표 2. | Table 2. 그림 4에서 금속관 표적신호에 대한 도달시간과 첨두값의 정확성 비교 | Accuracy comparison of the arrival time and the peak value of the metal pipe signals in Fig. 4.

Metal pipe signal	Arrival time [ns]	Relative error [%]
Underground medium	Peak value [mV/m]
Homogeneous ground (h=0)	21.83	-
	−0.828	-
Inhomogeneous ground #1 (h=0.5, lc=5 cm)	21.95	0.55
	−0.972	17.42
Inhomogeneous ground #2 (h=1.0, lc=10 cm)	22.12	1.32
	−0.786	5.06
Inhomogeneous ground #3 (h=1.5, lc=15 cm)	22.40	2.61
	−0.647	21.88