x 103
3
2
1
0
1
2
Soil Resistivity = 25 ohm-m
No Soil Relaxation
Local Wavelet Frequency = 400 MHz
3
Round Trip Attenuation = 49 dB/m
4
0
10
20
30
40
50
Time (ns)
x 103
3
Soil Resistivity = 25 ohm-m
2
No Soil Relaxation
Local Wavelet Frequency = 400 MHz
Round Trip Attenuation = 47 dB
1
0
1
2
3
0
10
20
30
40
50
Time (ns)
b. Reflections from purely resistive soils.
Figure 12 (cont'd). Model 400-MHz wavelets before and after round-trip propaga-
tion within 1 m of ground characterized by the soil parameters measured. The
wavelets reflect from an interface for which R = 1 (eq. 6), which only reverses the
phase of the wavelets so that all wavelet distortion and attenuation are due to
propagation.
18
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