小波分析及其MATLAB实现

上传者: lfs12356 | 上传时间: 2019-12-21 20:07:09 | 文件大小: 530KB | 文件类型: zip
小波变换系数等值线图 时间序列(Time Series)是地学研究中经常遇到的问题。在时间序列研究中,时域和频域是常用的两种基本形式。其中,时域分析具有时间定位能力,但无法得到关于时间序列变化的更多信息;频域分析(如Fourier变换)虽具有准确的频率定位功能,但仅适合平稳时间序列分析。然而,地学中许多现象(如河川径流、地震波、暴雨、洪水等)随时间的变化往往受到多种因素的综合影响,大都属于非平稳序列,它们不但具有趋势性、周期性等特征,还存在随机性、突变性以及“多时间尺度”结构,具有多层次演变规律。对于这类非平稳时间序列的研究,通常需要某一频段对应的时间信息,或某一时段的频域信息。显然,时域分析和频域分析对此均无能为力。

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