Identification of Subsurface Thin Layers Using Cepstrum of GPR Data
A new method using pseudo-cepstrum to distinguish thin layers from ground penetrating radar(GPR)survey data is presented in this paper.The cepstrum here does not apply natural logarithmic operation on the spectrum.First,spectrum of the reflection coefficients series is estimated,using a Gaussian window to restrict the analysis band.It is found that the real part of the spectrum can be represented by cosine functions,while the image part can be represented by sine functions with reverse sign and same quefrencies.The quefrencies of the real part spectrum are the positions of the reflection coefficients.However,the cepstrum of a thin layer would look the same as that of a single-interface reflection.In order to tell the difference between these two situations,we calculate the real part pseudo-cepstrum of the reflection coefficient series and the peaks of the gamnitude cepstrum would indicate either a single-interface reflection or a thin layer reflection.According to the peak quefrencies of the cepstrum,the Gaussian window used before is forward-shifted and applied on the spectrum to obtain the image part of a forward-shifted spectrum.Then,the image part is backward shifted and added with the former real part of the spectrum.If the peak turns out to be the result of a single-interface reflection,the adding would make the quefrency component disappear on the gamnitude cepstrum of the sum.The residual would still be strong if the peak is a result of a thin layer reflection.
Z.L.Huang J.Z.Zhang
College of Marine Geosciences,Ocean University of China,China;School of Information Science and Tech College of Marine Geosciences,Ocean University of China,China
国际会议
Progress in Electromagnetics Research Symposium 2013(2013年电磁学研究新进展学术研讨会)
台北
英文
640-643
2013-03-01（万方平台首次上网日期，不代表论文的发表时间）