分数Fourier变换在可控震源信号处理中的应用  

THE APPLICATION OF FRACTIONAL FOURIER TRANSFORM IN THE PROCESSING OF VIBRATOR DATA

作　　者：耿春[1] 尹成[1] 张白林[1] 

机构地区：[1]西南石油大学资源与环境学院,成都610500

出　　处：《工程地球物理学报》2006年第6期427-436,共10页Chinese Journal of Engineering Geophysics

基　　金：国家高技术研究发展计划(863计划;编号:2003AA6021105);四川省应用基础研究项目(编号:01GY05131)资助

摘　　要：可控震源浅层地震勘探中,参考信号与接收信号都会受到环境噪声的污染。为了提高信号的信噪比,笔者采用一种新的时频分析工具———分数Fourier变换来对参考信号进行噪声的压制,它利用了可控震源信号———Chirp信号在某个分数阶Fourier变换上具有很好的能量集聚的特征,即表现为一个冲击函数,而噪声的能量均匀分布在整个时域平面内,在任何的分数阶Fourier域上均不会出现能量集聚。利用这一特征,可以分离出参考信号中的噪声,使时间延迟剖面的信噪比得到提高,改善了剖面质量。In the shallow layer seismic exploration of vibrator, reference signal and received signal are often influenced by environmental noise. To improve the signal/noise ratio of signal, the paper applys a new time-frequency analysis tool——Fractional fourier transform to compress the noise for reference signal, which applys the vibrator data——Chirp signal which has the feature a top function of strong energy collection in certain Fractional fourier transform, which the energy of noise distribute in the whole time domain plane averagely, so there is no energy collection in every domain of Fractional fourier transform. We can eliminate the noise from the reference signal, to enhance the signal/noise ratio of time delay profile and improve the quality of the profile.

关 键 词：可控震源 分数阶FOURIER变换 CHIRP信号 信噪比 

分 类 号：P631[天文地球—地质矿产勘探] P628.4[天文地球—地质学]