Parameterized first-guess spectrum method for retrieving directional spectrum of swell-dominated waves and huge waves from SAR images  

作　　者：孙建 管长龙 

机构地区：[1]Physical Oceanography Laboratory

出　　处：《Chinese Journal of Oceanology and Limnology》2006年第1期12-20,共9页中国海洋湖沼学报（英文版）

基　　金：Supported by the High-Tech Research and Development Program of China (863 Program, No. 2001AA633070 2003AA604040)the National Basic Research Program of China (973 Program. No. 2005CB422307)

摘　　要：A method to retrieve ocean wave spectra from SAR images, named Parameterized First-guess Spectrum Method （PFSM）, was proposed after interpretation of the theory to ocean wave imaging and analysis of the drawbacks of the retrieving model generally used. In this method, with additional information and satellite parameters, the separating wave-number is first calculated to determine the maximum wave-number beyond which the linear relation can be used. The separating wave-number can be calculated using the additional information on wind velocity and parameters of SAR satellite. And then the SAR spectrum can be divided into SAR spectrum of wind wave and of swell according to the result of separating wave-number. The portion of SAR spectrum generated by wind wave, is used to search for the most suitable parameters of ocean wind wave spectrum, including propagation direction of ocean wave, phase speed of dominating wave and the angle spreading coefficient. The swell spectrum is acquired by directly inversing the linear relation of ocean wave spectrum to SAR spectrum given the portion of SAR spectrum generated by swell. We used the proposed method to retrieve the ocean wave spectrum from ERS-SAR data from the South China Sea and compared the result with altimeter data. The agreement indicates that the PFSM is reliable.从 SAR 检索海浪系列的一个方法想象，命名 ParameterizedFirst 猜测光谱方法(PFSM ) ，在理论的解释以后被建议到海浪成像和通常使用的检索模型的缺点的分析。在这个方法，与另外的信息和卫星参数，分开的波浪数字首先被计算决定线性关系能在以外被使用的最大的波浪数字。separatingwave 数字能用风速度和参数 ofSAR 卫星的另外的信息被计算。然后 SAR 光谱能根据分开波浪数字的结果被划分成风波浪并且 swell 的 SAR 光谱。SAR 光谱的部分由风波浪产生了，被用来寻找海洋风波浪光谱的最合适的参数包括海浪的繁殖方向，分阶段执行统治传播的波浪和角度的速度系数。swell 光谱被获得由直接到给 SAR 光谱的部分的 SAR 光谱的海浪光谱的线性关系产生了由的 inversing 胀大。我们使用了建议方法从华南海从 ERS-SAR 数据检索海浪光谱并且把结果与高度表数据作比较。协议显示 PFSM 是可靠的。

关 键 词：Synthetic Aperture Radar ocean wave spectrum SAR retrieval method 

分 类 号：P731.22[天文地球—海洋科学]