| X波段雷达近岸影像波谱分析 |
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| 引用本文： | 冯向波,严以新,高家俊,吴立中.X波段雷达近岸影像波谱分析[J].海洋工程,2010,28(1). |
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| 作者姓名： | 冯向波 严以新 高家俊 吴立中 |
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| 作者单位： | 1. 河海大学,水文水资源与水利工程科学国家重点实验室,江苏,南京,210098;河海大学,海岸灾害及防护教育部重点实验室,江苏,南京,210098
2. 台湾成功大学,水利及海洋工程学系,台湾,台南,701 |
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| 基金项目： | 水文水资源与水利工程科学国家重点实验室开放基金资助项目(2008491011);;江苏省普通高校研究生科研创新计划资助项目(CX09B165Z) |
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| 摘 要： | X波段岸基雷达作为一种新颖的海况遥感观测方式,可直接观测到实时的海况信息。通过对雷达影像的分析,能够获得海面上的波浪场。由于波浪在近岸的折射、浅化变形等原因,观测到的雷达影像场为近岸非均匀波浪场,在一定程度上限制了传统影像分析方法——傅里叶变换的应用。针对波浪的近岸非均匀性,将二维小波变换应用于雷达影像分析,子影像中6个空间点的波数谱显示:影像中的波浪非均匀性显著,主能量的波数呈现明显的增加趋势。二维小波变换应用到X波段雷达近岸影像处理中,可较好体现近岸波浪的非均匀性。
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| 关 键 词： | X波段雷达 近岸影像 波谱 二维小波变换 |
Wave spectrum analysis of nearshore X-band radar image |
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| FENG Xiang-bo,YAN Yi-xin,GAO Jia-jun,WU Li-zhong.Wave spectrum analysis of nearshore X-band radar image[J].Ocean Engineering,2010,28(1). |
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| Authors: | FENG Xiang-bo YAN Yi-xin GAO Jia-jun WU Li-zhong |
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| Institution: | 1.State Key Laboratory of Hydrology-Water Resource and Hydraulic Engineering;Hohai University;Nanjing 210098;China;2.Key Laboratory of Coastal Disaster and Defence;Ministry of Education;3.Department of Hydraulic and Ocean Engineering;National Cheng Kung University;Tainan 701;China |
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| Abstract: | In the application of remote sensing,X-band land-based radar is an appropriate technique in monitoring sea states,and wave field can be obtained from radar images.Fourier transform(FT) is the common algorithm in processing of investigating wave information from radar images,which makes one assumption that the wave field within radar images should be spatially homogeneous.However,nearshore wave field within radar images is non-homogeneous,resulting in ambiguity of wave characteristics by averaging the inform... |
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| Keywords: | X-band radar nearshore wave image wave spectrum two-dimensional wavelet transform |
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