| 利用C波段RADARSAT-2单极化SAR图像的方位向截断波长估计有效波高 |
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| 引用本文： | 任林,杨劲松,郑罡,王隽.利用C波段RADARSAT-2单极化SAR图像的方位向截断波长估计有效波高[J].海洋学报(英文版),2015,34(12):93-101. |
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| 作者姓名： | 任林 杨劲松 郑罡 王隽 |
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| 作者单位： | 卫星海洋环境动力学国家重点实验室, 国家海洋局第二海洋研究所, 杭州 310012, 中国,卫星海洋环境动力学国家重点实验室, 国家海洋局第二海洋研究所, 杭州 310012, 中国,卫星海洋环境动力学国家重点实验室, 国家海洋局第二海洋研究所, 杭州 310012, 中国,卫星海洋环境动力学国家重点实验室, 国家海洋局第二海洋研究所, 杭州 310012, 中国 |
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| 基金项目： | The National Natural Science Youth Foundation of China under contract Nos 41306191 and 41306192; the National High Technology Research and Development Program of China (863 Program) of China under contract No. 2013AA09A505; the Scientific Research Fund of the Second Institute of Oceanography, State Oceanic Administration of China under contract No. JG1317. |
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| 摘 要： | This paper proposes two simple models, look-up table(LUT) model and empirical model, to directly retrieve significant wave height(Hs) using synthetic aperture radar(SAR) azimuth cutoff(λc). Both models aim at C-band VV, HH, VH, and HV single-polarization SAR images. The LUT model relates Hs to λc, while the empirical model relates Hs to both λc and SAR range-to-velocity(β). The LUT model coefficients are derived by simulation under different sea states and observation conditions, which depend on incidence angle(θ), wave direction(dw), and βbut are independent of polarization. The empirical model coefficients are obtained by fitting the collocated data,which only depend on polarization. To fit empirical model coefficients and validate the two models, C-band RADARSAT-2 fine quad-polarization(VV+HH+VH+HV) single-look complex(SLC) SAR images and collocated buoy data are collected. Retrieved Hs, using Yang model and the two models proposed in this paper from four kinds of polarization SAR data, are compared with buoy Hs. Results show that both LUT and empirical models have the capacity of retrieving Hs from C-band RADARSAT-2 co-polarization SAR data, while Yang model is not suitable for these kinds of SAR data. Moreover, the empirical model is also valid for cross-polarization SAR data showing clear ocean wave stripes.
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| 关 键 词： | SAR 单极化 有效波高 方位向截断波长 |
| 收稿时间： | 2014/11/12 0:00:00 |
| 修稿时间： | 6/5/2015 12:00:00 AM |
Significant wave height estimation using azimuth cutoff of C-band RADARSAT-2 single-polarization SAR images |
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| REN Lin,YANG Jingsong,ZHENG Gang and WANG Juan.Significant wave height estimation using azimuth cutoff of C-band RADARSAT-2 single-polarization SAR images[J].Acta Oceanologica Sinica,2015,34(12):93-101. |
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| Authors: | REN Lin YANG Jingsong ZHENG Gang and WANG Juan |
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| Institution: | State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China |
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| Abstract: | This paper proposes two simple models, look-up table (LUT) model and empirical model, to directly retrieve significant wave height (Hs) using synthetic aperture radar (SAR) azimuth cutoff (λc). Both models aim at C-band VV, HH, VH, and HV single-polarization SAR images. The LUT model relates Hs to λc, while the empirical model relates Hs to both λc and SAR range-to-velocity (β). The LUT model coefficients are derived by simulation under different sea states and observation conditions, which depend on incidence angle (θ), wave direction (dw), and β but are independent of polarization. The empirical model coefficients are obtained by fitting the collocated data, which only depend on polarization. To fit empirical model coefficients and validate the two models, C-band RADARSAT-2 fine quad-polarization (VV+HH+VH+HV) single-look complex (SLC) SAR images and collocated buoy data are collected. Retrieved Hs, using Yang model and the two models proposed in this paper from four kinds of polarization SAR data, are compared with buoy Hs. Results show that both LUT and empirical models have the capacity of retrieving Hs from C-band RADARSAT-2 co-polarization SAR data, while Yang model is not suitable for these kinds of SAR data. Moreover, the empirical model is also valid for cross-polarization SAR data showing clear ocean wave stripes. |
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| Keywords: | SAR single-polarization significant wave height azimuth cutoff |
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