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基于双树复小波包变换的地震信号分析方法
SEISMIC SIGNAL ANALYSIS BASED ON THE DUAL-TREE COMPLEX WAVELET PACKET TRANSFORM
【摘要】 尝试性地将一种双树复小波包变换方法应用于地震信号分析中 .复小波包变换综合了实小波包变换与连续复小波变换各自的优点 ,不但能提取信号的相位信息 ,而且选取与被分析信号相频特性相匹配的复小波包 ,可以对信号产生更好的“聚焦”作用 .本文描述了一种双树复小波包变换算法 ,并给出了模拟信号及实际地震记录的分析实例 .研究结果表明 ,双树复小波包变换是分析具有非线性相位地震信号的一种较为有效的方法 .
【Abstract】 We tried to apply the dual-tree complex wavelet packet transform in seismic signal analysis. The complex wavelet packet transform (CWPT) combine the merits of real wavelet packet transform with that of complex continuous wavelet transform (CCWT). It can not only pick up the phase information of signal, but also produce better “focalizing” function if it matches the phase spectrum of signals analyzed. We here described the dual-tree CWPT algorithm, and gave the examples of simulation and actual seismic signals analysis. As shown by our results, the dual-tree CWPT is a very effective method in analyzing seismic signals with non-linear phase.
【Key words】 dual-tree complex wavelet packet transform; instantaneous characteristics; seismic signal analysis;
- 【文献出处】 地震学报 ,Acta Seismologica Sinica , 编辑部邮箱 ,2004年S1期
- 【分类号】P315.63
- 【被引频次】9
- 【下载频次】294