几种时频分析方法的比较及应用A Comparison of Time-Frequency Analysis Methods and Their Applications
董建华;顾汉明;张星;
摘要(Abstract):
地震信号属于非平稳信号,常规傅立叶变换方法不能刻画任一时刻的频率成分,无法对其进行全面的分析。时频分析方法将一维时域信号变换到二维的时频平面,全面反映地震信号的时频联合特征。本文介绍了短时傅立叶变换、连续小波变换、Wigner-Ville分布、Cohen类分布四种时频分析方法,通过理论合成信号试算,从时间分辨率、频率分辨率,以及对多频率成份信号适应能力等方面阐述了这四种方法的优缺点,进一步分析比较了这四种方法的特点及应用效果。
关键词(KeyWords): 时频分析;短时傅立叶变换;连续小波变换;Wigner-Ville分布;Cohen类分布
基金项目(Foundation):
作者(Authors): 董建华;顾汉明;张星;
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