铁路路基雷达探测数据的处理
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摘要
分析铁路路基雷达探测数据失真的主要原因,参考雷达探测在其他领域里的应用成果,设计相应的数据处理方法,最大限度地消除其影响。对轨枕中钢筋形成的多次波反射,采用抛物线拉冬变换法消除。对铁路沿线设施和通讯工具产生的随机噪声,采用小波域KL变换的方法去除。为弥补雷达探测剖面图对薄层和深层分辨率的不足,采用高通滤波和瞬时相位法加以提高。分别设计相应的数据处理算法步骤,采用VC和MATLAB混合编程技术实现。对2000年沪宁线路基雷达检测数据处理的结果表明:设计的数据处理方法具有计算速度快、通用性强、参数少的特点;处理后的雷达探测数据图像深部信号强、界面分层清晰,显示病害位置突出。
In this paper the reason for GPR data distortion and the results of GPR's application in some fields were analyzed.The data processing method adapted for GPR detection of railroad subgrade was designed to reduce the effects.Parabolic Radon transform was used for eliminating the effect from railway sleepers. KL transform in wavelet domain was applied for removing random noise from railroad facilities and communications.High-passing filtering and instantaneous phase were chosen to improve the resolution of deep and thin layers.The algorithms were designed separately to realize the data processing and programmed by a hybrid code of VC and MATLAB.The GPR data for Shanghai-Nanjing Railway subgrade in the year of 2000 was processed by using this algorithm.The results indicated that the data processing algorithm was good for the characteristics of high-speed computation, general-purpose,and less-parameters.After the processing,the GPR image showed strong signals in depth,clear interfaces,and defects positions.
In this paper the reason for GPR data distortion and the results of GPR's application in some fields were analyzed.The data processing method adapted for GPR detection of railroad subgrade was designed to reduce the effects.Parabolic Radon transform was used for eliminating the effect from railway sleepers. KL transform in wavelet domain was applied for removing random noise from railroad facilities and communications.High-passing filtering and instantaneous phase were chosen to improve the resolution of deep and thin layers.The algorithms were designed separately to realize the data processing and programmed by a hybrid code of VC and MATLAB.The GPR data for Shanghai-Nanjing Railway subgrade in the year of 2000 was processed by using this algorithm.The results indicated that the data processing algorithm was good for the characteristics of high-speed computation, general-purpose,and less-parameters.After the processing,the GPR image showed strong signals in depth,clear interfaces,and defects positions.
引文
[1]杨新安.路基检测新技术[M].北京:中国铁道出版社,2006.(YANG Xin′an.New Methods for Subgrade Detecting[M].Beijing:China Railway Publishing House,2006.inChinese)
[2]Hugenschmidt J.Railway Track Inspection Using GPR[J].Journal of Applied Geophysics,2000,43:147-155.
[3]Geraads Sophie.Applying a Wavenumber Notch Filter to Remove Interferences Caused by Railway Sleepers from aGPR Section[C]//Ninth International Conference on Ground Penetrating Radar.Koppenjan:Proceedings ofSPIE,2002,4758:715-718.
[4]郭秀军,韩宇,孟庆生,等.铁路路基病害无损检测车载探地雷达系统研制及应用[J].中国铁道科学,2006,27(5):139-144.(GUO Xiujun,HAN Yu,MENG Qingsheng,et al.Manufacture and Application of the On-Board Ground Penetrat-ing Radar for Non-Invasive Inspection of Railway Subgrade Defects[J].China Railway Science,2006,27(5):139-144.in Chinese)
[5]刘财.勘探地震资料处理新方法及新技术[M].北京:科学出版社,2006.31-34.
[6]李晋平,邵丕彦,谷牧.地质雷达在铁路隧道工程质量检测中的应用[J].中国铁道科学,2006,27(2):56-59.(LI Jinping,SHAO Piyan,GU Mu.Application and Analysis of GPR in Railway Tunnel Engineering Quality In-spection[J].China Railway Science,2006,27(2):56-59.in Chinese)
[7]苏红旗,杨峰,王均双,等.地质雷达信号采样定时控制[J].中国铁道科学,2005,26(3):60-63.(SU Hongqi,YANG Feng,WANG Junshuang,et al.Timing Control of Geological Radar Signals Sampling[J].China Railway Science,2005,26(3):60-63.in Chinese)
[8]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.(YANG Xin-an.Railroad Substructure and Problem of Yuntaishan Tunnel Inspection Using GPR[J].GeologicalScience and Technology Information,2002,21(4):86-88.in Chinese)
[9]Wang Yanghua.Multiple Attenuation:Coping with the Spatial Truncation Effect in the Radon Transform Domain[J].Geophysical Prospecting,2003,51:75-87.
[10]董长虹.Matlab小波分析工具箱原理与应用[M].北京:国防工业出版社,2004.108-154.
[11]Bleisten N.Mathematics of Multidimensional Seismic Imaging,Migration,and Inversion[M].New York:Spring-er-Verlag,2001.
[12]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.(YANG Xin′an,GAO Yanling.GPR Inspection for Shanghai-Nanjing Railway Trackbed[J].Chinese Journal ofRock Mechanics and Engineering,2004,23(1):116-119.in Chinese)
[2]Hugenschmidt J.Railway Track Inspection Using GPR[J].Journal of Applied Geophysics,2000,43:147-155.
[3]Geraads Sophie.Applying a Wavenumber Notch Filter to Remove Interferences Caused by Railway Sleepers from aGPR Section[C]//Ninth International Conference on Ground Penetrating Radar.Koppenjan:Proceedings ofSPIE,2002,4758:715-718.
[4]郭秀军,韩宇,孟庆生,等.铁路路基病害无损检测车载探地雷达系统研制及应用[J].中国铁道科学,2006,27(5):139-144.(GUO Xiujun,HAN Yu,MENG Qingsheng,et al.Manufacture and Application of the On-Board Ground Penetrat-ing Radar for Non-Invasive Inspection of Railway Subgrade Defects[J].China Railway Science,2006,27(5):139-144.in Chinese)
[5]刘财.勘探地震资料处理新方法及新技术[M].北京:科学出版社,2006.31-34.
[6]李晋平,邵丕彦,谷牧.地质雷达在铁路隧道工程质量检测中的应用[J].中国铁道科学,2006,27(2):56-59.(LI Jinping,SHAO Piyan,GU Mu.Application and Analysis of GPR in Railway Tunnel Engineering Quality In-spection[J].China Railway Science,2006,27(2):56-59.in Chinese)
[7]苏红旗,杨峰,王均双,等.地质雷达信号采样定时控制[J].中国铁道科学,2005,26(3):60-63.(SU Hongqi,YANG Feng,WANG Junshuang,et al.Timing Control of Geological Radar Signals Sampling[J].China Railway Science,2005,26(3):60-63.in Chinese)
[8]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.(YANG Xin-an.Railroad Substructure and Problem of Yuntaishan Tunnel Inspection Using GPR[J].GeologicalScience and Technology Information,2002,21(4):86-88.in Chinese)
[9]Wang Yanghua.Multiple Attenuation:Coping with the Spatial Truncation Effect in the Radon Transform Domain[J].Geophysical Prospecting,2003,51:75-87.
[10]董长虹.Matlab小波分析工具箱原理与应用[M].北京:国防工业出版社,2004.108-154.
[11]Bleisten N.Mathematics of Multidimensional Seismic Imaging,Migration,and Inversion[M].New York:Spring-er-Verlag,2001.
[12]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.(YANG Xin′an,GAO Yanling.GPR Inspection for Shanghai-Nanjing Railway Trackbed[J].Chinese Journal ofRock Mechanics and Engineering,2004,23(1):116-119.in Chinese)
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