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A Modeling Method for Quasi-monostatic Stepped Frequency Ground Penetrating Radar
doi: 10.12000/JR18096
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Abstract
Ground Penetrating Radar (GPR) is a widely used non-destructive testing tool. Constructing an appropriate forward model is crucial for GPR to perform a full-waveform inversion of layered media. In this paper, a forward model for the quasi-monostatic Stepped-Frequency GPR (SFGPR) is proposed. In the model, the GPR and its interaction with the layered medium are represented as a linear equation in which the effects of the antennas are represented by a set of frequency-dependent transfer functions. To verify the accuracy of the proposed model, the authors constructed a quasi-monostatic SFGPR in a laboratory condition and performed a full-waveform inversion of the measurement signals of plasterboard and woodblock with known thickness. In the inversion results, the thickness estimation errors of the plasterboard and woodblock are not more than 0.3 mm, indicating that the proposed forward model has a very high accuracy. The inversion performances of the quasi-monostatic and monostatic SFGPR are further compared for the layered medium constructed with plasterboard and woodblock, which has a small permittivity difference. The results show that the quasi-monostatic SFGPR can obtain more accurate inversion parameters. By estimating the Signal to Noise Ratio (SNR) of the reflected signal from the interface, it is found that the SNR obtained by the quasi-monostatic configuration is 10 dB higher than that of the monostatic; therefore, the quasi-monostatic GPR has the better inversion performance. -
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References
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- Figure 1. Modeling diagram for the quasi-monostatic ground penetrating radar
- Figure 2. Configurations of quasi-monostatic and monostatic GPR
- Figure 3. Fitting errors of the simplified model and original model
- Figure 4. Validating the accuracy of the quasi-monostatic model with the thickness-known plasterboard
- Figure 5. Comparison of the measured and simulated signal for plasterboard and woodblock
- Figure 6. Models used to calculate the reflections on the interface
- Figure 7. The comparison of the SNR between the monostatic and quasi-monostatic GPR