探地雷达信号的KL变换处理分析
|
摘要
实测探地雷达记录中存在大量的噪声干扰,有时致使目标信号难以分辨,为提高雷达剖面的信噪比,主要探讨KL变换在消除干扰噪声方面的有效性.在说明KL变换原理的基础上,通过Matlab软件进行编程计算,对时域有限差分法获得的探地雷达模拟剖面和现场实测雷达数据进行处理;再对处理前后的雷达图像进行对比分析.经过处理分析可知,KL变换可压制模拟数据中边界反射信号和棱角点的绕射波、抑制和消除实测雷达剖面中的高频杂波噪声信号,从而突出有效信号,增强有效信号的相对强度,这提高了探地雷达剖面的分辨率和反演解释精度.
There is large amount of noise in the ground penetrating radar(GPR) record,which causes the target signal to be distinguished with difficulty at times.In order to increase SNR of GPR sections,the validity of KL transform to remove noise in GPR record was discussed.On the basis of KL transform theory,the calculating program was written out in Matlab environment.The GPR modeling record of finite difference time domain method and real data were processed by KL transform,the results were analyzed and compared with original records.According to the analyzing results,KL transform suppress boundary reflection signals and corner diffraction signals of modeling data,and remove high frequency noise in GPR real data.After the transformation the effective signals are intensified,and resolution of GPR sections and inversion accuracy are improved.
There is large amount of noise in the ground penetrating radar(GPR) record,which causes the target signal to be distinguished with difficulty at times.In order to increase SNR of GPR sections,the validity of KL transform to remove noise in GPR record was discussed.On the basis of KL transform theory,the calculating program was written out in Matlab environment.The GPR modeling record of finite difference time domain method and real data were processed by KL transform,the results were analyzed and compared with original records.According to the analyzing results,KL transform suppress boundary reflection signals and corner diffraction signals of modeling data,and remove high frequency noise in GPR real data.After the transformation the effective signals are intensified,and resolution of GPR sections and inversion accuracy are improved.
引文
[1]杨天春,周勇,李好.超前探测中探地雷达应用与结果的处理分析[J].工程地质学报,2010,18(6):971-975.Yang T C,Zhou Y,Li H.Use and analysis of ground penetrationradar for forecasting geological conditions in highway tunneling[J].Journal of Engineering Geology,2010,18(6):971-975.
[2]张春城,周正欧.浅地层步进频率探地雷达的一种预处理方法[J].信号处理,2004,20(5):507-511.Zhang C C,Zhou Z O.A pre-processing method for steppedfrequency ground penetrating radar of shallow subsurface detection[J].Signal Processing,2004,20(5):507-511.
[3]李东升,李振勇.KL变换本征滤波技术在海洋地震资料处理中的应用[J].石油地球物理勘探,2009,44(增1):49-51.Li D S,Li Z Y.Application of KL transformation intrinsic filteringtechnique in marine seismic data processing[J].Oil GeophysicalProspecting,2009,44(sup1):49-51.
[4]杨天春.基于高阶模式瑞利波与雷达波的模拟及应用研究[D].长沙:湖南大学,2006.Yang T C.The research and application of wave propagationsimulations base on higher modes Rayleigh wave and electromagneticwave[D].Changsha:Hunan University,2006.
[5]朱建群,关辉辉,周勇,等.探地雷达在黔东浅变质岩区隧道地质预报中的应用[J].湖南科技大学学报(自然科学版),2010,25(4):59-62.Zhu J C,Guan H H,Zhou Y,et al.Application of ground probingradar in geological forecast for tunnel construction in epimetamorphicrock zone of QianDong[J].Journal of Hunan University of Science&Technology(Natural Science Edition),2010,25(4):59-62.
[6]李和志,贺建清,赵永清.综合超前地质预报方法在观音山隧道施工中的应用[J].矿业工程研究,2011,26(4):49-52.Li H Z,He J Q,Zhao Y Q.Application of integrated geologicalforecast techniques to Guanyinshan tunnel[J].Mineral EngineeringResearch,2011,26(4):49-52.
[7]张志禹,刘亚丽.基于小波域KL变换的探地雷达信号处理[J].煤田地质与勘探,2007,35(2):70-72.Zhang Z Y,Liu Y L.Signal processing of ground penetrating radarbased on KL transform in wavelet domain[J].Coal Geology andExploration,2007,35(2):70-72.
[8]Levey A,Lindenbaum M.Sequential Karhuren-Loeve basisextraction and its application to images[J].IEEE Transactions onImage Processing,2000,9(8):1371-1374.
[9]Fang N S,Ying L A.Stability analysis of FDTD to UPML for timedependent Maxwell equations[J].Science in China Series A:Mathematics,2009,52(4):794-816.
[10]Zeng Z F,Wu F S,Huang L,et al.The adaptive chirplettransform and its application in GPR target detection[J].AppliedGeophysics,2009,6(2):192-200.
[2]张春城,周正欧.浅地层步进频率探地雷达的一种预处理方法[J].信号处理,2004,20(5):507-511.Zhang C C,Zhou Z O.A pre-processing method for steppedfrequency ground penetrating radar of shallow subsurface detection[J].Signal Processing,2004,20(5):507-511.
[3]李东升,李振勇.KL变换本征滤波技术在海洋地震资料处理中的应用[J].石油地球物理勘探,2009,44(增1):49-51.Li D S,Li Z Y.Application of KL transformation intrinsic filteringtechnique in marine seismic data processing[J].Oil GeophysicalProspecting,2009,44(sup1):49-51.
[4]杨天春.基于高阶模式瑞利波与雷达波的模拟及应用研究[D].长沙:湖南大学,2006.Yang T C.The research and application of wave propagationsimulations base on higher modes Rayleigh wave and electromagneticwave[D].Changsha:Hunan University,2006.
[5]朱建群,关辉辉,周勇,等.探地雷达在黔东浅变质岩区隧道地质预报中的应用[J].湖南科技大学学报(自然科学版),2010,25(4):59-62.Zhu J C,Guan H H,Zhou Y,et al.Application of ground probingradar in geological forecast for tunnel construction in epimetamorphicrock zone of QianDong[J].Journal of Hunan University of Science&Technology(Natural Science Edition),2010,25(4):59-62.
[6]李和志,贺建清,赵永清.综合超前地质预报方法在观音山隧道施工中的应用[J].矿业工程研究,2011,26(4):49-52.Li H Z,He J Q,Zhao Y Q.Application of integrated geologicalforecast techniques to Guanyinshan tunnel[J].Mineral EngineeringResearch,2011,26(4):49-52.
[7]张志禹,刘亚丽.基于小波域KL变换的探地雷达信号处理[J].煤田地质与勘探,2007,35(2):70-72.Zhang Z Y,Liu Y L.Signal processing of ground penetrating radarbased on KL transform in wavelet domain[J].Coal Geology andExploration,2007,35(2):70-72.
[8]Levey A,Lindenbaum M.Sequential Karhuren-Loeve basisextraction and its application to images[J].IEEE Transactions onImage Processing,2000,9(8):1371-1374.
[9]Fang N S,Ying L A.Stability analysis of FDTD to UPML for timedependent Maxwell equations[J].Science in China Series A:Mathematics,2009,52(4):794-816.
[10]Zeng Z F,Wu F S,Huang L,et al.The adaptive chirplettransform and its application in GPR target detection[J].AppliedGeophysics,2009,6(2):192-200.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心