去除探地雷达信号中不相关噪声的方法
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摘要
根据有效信号在相邻道之间在波形和能量上有相关性这一特点,作者改进了常规KL变换只能提取水平相关信号的不足,使用小波域上的KL变换对探地雷达剖面进行滤波,不仅使倾斜轴和弯曲轴的到了加强,而且在低信噪比时,有效地区分出有效信号和干扰信号,提高了雷达剖面的分辨率.本文运用铁路沪宁线路基检测的数据,使用该方法滤波,其处理后的剖面更能有效地反映出路基病害的信息.
Based on characteristic of relevance of wave form and energy of effective signal among neighbouring traces,the author fills up the deficiency in extraction of horizontal coherent signal with traditional KL transform and uses KL transform in wavelet domain to filter GPR data.Not only are axis of tilt and bending axis intensified,but also signal is effectively distinguished from interference signal whe signal-to-noise ratio is low.So the resolution of GPR plot is improved.After the GPR data from exploration of Shanghai-Nanjing railway subgrade is filtered with the method mentioned above,it is easier for the GPR plot based on it to reflect the subgrade problems.
引文
[1]岳承祺,唐权钧.用KL变换提高多道地震记录的信噪比[J].石油地球物理勘探,1988,23(5):560-568.
    [2]昊剑华,刘贵忠.基于小波变换域上的KL变换的地震信号去噪方法[J].信号处理,1997,13(4).
    [3]杨新安,高艳灵,刘征.论铁路既有线路基检测[J].岩石力学与工程学报,2003,22(增):2363-2366.
    [4]杨新安.云台山隧道与两端线路路基病害的探地雷达检测[J].地质科技情报,2002,21(4):86-88.
    [5]杨新安,高艳灵.沪宁铁路翻浆冒泥病害的地质雷达检测[J].岩石力学与工程学报,2004,23(1):116-119.

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