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.

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Prog Geophy ›› 2025, Vol. 40 ›› Issue (3) : 1258-1268. DOI: 10.6038/pg2025HH0442

Enhanced imaging of reinforcement by dual-polarization ground penetrating radar

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Abstract

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.

Key words

Ground Penetrating Radar (GPR) / Dual-polarization / Phase difference / Rebar detection / Signal-to-clutter ratio

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Hai LIU , Bin ZHANG , Feng DING , et al . Enhanced imaging of reinforcement by dual-polarization ground penetrating radar[J]. Progress in Geophysics. 2025, 40(3): 1258-1268 https://doi.org/10.6038/pg2025HH0442

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