数字滤波在研究港内长周期波动中的应用
he Application of Digital Filter in The Study of Long-period Waves Inside Harbors
周期大于20s的长周期波浪一般难以直接观测，需要予以一定的手段对波浪的观测数据进行分离。本文采用窗函数法设计FIR低通数字滤波器，通过选择合适的滤波器单位抽样响应长度、确定合理的抽样频率 和截止频率 等参数，利用快速傅立叶变换和循环卷积等数学方法，建立了港内的长短波（周期）的分离模型，并在实际港口中得到了验证。
Since waves of periods greater than 20 seconds can hardly be observed directly, some effective means must be used to separate them from the observational wave data. In this paper, a FIR low pass digital filter was designed based on window function. By choosing appropriate number of response to unit sampling, determining reasonable sampling frequency and cut-off frequency, a numerical model was built for the separation between long period waves and short period waves. And Fast Fourier transform and circular convolution were used in calculating program to reduce the computational complexity. The model has been verified in actual ports.
张俞、冯卫兵、季小强
港湾工程水利工程基础科学工程基础科学
长周期波FIR低通数字滤波器快速傅立叶变换窗函数
long period wave，FIR low pass digital filter， Fast Fourier transform， window function
张俞,冯卫兵,季小强.数字滤波在研究港内长周期波动中的应用[EB/OL].(2006-11-22)[2025-08-06].http://www.paper.edu.cn/releasepaper/content/200611-588.点此复制
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