Research Article
A Method for Cavity Scale Estimation Based on Ground-Penetrating Radar (GPR) Explorations: An Experimental Study
Table 1
Relationship between the variables of underground electrical characteristics, GPR exploration, and frequency.
| | Measurement variable | Permittivity | Conductivity | Frequency | | Low | ⟶ | High | Low | ⟶ | High | Low | ⟶ | High |
| | Velocity of electromagnetic wave | Fast | ⟶ | Slow | | — | | | — | | | Attenuation | High | ⟶ | Low | Low | ⟶ | High | Low | ⟶ | High | | Depth of investigation | Shallow | ⟶ | Deep | Deep | ⟶ | Shallow | Deep | ⟶ | Shallow | | Wavelength | Long | ⟶ | Short | | — | | Long | ⟶ | Short | | Resolution | Low | ⟶ | High | | — | | Low | ⟶ | High |
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