基于SWOT卫星数据的海浪谱反演研究  

Wave Spectrum Inversion Research Based on SWOT Satellite Data

作　　者：姜肖宇 孟俊敏 罗偲 JIANG Xiaoyu;MENG Junmin;LUO Cai(First Institute of Oceanography,Ministry of Natural Resources,Qingdao 266061,China;College of Oceanography and Space Informatics,China University of Petroleum,Qingdao 266580,China)

机构地区：[1]自然资源部第一海洋研究所,青岛266061 [2]中国石油大学(华东)海洋与空间信息学院,青岛266580

出　　处：《遥测遥控》2024年第6期48-54,共7页Journal of Telemetry,Tracking and Command

基　　金：国家自然科学基金(低空远距离条件下海态与目标一体化雷达探测理论与方法U26207)。

摘　　要：SWOT (Surface Water and Ocean Topography,地表水和海洋地形)卫星是新一代海洋观测卫星,其采用了小入射角下的合成孔径雷达(SAR)观测体制,为海浪探测提供了一种新的手段。本研究在前人SAR海浪谱反演研究的基础上,针对SWOT卫星数据开展了海浪谱反演算法的适用性研究,讨论了风速、风向、主波波向对海浪谱反演的影响。利用欧洲中期天气预报中心(ECMWF,European Center for Medium-range Weather Forecasts)的ERA5 (第五代再分析数据集)对反演的有效波高进行了验证。结果表明:在风速为7 m/s~9 m/s、9 m/s~11 m/s、>11 m/s时,反演的有效波高均方根误差(RMSE)分别为0.30 m、0.19 m、0.64 m,散度指数(SI)分别为16.74%、7.03%、19.61%,可以证明SWOT卫星作为小入射角SAR具有反演海浪谱与海浪参数的潜力。The Surface Water and Ocean Topography(SWOT) satellite is a new generation ocean observation satellite.It is used to provide a new method for wave detection by adopting the synthetic aperture radar(SAR) observation system at a small incidence angle.Based on previous studies on SAR wave spectrum inversion,the applicability of the wave spectrum inversion algorithm for SWOT satellite data is studied.The effects of wind speed,wind direction,and main wave direction on wave spectrum inversion are discussed.The effective wave height of the inversion is verified using the ERA5 dataset from the European Center for Mediumrange Weather Forecasts(ECMWF).The results show that the root mean square errors(RMSE) of the effective wave height inversion are 0.30 m,0.19 m,and 0.64 m at wind speeds of 7-9 m/s,9-11 m/s,and >11 m/s,respectively.The scatter indices(SI) are 16.74%,7.03%,and 19.61%,respectively.It can be proven that the SWOT satellite,as a small incidence angle SAR,has the potential to invert wave spectra and wave parameters.

关 键 词：SWOT卫星 海浪谱反演 MPI方法 

分 类 号：TP75[自动化与计算机技术—检测技术与自动化装置] TP722.6[自动化与计算机技术—控制科学与工程]