TABLE I
DIELECTRIC CONSTANTS OF COMMON MATERIALS
| Material | Dielectric constant | Velocity (mm/ns) |
|---|---|---|
| atmosphere | 1 | 300 |
| water | 81 | 30 |
| concrete | 5-8 | 55-120 |
| Sand (dry) | 3-6 | 120-170 |
| Sand (wet) | 25-30 | 55-60 |
| pitch | 3-5 | 134-173 |
Figure 1.
GPR system detection equipment
Figure 2.
Principles of geological radar detection
Figure 3.
GPR image of tunnel ejection
Figure 4.
Structure chart Faster RCNN
Figure 5.
Structure chart of RPN
Figure 6.
Same border regression of IoU
Figure 7.
Network model training process