基于S变换的地震信号降噪方法研究  

The Research of Seismic Signal Denoising Method Based on Improved S Transform

作　　者：张鹤翔[1] 李红光[2] 赵宜宾[1] 李宁[2] 

机构地区：[1]防灾科技学院基础部,河北三河065201 [2]中国地震应急搜救中心工程部,北京100049

出　　处：《数学的实践与认识》2014年第9期144-149,共6页Mathematics in Practice and Theory

基　　金：中央高校基本科研业务费专项基金(ZY20120206)

摘　　要：S变换在分析非平稳信号时能有效地反映出频率随时间的变化,但由于其窗函数是固定不变的,在实际中应用受到了限制.从基本理论出发,推导出一种改进的S变换形式,并对合成信号分别进行傅立叶变换、s变换和改进的S变换,通过对比发现:改进的s变换方法能够更好地分辨非平稳信号的频率特性,比S变换具有更高的分辨率.最后应用改进的s变换方法对地震背景噪声数据进行了去噪处理,取得了较好的结果.S transform can effectively reflect the frequency changes with time in the analysis of non-stationaxy signal, because of the window function is fixed, the application is restricted. In this paper, starting from the basic theory, to derive an improved generalized S transform formula, processing the synthetic signals respectively with Fourier transform, S transform and improved S transform, the comparison results prove that： the frequency characteristics of improved S transform method can better distinguish from the non-steacly signal with a higher resolution than S transform. Application of improved S transform method in the denoising of seismic background noise data, and achieved good results.

关 键 词：S变换 非平稳信号分析 

分 类 号：TN911.4[电子电信—通信与信息系统]