X-波段雷达近海海浪频谱反演的神经网络模型  

The retrieval of a nearshore wave frequency spectrum with X-band radar based on neural network

作　　者：王静 唐军武[1,3] 何宜军[4] 王鑫[3] 潘玉方[5] 

机构地区：[1]遥感科学国家重点实验室,北京100101 [2]中国科学院遥感应用研究所,北京100101 [3]国家海洋局国家海洋技术中心,天津300112 [4]中国科学院海洋研究所,山东青岛266071 [5]国家海洋局第二海洋研究所,浙江杭州310012

出　　处：《海洋学报》2013年第2期43-51,共9页

基　　金：海洋公益性行业科研专项(201005035);海洋可再生能源专项资金项目(GHME2011ZC04;GHME2012ZC02);基于中国科学院重大科研装备研制项目(YZ200724)

摘　　要：X-波段雷达作为国内海浪观测的一种新工具,在海浪频谱获取和有效波高反演方面仍存在较多问题。本文利用非线性回归方法,将现场实测浮标数据频谱和雷达一维图像谱分别与标准频谱模型进行拟合,发现浮标频谱和一维图像谱具有标准频谱的特征,能够较准确地获取相应的谱参数。提出了建立由雷达一维图像谱参数反演海浪频谱参数的神经网络模型,同时在模型中加入影像序列信噪比,进而反演有效波高,并将反演结果与现场实测数据和传统算法(建立影像序列信噪比与有效波高之间的线性回归方程)进行了对比,结果表明,获取谱参数的误差和反演有效波高的平均误差在20%以内,而传统算法计算有效波高平均误差在20%以上。As a new tool for ocean wave measurement interiorly, X-band radar can be used to provide sea state in formation and a wave field can be get form an image sequence. However, there are still some problems in the retrieval of wave frequency spectrum and significant wave height （Hs）. A nonlinear regression method was used to fit the in situ wave frequency spectrum and radar one-dimension image spectrum with standard PM, JONSWAP and TMA spectrum, and the basic form and the corresponding spectral parameters can be obtained accurately. Then, a generalized regression neural network model （GRNN） was introduced to retrieve the wave frequency spectral parameters from the one-dimensional radar image spectrum parameters. In the model, the signal-- to-- noise ratio （SNR） of the image sequence was added to set up a nonlinear relationship with Hs ,and the inversion results with the in situ data and the traditional algorithm result （the establishment of the linear regression equation between SNR and Hs） were compared. The results show that the mean error of spectral parameters and significant wave height are less than 20Y0, while the mean error of the traditional algorithm is more than 20%.

关 键 词：X-波段雷达 海浪频谱 有效波高 非线性拟合 神经网络 

分 类 号：P731.22[天文地球—海洋科学]