A New Approach to Estimate Directional Spreading Parameters of a Cosine-2s Model
A New Approach to Estimate Directional Spreading Parameters of a Cosine-2s Model
复制标题
估计余弦 2s 模型方向传播参数的新方法
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
Jun Zhang
中科院分区：
文献类型：
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作者：
Shaosong Zhang;Jun Zhang
摘要为了基于余弦-2s方向扩散模型准确、一致地估计定向海的方向扩散参数和平均波向，提出了一种新的方法，即采用极大似然法（MLM）先估计定向扩散函数，再估计角傅里叶系数。由于MLM比传统方法中使用的定向傅里叶转移更能容忍估计的交叉谱误差，因此所提出的方法能够更准确和一致地估计方向扩展参数，并通过将所提出的方法和传统方法分别应用于数值模拟产生的时间序列和现场测量记录来验证和证实。
Abstract For accurate and consistent estimates of the directional spreading parameter and mean wave direction of directional seas based on a cosine-2s directional spreading model, a new approach is proposed, employing a maximum likelihood method (MLM) to estimate the directional spreading function and then the angular Fourier coefficients. Because an MLM is more tolerant of errors in the estimated cross-spectrum than a directional Fourier transfer used in the conventional approach, the proposed approach is able to estimate the directional spreading parameter more accurately and consistently, which is examined and confirmed by applying the proposed approach and conventional approach, respectively, to the time series generated by numerical simulation and recorded in field measurements.