A novel synthetic aperture radar scattering model for sea surface with breaking waves

作     者：Xiaochen Wang Yuxin Hu Bing Han Wei Tian Chunhua Zhang Xiaochen Wang;Yuxin Hu;Bing Han;Wei Tian;Chunhua Zhang

作者机构：Aerospace Information Research InstituteChinese Academy of SciencesBeijing 100094China Key Laboratory of Technology in Geo-spatial Information Processing and Application SystemChinese Academy of SciencesBeijing 100190China The box51111Beijing 100190China 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2022年第41卷第4期

页      面：138-145页

核心收录：

学科分类：08[工学] 0707[理学-海洋科学] 0816[工学-测绘科学与技术] 

基　　金：The National Natural Science Foundation of China under contract No.4197060692。 

主　　题：synthetic aperture radar scattering model sea surface wave breaking 

摘      要：In this study a novel synthetic aperture radar(SAR)scattering model for sea surface with breaking waves is proposed.Compared with existing models,the proposed model considers an empirical relationship between wind speed and wave breaking scattering to present the contribution of wave breaking.Moreover,the scattering weight factor p,and wave breaking rate q,are performed to present the contribution of the quasi-specular scattering term,Bragg scattering term,and wave breaking scattering term to the total scattering from the sea surface.To explore the modeling accuracy of sea-surface scattering,a simulated normalized radar cross-section(NRCS)and measured NRCS are compared.The proposed model generated the simulated NRCS and a matching GF-3 dataset was used for the measured NRCS.It was revealed that the performance of the VV polarization of our model was much better than that of HH polarization,with a correlation of 0.91,bias of-0.14 dB,root mean square error(RMSE)of 1.26 dB,and scattering index(SI)of-0.11.In addition,the novel model is explored and compared with the geophysical model of CMODs and satellite-measured NRCS from GF-3 SAR wave mode imagery.For an incidence angle 40°–41°,the relationship between the NRCS and wind speed,relative wind direction is proposed.As with the SAR-measured NRCS,the performance of VV polarization was much better than HH polarization,with a correlation of 0.99,bias of-0.25 dB,RMSE of 0.64 dB,and SI of-0.04.