Forward Modeling and Model Test of Ground-Penetrating Radar toward Typical Asphalt Pavement Distresses

Table 2

The length of echo’s flat segment obtained by GPR.

Void’s horizontal dimension (cm)	10	15	20	25	30
The length of the echo’s flat segment (cm)	10.15	15.25	20.36	25.51	30.55
Relative error (%)	1.50	1.67	1.80	2.04	1.83