极化SAR图像海面船只监测方法研究

IOCAS-IR > 海洋环流与波动重点实验室

	极化SAR图像海面船只监测方法研究
其他题名	Ship detection with polarimetric SAR data
	李海艳
学位类型	博士
	2007-06-09
学位授予单位	中国科学院海洋研究所
学位授予地点	海洋研究所
关键词	极化合成孔径雷达二维卷积广义最优化模糊聚类船只监测
摘要	船只监测不论是在民用还是军用方面都有广阔的应用前景。极化合成孔径雷达（PolSAR）可以测量目标的极化散射特性，能够提高舰船检测的准确度和分类精度。论文以工程应用为背景，以深刻理解PolSAR图像成像原理及理论为基础，重点围绕PolSAR图像船海对比度增强和海上目标识别等方面开展了研究。本文在文献综述的基础上，全面分析了单极化和PolSAR图像舰船目标检测的研究现状。在现有的PolSAR图像目标检测方法基础上，针对双极化数据首次提出二维卷积方法提高船海对比度；针对全极化数据改进广义最优化方法，构造极化特征向量，将回波强度和极化散射特征有机结合，提高船海对比度。上述两种方法能解决船只回波强度和海面回波强度相近或高海况下船目标检测问题。将聚类方法应用到海上目标识别中，采用非监督分类-模糊聚类可以将船只、海上人造目标、船尾迹等识别开来，在海上目标识别方面将有广阔的应用前景。应用极化电磁波基本理论，将极化熵概念应用到船只监测。首次采用Bragg模式和双尺度模式分析两种不同极化熵随着入射角、波数和风场的变化情况，从而确定在低风速下Cloude熵相对Touzi熵更适合船只监测。
其他摘要	Ship detection has been widely used in the civil and the military. Polarimetric Synthetic Aperture Radar (PolSAR) can measure the polarimetric characters of objects and improve the accurate of ship detection and classification. The dissertation focuses on enhancing the contrast of ships to ocean and identifying the objects on the ocean surface based on the theory of PolSAR image and its engineering application background. The state-of-the-art of the study of ship detection with single and fully polarimetric SAR data is summarized. For dual-polarimetric SAR data, the two dimensional convolution is firstly proposed to detect ships. The algorithm improves the contrast of ships to ocean. For fully polarimetric SAR data, the improved generalized optimization of polarimetric contrast enhancement is presented to detect ships. The intensity of return wave is incorporated with the scattering mechanisms using the polarimetric feature vector. The above algorithms can detect ships when the intensity of ships approximates that of ocean. The fuzzy clustering is introduced in target identification on ocean surface. The man made targets, ships and ship wakes are identified with the unsupervised classification algorithm, which has great potential in targets identification on the ocean surface. The concept of polarimetric entropy is used in ship detection. Based on electromagnetic wave theory, the two kinds of entropy varying with incident angle, incident wave number and wind field are studied with Bragg and two-scale scattering model. It is shown that Cloude entropy is more adapt to ship detection than Touzi entropy with low wind.
页数	131
语种	中文
文献类型	学位论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/1271
专题	海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	李海艳. 极化SAR图像海面船只监测方法研究[D]. 海洋研究所. 中国科学院海洋研究所,2007.

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