摘要
为了克服标准S变换对时频谱能量的"加权效应",构造了一种归一化窗S变换。它的窗函数满足能量归一化条件,减少了对高频分量的加权效应,而且可通过参数调整窗函数时宽。文中推导了归一化窗S正反变换的运算实现。模型信号的分析表明,归一化窗S变换在不损失时频分辨率的前提下,更能客观地反映非平稳信号中不同频率成分的能量分布特征,并可通过参数调整其时频分辨率。对实际地震信号的分析发现,它能更加真实地描述实际地震信号的高频衰减现象。
In order to avoid the ＂weighting from the time-frequency spectral energy, a effect＂ of the existing S transform （ST） suffered normalized window based S transform （NWST） is presented. The window function of NWST possesses the normalized energy and reduces the ＂weighting effect＂ for spectral energy at the higher frequency. The temporal width of NWST window can be adjusted by an additional parameter. Numerical implementation of NWST and its inverse transform are introduced. Simulation results of several signal models demonstrate that NWST can reflect the spectral energy distribution of different frequency components while maintaining the good time-frequency resolution. In addition, the time-frequency resolution of NWST can be further adjusted by the parameter. analysis. Results show that NWST can detect the NWST is applied in the real seismic signal high frequency attenuation of seismic signal using ST.
出处
《数据采集与处理》
CSCD
北大核心
2009年第4期458-463,共6页
Journal of Data Acquisition and Processing
基金
国家高技术研究发展计划"八六三"计划(2006AA09A102-12)资助项目
国家自然科学基金(40774064)资助项目
关键词
时频分析
S变换
归一化窗S变换
时频分辨率
地震信号衰减
time-frequency analysis
S transform
normalized window based S transform
time- requency resolution
seismic signal attenuation
