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二维滤波技术在浅地层地声信号处理中的应用
引用本文:李亚安,穆林,武延详.二维滤波技术在浅地层地声信号处理中的应用[J].应用声学,1995,14(2):38-41,32.
作者姓名:李亚安  穆林  武延详
作者单位:西北工业大学航海工程学院!西安710072
摘    要:在浅层地下声探测系统中,地表直达波对物体反射波的干扰是限制探灵敏度的主要原因之一,在频率域或时间都很难将它们与反射波信号分离,本文采用二维FFT滤波技术,利用直达波和反射波视速度的差异,在频率域和速度域进行滤波,有效地消除了直达波的干扰,提高了系统的探测灵敏度。

关 键 词:地声  二维滤波  反射波  地声探测系统

The application of 2-D FFT filtering in shallow layer underground acoustic signal processing
Li yaan,Mu lin and Wu yanxiang.The application of 2-D FFT filtering in shallow layer underground acoustic signal processing[J].Applied Acoustics,1995,14(2):38-41,32.
Authors:Li yaan  Mu lin and Wu yanxiang
Institution:Northwestern polytechnical university, college of marine engineering, Xian 710072;Northwestern polytechnical university, college of marine engineering, Xian 710072;Northwestern polytechnical university, college of marine engineering, Xian 710072
Abstract:In the shallow layer underground acoustic detection system, the direct wave travelling on the ground surface is the main cause of restricting the detection sensitivity.It is hard to distinguish thc reflected wave from the direct wave in both the frequency and the time domains. By means of 2-D FFT filtering, the interference of the direct wave is removed in both domains. The sensitivity of the detection system is therely improved.
Keywords:Underground acoustics  2-D filtering  Reflected wave
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