| 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].,1995,14(2):38-41,32 |
| 二维滤波技术在浅地层地声信号处理中的应用 |
| The application of 2-D FFT filtering in shallow layer underground acoustic signal processing |
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| 中文摘要: |
| 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测灵敏度的主要原因之一．在频率域或时间域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． |
| 英文摘要: |
| 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. |
| DOI：10.11684/j.issn.1000-310X.1995.02.009 |
| 中文关键词: 地声 二维滤波 反射波 |
| 英文关键词: Underground acoustics 2-D filtering Reflected wave |
| 基金项目:国家自然科学基金 |
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| 摘要点击次数: 2696 |
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