一、问题的提出我国《海洋调查规范》(1975)的“海浪频谱的分析”节中,曾规定了传统频谱估计方法的一些参数,例如采样步长是0.5,0.75,1秒;自由度是50～60等等。由于当时海浪资料的限制,只比较了谱窗对谱质量的影响,规定自相关法采用Hamming窗是最佳,周期图法采用矩形窗。在这窗函数下进行谱估计时,步长的选取,自由度的确定,只分析少数几组资料,故这些参数确定是参阅了Wilson(1970)和Kinsman(1965)等文献。因此,这些 I. PROBLEM PROBLEMS Some parameters of the conventional spectral estimation methods have been stipulated in the section “Analysis of the Wave Spectrum” of the “Regulations of Oceanographic Survey” (1975). For example, the sampling step size is 0.5, 0.75, and 1 second; and the degree of freedom is 50 ~ 60 and so on. Due to the limitation of the sea wave data at that time, only the spectral window was compared to the spectral quality. It was stipulated that the auto-correlation method adopted the Hamming window is the best and the periodic graph method used the rectangular window. When estimating the spectrum under this window function, the choice of the step size, the determination of the degree of freedom, and the analysis of only a few sets of data, the determination of these parameters is made by reference to Wilson (1970) and Kinsman (1965). So, these