钢筋加固区介质层电磁特性反演的系统辨识算法
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摘要
本文研究了机场道面钢筋加固区介质层电磁特性的反演问题。机场道面下钢筋的强反射回波严重影响道面介质层电磁特性的反演,为此本文将基于曲波变换的钢筋回波抑制技术引入到道面介质层电磁特性的反演算法中,即首先基于曲波变换进行钢筋回波抑制,而后基于改进的系统辨识算法实现钢筋加固区介质层电磁特性的反演。改进的系统辨识算法是在传统算法中的基础上,考虑了雷达发射信号带宽内的频率对道面介质层介电常数虚部的影响,从而进一步实现了介质层介电常数与电导率的同时反演。仿真结果证明了本文算法的有效性。
The Electromagnetic(EM) property inversion of rebar-reinforced zone in runways is studied in this paper.The strong rebar echo will severely affect the EM inversion of the media layer in runways.So the rebar suppression technique based on the Hyp-curvelet is introduced to the EM inversion algorithm.Firstly,the Hyp-curvelet is used to suppress the rebar echoes,and then EM properties are estimated based on the improved system identification,in which the effect of the frequency components within the band width on the imaginary part of the permittivity is considered.Therefore the conductivity and permittivity of the media layer can be intensively obtained.The simulation results demonstrate the validity of the method proposed in this paper.
The Electromagnetic(EM) property inversion of rebar-reinforced zone in runways is studied in this paper.The strong rebar echo will severely affect the EM inversion of the media layer in runways.So the rebar suppression technique based on the Hyp-curvelet is introduced to the EM inversion algorithm.Firstly,the Hyp-curvelet is used to suppress the rebar echoes,and then EM properties are estimated based on the improved system identification,in which the effect of the frequency components within the band width on the imaginary part of the permittivity is considered.Therefore the conductivity and permittivity of the media layer can be intensively obtained.The simulation results demonstrate the validity of the method proposed in this paper.
引文
[1]翁兴中,蔡良才.机场道面设计[M].北京:人民交通出版社,2007:159-220.Weng X.Z.,Cai L.C..Runways Pavement Design[M].Beijing:China Communications Press,2007:159-220.(inChinese)
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[4]钟羽中,吴仁彪,刘家学.基于GPR的机场跑道钢筋回波检测与抑制[J].信号处理,2011,27(10):1509-1514.Zhong Y.Z.,Wu R.B.,Liu J.X..Rebar Echo Detectionand Suppression in Runway Using GPR[J].Signal Pro-cessing,2011,27(10):1509-1514.(in Chinese)
[5]刘喜武,刘洪铭.高分辨率Radon变换方法及其在地震信号处理中的应用[J].地球物理学进展,2004,19(1):8-15.Liu X.W.,Liu H.M..High Resolution Radon Transformand its Application in Seismic Signal Processing[J].Progress in Geophysics,2004,19(1):8-15.(in Chi-nese)
[6]钟燕辉.层状体系介电特性反演及其工程应用[D].大连,大连理工大学,2006.Zhong Y.H..Inverse Analysis of Dielectric Properties ofLayered Structures and the Application in Engineering[D].Dalian,Dalian University of Technology,2006.(in Chinese)
[7]Li J.,and Wu R.B..An efficient algorithm for timedelay estimation[J].IEEE Transactions on Signal Pro-cessing,August 1998,46:2231-2235.
[8]Antonis G.Modeling Ground Penetrating Radar Using GprMax[J].Construction and Building Material,2005,19(10):755-762.
[2]Zhang R.F.,Tadeusz J.U..Physical wavelet frame de-noising[J].Geophysics,2003,68(1):225-231.
[3]孙学文,陈文超,高静怀,包乾宗.小波域强波衰减方法研究[J].石油地球物理勘探,2008,43(1):22-28.Sun X.W.,Chen W.C.,Gao J.H.,Bao Q.Z..Study onattenuation of strong surface wave in wavelet domain[J].OGP,2008,43(1):22-28.(in Chinese)
[4]钟羽中,吴仁彪,刘家学.基于GPR的机场跑道钢筋回波检测与抑制[J].信号处理,2011,27(10):1509-1514.Zhong Y.Z.,Wu R.B.,Liu J.X..Rebar Echo Detectionand Suppression in Runway Using GPR[J].Signal Pro-cessing,2011,27(10):1509-1514.(in Chinese)
[5]刘喜武,刘洪铭.高分辨率Radon变换方法及其在地震信号处理中的应用[J].地球物理学进展,2004,19(1):8-15.Liu X.W.,Liu H.M..High Resolution Radon Transformand its Application in Seismic Signal Processing[J].Progress in Geophysics,2004,19(1):8-15.(in Chi-nese)
[6]钟燕辉.层状体系介电特性反演及其工程应用[D].大连,大连理工大学,2006.Zhong Y.H..Inverse Analysis of Dielectric Properties ofLayered Structures and the Application in Engineering[D].Dalian,Dalian University of Technology,2006.(in Chinese)
[7]Li J.,and Wu R.B..An efficient algorithm for timedelay estimation[J].IEEE Transactions on Signal Pro-cessing,August 1998,46:2231-2235.
[8]Antonis G.Modeling Ground Penetrating Radar Using GprMax[J].Construction and Building Material,2005,19(10):755-762.
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