| ZHA Guozhen,HE Qingyou,GUAN Changlong,CHEN Jitao. 2018. A curvelet-based method to determine wave directions from nautical X-band radar images. Acta Oceanologica Sinica, 37(1):11－19 |
| A curvelet-based method to determine wave directions from nautical X-band radar images |
| 一种新的从船用X波段雷达图像中确定波向的方法 |
| Received:August 10, 2017 |
| DOI：10.1007/s13131-018-1154-z |
| Key words:X-band radar wave direction surface wave curvelet transform |
| 中文关键词: Curvelet变换 X波段雷达 海浪 波向 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | ZHA Guozhen | College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China | | | HE Qingyou | State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Science, Guangzhou 510301, China | | | GUAN Changlong | College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China
Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China | clguan@ouc.edu.cn | | CHEN Jitao | Hydrology Bureau of Yellow River Conservancy Commission, Zhengzhou 450004, China | |
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| Abstract: |
| A new method to determine wave directions from nautical X-band images is proposed. The signatures of ocean waves show obvious scale and directional characteristics in nautical X-band radar images. Curvelet transform (CT) possesses very high scale and directional sensitivities. Therefore, it has good capability to analyze ocean wave fields. The radar images are decomposed at different scales, in different directions, and at different positions by CT, and curvelet coefficients are obtained. Given to the scale and directional characteristics of surface waves, the information of ocean waves is centralized in the curvelet coefficients of certain directions and at certain scales. Therefore, the wave orientations can be determined. The 180 ambiguity is removed by calculating cross-correlation coefficients (CCCs) between continuous collected images. The proposed method is verified by the dataset collected on the Northwest coast of the Zhangzi Island in the Yellow Sea of China from March to April 2009. |
| 中文摘要: |
| 船用X波段雷达被广泛应用于海洋表面波观测和研究。本文给出了一种新的从船用X波段雷达图像中确定主波传播方向的方法。X波段雷达图像中的海浪信号具有明显的尺度性和方向性。同时，curvelet变换作为一种同时具备尺度分辨率和方向分辨率的数学变换，能够对一幅雷达图像在不同尺度、不同方向和不同位置上进行分析。对一幅雷达图像进行curvelet分解并获得curvelet系数后，波浪信号主要集中在某些特定尺度和方向的curvelet系数中，从而我们可以获得带有 方向模糊的波传播方向。进而，通过计算几幅连续采集图像的互相关系数可以消除 方向模糊。同步观测的雷达图像和浮标数据证明了该方法的有效性。 |
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