test images captured from March to June 2015 was 30 m. Using the method proposed in this research, azimuth ambiguities of ships were removed step by step and stored in a geodatabase. Real ship targets were further extracted and stored in a geodatabase. These results were compared with the Automatic Identification System data, which can be considered factual data for the case study. Experimental results indicate that all azimuth ambiguities in the study area were detected and removed from real ship targets. Conclusion After being tested with four Radarsat-2 images, the average accuracy of this azimuth ambiguity removal method based on spaceborne SAR images proposed in this research is more than 95. 8% . The results showed that this method can be effectively used to distinguish real ships from its azimuth ambiguities for 30 m spatial resolution SAR images and can improve the accuracy of ship detection on SAR images
Keyword船舶检测 方位向模糊 合成孔径雷达(Sar) 船舶自动识别系统(Ais) 遥感 Radarsat-2
Funding Organization中欧“龙计划”三期基金项目(10558)~~
Indexed ByCSCD
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Document Type期刊论文
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GB/T 7714
邴磊,邢前国,邹娜娜,等. 星载SAR影像上船舶方位向模糊去除算法[J]. 中国图象图形学报,2016,21(7):951-958.
APA 邴磊,邢前国,邹娜娜,李圳波,&吴樊.(2016).星载SAR影像上船舶方位向模糊去除算法.中国图象图形学报,21(7),951-958.
MLA 邴磊,et al."星载SAR影像上船舶方位向模糊去除算法".中国图象图形学报 21.7(2016):951-958.
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