基于高分三号SAR图像的海面起伏场准线性反演OA
A Quasi-linear Inversion Algorithm for Retrieving Sea Surface Elevation from GF-3 SAR Images
通过对海面起伏场进行分析,不仅可获取常用的海浪统计参数,还能细致描述单个波浪的特性、检测异常巨浪、研究波群与波组的演变过程,从而更精准地描述大面积非均匀海况.该文基于准线性模型,提出一套适用于高分三号合成孔径雷达(SAR)图像的海面起伏场反演方案.该方案不依赖外部辅助数据,可在10 s内完成单景SAR数据的海面起伏场快速反演,并有效提取沿距离向传播的波浪信息.通过3种典型海况下的反演实例,体现出该方法在提取最大波高、识别波群与波组结构等方面的优势.进一步将2405景高分三号波模式SAR图像的反演结果与ERA5再分析海浪谱及高度计实测数据进行对比.结果显示,反演有效波高与ERA5数据的均方根误差为0.48 m.在有效波高低于3 m的中低海况下,反演有效波高与ERA5及高度计数据均保持良好一致性.该研究为基于高分三号SAR的海况信息快速监测与分析提供了有效工具.
Sea surface elevation is crucial for characterizing individual waves,wave groups,and freak waves,offering an accurate representation of inhomogeneous sea states.This study presents a quasi-linear inversion strategy for retrieving sea surface elevation from GF-3 Synthetic Aperture Radar(SAR)images.The algorithm enables rapid inversion within 10 s per scene without the need for external data and effectively resolves range-traveling waves.Case studies conducted under three distinct sea states demonstrate its ability to extract maximum wave heights and identify wave groups.Additionally,inversion results from 2405 GF-3 wave mode SAR images following quality control are compared with ERA5 reanalysis spectra and altimeter data.The comparisons reveal that the retrieved Significant Wave Height(SWH)has a root mean square error of 0.48 m compared with ERA5 data.In low-to-moderate sea states,with significant wave heights below 3 m,the retrieved SWH shows strong consistency with ERA5 spectra and altimeter measurements.This algorithm serves as an effective tool for rapid monitoring and analysis of sea states using GF-3 SAR.
房玉鑫;范陈清;孟俊敏;张杰;闫秋双
中国石油大学(华东) 青岛 266580自然资源部第一海洋研究所 青岛 266061自然资源部第一海洋研究所 青岛 266061中国石油大学(华东) 青岛 266580||自然资源部第一海洋研究所 青岛 266061中国石油大学(华东) 青岛 266580
信息技术与安全科学
合成孔径雷达高分三号海面起伏场准线性模型快速反演
Synthetic Aperture Radar(SAR)GF-3Sea surface elevationQuasi-linear modelRapid inversion
《雷达学报》 2026 (2)
746-758,13
国家自然科学基金(42206178)The National Natural Science Foundation of China(42206178)
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