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HHT-based spectral reassignment analysis of full-data migrated GPR data
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DOI：10.1088/1361-6501/ae646f.png)
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Abstract
En 中文
Spectral analysis of ground-penetrating radar (GPR) data has been extensively employed to characterize subsurface structures and material properties. Nevertheless, conventional spectral analyses are typically conducted in the time domain, thereby limiting their capability for depth-specific interpretation. In this paper, a case investigation focusing on the detection of air-filled and water-filled voids beneath a roadbed is presented. By applying Hilbert-Huang transform (HHT)-based spectrum reassignment to GPR data processed using full-data Kirchhoff migration, we demonstrate that frequency-domain characteristics can be effectively analyzed in the depth domain. Single-trace spectral analysis of the migrated data indicates that, compared with migrations using different grid densities, full-data migration preserves a larger proportion of the valid signal. Moreover, relative to the pre-migration data, it provides a more accurate spectral response to subsurface geological features. These results confirm both the feasibility and effectiveness of performing spectral analysis on fully migrated GPR data. The HHT-based spectral reassignment method further improves the energy concentration and resolution of the time-frequency representation. When applied to the fully migrated gathers, frequency slices at different bands can be extracted. In the dominant 500 MHz slice, the energy associated with both air-filled and water-filled cavity models is strongly concentrated within the strata and cavity regions. This approach effectively suppresses noise while clearly delineating the geometry and precise location of subsurface geological structures. The practical performance of the proposed method was further validated through a field case study involving the detection of a subsurface stormwater pipe, thereby demonstrating the applicability and accuracy of the combined full-data migration and HHT-based spectral reassignment approach for depth-frequency interpretation.
Keywords:
ground penetrating radar (gpr)
full-data migration
hilbert-huang transform (HHT)
spectral reassignment
road inspection
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