几种重排算法在地震信号处理中的实验分析  

Experiments and analysis in seismic data processing with several kinds of reassignment methods

作　　者：周竹生[1] 陈高祥[1] 

机构地区：[1]中南大学地球科学与信息物理学院,湖南长沙410083

出　　处：《煤田地质与勘探》2013年第1期72-77,共6页Coal Geology & Exploration

摘　　要：阐述了时频分析技术中重排算法的基本思想,给出了部分重排算法的局部能量重心表达式;设计了两个数值实验,利用几种重排算法对单道地震信号进行了计算和分析比较。结果表明:重排算法不仅能有效抑制交叉项,同时也能提高时频聚集性,从而获得更理想的局部信号特征。其中以重排Spectrogram分布的时频聚集能力最佳,尤其适合于突出主频信号;重排平滑伪Wigner-Ville分布同样也能够获得较理想的时频效果,但稍弱于前一种方法;重排伪MH分布的时频聚集性相对较差,没有对分散的能量进行有效的重新分配处理。重排算法因其突出的时频聚集能力,应用在地震剖面中可以得到更加细致的瞬时频率特征。The main idea of reassignment method in time-frequency analysis is presented and some expressions used to compute the accurate location of the local energy gravity center are given;then two numerical experiments are presented to show how these reassignment methods work individually as used to process single-trace seismic data.Based on the experiments,some conclusions are drawn that the reassignment methods can not only effectively reduce cross-terms,but also lead to a good time-frequency concentration.Compared with others,the reassignment spectrogram has the best potential for ideal time-frequency concentration,especially when the dominant frequencies are required to be underlined.The reassignment smoothing pseudo Wigner-Ville distribution can also achieve perfect effects though it is a little worse than the former one.The pseudo Margenau-Hill distribution is the worst of the three,since it fails to relocate the dispersive energy to the calculated center.A pretty precise instantaneous frequency section can be produced when the reassignment method is applied to deal with seismic signals.

关 键 词：时频分析 重排算法 地震信号处理 非平稳信号 双线性 

分 类 号：P631[天文地球—地质矿产勘探]