| 摘要 |
<p>PURPOSE:To detect underground propagating characteristics of an electromagnetic wave at an excellent S/N ratio with high resolution by carrying out synchronism detection processing dispersively on an underground passed reception signal by a transmission signal and the 90-degree phase signal, carrying out inverse Fourier transformation on a real number part and an imaginary number part in Fourier transformation, and analyzing an obtained impulse waveform. CONSTITUTION:A reception signal outputted from a narrow-band amplifier 19 is branched off into two signals, and one signal is inputted to a synchronism detection output part 20, and synchronism detection is carried out with a single frequency (f0) given from a single frequency generator 3, and a phase component of this detection output is set as [e1(f)]. The other reception signal is also inputted to the synchronism detection output part 20, and synchronism detection is carried out with a signal whose single frequency (f0) is shifted by 90 degrees by a phase shifter 21, and a phase component of this detection output is set as [e2(f)]. These detection output pairs [e1(f) and e2(f)] are obtained by a plurality with every constant frequency, and are fed to an inverse Fourier transformer 22 as a real number part and an imaginary number part, and an impulse responsive waveform of a signal is obtained. This waveform is displayed (23) by changing a position of two boring holes, and an underground cross-sectional image is obtained.</p> |
