摘要
S变换虽兼备短时傅里叶变换和小波变换的优点,但基本小波固定,在薄互层识别方面受到较大限制。广义S变换,通过引入λ,p两个参数对S变换中的高斯窗函数进行改造,时频分辨率得到了明显提高。本文在对广义S变换方法原理进一步研究的基础上,应用VC++在Qt平台上编写了广义S变换时频分析程序,并构造平稳信号和非平稳信号进行了对比分析,凸显了广义S变换的时频聚焦性。最后,应用该方法对实际测井信号进行了时频谱分析,取得了良好效果。
S transform（ST） is combined with the advantages of short--time Fourier trans- form（STFT） and wavelet transform（WT）. However, the basic wavelet of ST is so fixed that it is very limited in identifying the thin inter--bed strata. As generalized S transform （GST）, due to introduce ,l and p parameters to change the window function of ST, the time --frequency resolution is improved greatly. The program of GST time--frequency analysis is written by VC＋＋ under platform of Qt after deeply studying the principle of GST,and it reflects the high time--frequency focusing properties of GST through comparing the sta- tionary signal and non--stationary signal. Finally, the method is used to analyze the time-- frequency spectrum of the actual logging signals, and obtain a good result.
出处
《工程地球物理学报》
2014年第1期60-65,共6页
Chinese Journal of Engineering Geophysics
基金
国家科技重大专项项目(编号:2011ZX05024-001-03)资助
关键词
测井信号
广义S变换
时频谱分析
logging signal
generalized S transform
time--frequency spectrum analysis
