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Enhanced imaging of reinforcement by dual-polarization ground penetrating radar
Hai LIU, Bin ZHANG, Feng DING, JianHui LI, Xu MENG, Chao LIU, RuiGe SHI
Prog Geophy ›› 2025, Vol. 40 ›› Issue (3) : 1258-1268.
PDF(3869 KB)
PDF(3869 KB)
Enhanced imaging of reinforcement by dual-polarization ground penetrating radar
Ground Penetrating Radar (GPR) has been widely applied to the detection of buried targets. Polarimetric GPR possesses superior capability in identifying and characterizing elongated subsurface targets than conventional single-channel GPR. In this study, a mathematical demonstration is given that, for elongated metal cylinders with a diameter-to-wavelength ratio of roughly 0.05 to 0.26, there exists a phase difference of about 90° between the scattered signals in two orthogonal polarized channels (HH and VV). Furthermore, a polarimetric phase-difference imaging method is proposed to enhance the reflection signals of steel rebar within the concrete by phase-shifting the VV component of -90° and then subtracting it from the HH component. Comparing with traditional single polarization GPR and the direct subtraction between the orthogonal single-polarization radar data, the proposed method can significantly improve the signal-to-clutter ratio of the buried steel rebar in the results of numerical simulations, laboratory experiments, and field experiments.
Ground Penetrating Radar (GPR) / Dual-polarization / Phase difference / Rebar detection / Signal-to-clutter ratio
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