Figure 8 - available via license: Creative Commons Attribution 3.0 Unported
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... response spectrum of square-wave is relatively cleaner; we attribute the difference in skin depth ( figure 7); a high frequency component play a role at the short offset which is a shortage for the m-sequence, that is, the m-sequence is relatively unsuitable for short offset due to the lack of high frequency components. The SNR of the voltage response at 2400 m offset was extremely low due to the adjacent power line and the source signal was drowned by strong 50 Hz noise, as shown in figure 8. At long offset, the air wave travels faster and arrives first, manifest as an initial impulse in the identified earth impulse response (figure 9(a) and (b)). ...
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