一、前言 从理论上讲,当给定任何一个周期为2π的函数f(t),只要它能满足狄里赫莱条件,则均可分解为一个平均值和许多个成谐波关系的正弦成份,其中组成f(t)的每个正弦型量称为函数f(t)的调和分量。实用调和分析的主要目的就是为探求各调和分量的量值及它们间的相互关系,并通过谱分析(振幅谱与位相潜)找出在不同个观测数据的情况下,应取前多少 I. INTRODUCTION In theory, when given any function f (t) with a period of 2π, as long as it satisfies the condition of Dirichlet, it can be decomposed into an average value and a number of sinusoids of harmonic relationship Component, where each sinusoidal component of f (t) is called the harmonic component of the function f (t). The main purpose of practical harmonic analysis is to find out the magnitude of each harmonic component and their interrelationship and to find out how much should be taken in the case of different observed data by spectral analysis (amplitude spectrum and phase potential)