| DING Yingying,ZUO Juncheng,SHAO Weizeng,SHI Jian,YUAN Xinzhe,SUN Jian,HU Jiachen,LI Xiaofeng. 2019. Wave parameters retrieval for dual-polarization C-band synthetic aperture radar using a theoretical-based algorithm under cyclonic conditions. Acta Oceanologica Sinica, 38(5):21－31 |
| Wave parameters retrieval for dual-polarization C-band synthetic aperture radar using a theoretical-based algorithm under cyclonic conditions |
| 基于理论的气旋条件下双极化C波段合成孔径雷达波参数检测 |
| Received:February 20, 2019 |
| DOI：10.1007/s13131-019-1438-y |
| Key words:wave parameters synthetic aperture radar cyclonic condition |
| 中文关键词: 波浪参数 合成孔径雷达 气旋 |
| 基金项目:The National Key Research and Development Program of China under contract No. 2017YFA0604901; the National Natural Science Foundation of China under contract Nos 41806005 and 41776183; the Public Welfare Technical Applied Research Project of Zhejiang Province of China under contract No. LGF19D060003. |
| Author Name | Affiliation | E-mail | | DING Yingying | Marine Science and Technology College, Zhejiang Ocean University, Zhoushan 316000, China | | | ZUO Juncheng | Marine Science and Technology College, Zhejiang Ocean University, Zhoushan 316000, China | | | SHAO Weizeng | Marine Science and Technology College, Zhejiang Ocean University, Zhoushan 316000, China | shaoweizeng@zjou.edu.cn | | SHI Jian | College of Meteorology and Oceanography, National University of Defense Technology, Nanjing 210007, China | | | YUAN Xinzhe | National Satellite Ocean Application Service, Ministry of Natural Resources, Beijing 100081, China | | | SUN Jian | Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China | | | HU Jiachen | Marine Science and Technology College, Zhejiang Ocean University, Zhoushan 316000, China | | | LI Xiaofeng | Global Science and Technology, National Oceanic and Atmospheric Administration (NOAA) National Environmental Satellite, Data, and Information Service (NESDIS), College Park, MD 20740, USA | |
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| Abstract: |
| Theoretical-based ocean wave retrieval algorithms are applied by inverting a synthetic aperture radar (SAR) intensity spectrum into a wave spectrum, that has been developed based on a SAR wave mapping mechanism. In our previous studies, it was shown that the wave retrieval algorithm, named the parameterized first-guess spectrum method (PFSM), works for C-band and X-band SAR at low to moderate sea states. In this work, we investigate the performance of the PFSM algorithm when it is applied for dual-polarization c-band sentinel-1 (S-1) SAR acquired in extra wide-swath (EW) and interferometric wide-swath (IW) mode under cyclonic conditions. Strong winds are retrieved from six vertical-horizontal (VH) polarization S-1 SAR images using the c-band cross-polarization coupled-parameters ocean (C-3PO) model and then wave parameters are obtained from the image at the vertical-vertical (VV) polarization channel. significant wave height (SWH) and mean wave period (MWP) are compared with simulations from the WAVEWATCH-Ⅲ (WW3) model. The validation shows a 0.69 m root mean square error (RMSE) of SWH with a -0.01 m bias and a 0.62 s RMSE of MWP with a -0.17 s bias. Although the PFSM algorithm relies on a good quality SAR spectrum, this study confirms the applicability for wave retrieval from an S-1 SAR image. Moreover, it is found that the retrieved results have less accuracy on the right sector of cyclone eyes where swell directly affects strong wind-sea, while the PFSM algorithm works well on the left and rear sectors of cyclone eyes where the interaction of wind-sea and swell is relatively poor. |
| 中文摘要: |
| 将基于理论的反演算法应用于合成孔径雷达（SAR）强度谱的海浪反演，该算法时基于SAR成像机制开发的。在我们先前的研究中，已经表明，参数化第一猜测谱方法（PFSM），适用于低到中海况的C波段和X波段SAR海浪反演。在这项工作中，我们研究了气旋情况下，PFSM算法应用于在超宽幅（EW）和干涉宽幅（IW）模式成像的双极化C波段Sentinel-1（S-1） SAR的适用性。使用C波段交叉极化风速反演模型（C-3PO）模型从垂直-水平（VH） S-1 SAR图像中反演强风，然后从垂直-垂直图像反演台风浪参数。将有效波高（SWH）和平均波周期（MWP）与WAVEWATCH-Ⅲ （WW3）模型的模拟结果进行比较。验证显示SWH的均方根误差（RMSE）为0.69m和-0.01m偏差，MWP的均方根误差为0.62s和-0.17s偏差。虽然PFSM算法依赖于高质量的SAR频谱，但本研究证实了从S-1 SAR图像台风浪反演的适用性。此外，反演结果在旋风眼右侧扇区上的准确度较低，其中涌浪直接影响强风浪，而PFSM算法在旋风眼的左侧和后侧扇区上工作良好，其中风浪和涌浪的相互作用相对较弱。 |
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