Elimination of direct wave in GPR signal via 2-D physical wavelet frame

摘要

Direct wave is one of the major interferences to ground penetrating radar (GPR) signal, and the elimination of direct wave is a key technology for shallow object identification. In view of the features of direct wave in the GPR signal, it can be eliminated by taking 2-D physical wavelet as the basic wavelet to conduct wavelet transform on the GPR signal and selecting proper wavelet scale to estimate direct wave interference. The method of 2-D physical wavelet frame has been verified to be effective through processing the actually-detected data of two GPRs. Compared to 2-D continuous directed wavelet transform, it embraces the advantages of small memory occupancy and fast calculation speed.