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ISSN Druckformat: 0040-2508
ISSN Online: 1943-6009
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HOMOMORPHIC SIGNAL PROCESSING ALGORITHM OF GROUND PENETRATION RADAR
ABSTRAKT
The actual problem of measuring the thickness of the near-surface layers of the soil using ground penetrating radar systems under stringent restrictions on the minimum length of a video pulse and under the presence of the noise caused by resonance effects in antenna and multiple reflections of the sounding signal from the boundaries between media has been studied. Traditional extreme correlation signal processing methods do not provide for the resolution less than half of the total duration of the pulse. Overcoming this limitation is possible by using nonlinear methods, for example the homomorphic signal processing. The possibility of high resolution of subsurface stratified media boundaries by using non-linear homomorphic digital signal processing of reflections is proved theoretically and experimentally. The proposed method has used the non-linear spectrum transform of ultra-wideband sounding signals. It allows getting resolution approximately to 5 % of pulse duration instead of limitation of the traditional correlation method of signal processing. The fast Fourier transform (FFT) algorithm is used to calculate the amplitude spectrum of the signal, the result is subjected to logarithms and then the inverse Fourier transform is computed, to get a signal cepstrum containing the probe signal and digital signal delay. The analysis of cepstrum at a relatively high signal to noise ratio allows calculating the estimate of the thickness of the layer. The results of simulations and experimental data processing are also shown. The problem of influence of the noise on identification of the subsurface objects has also been discussed.
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Sytnik O., Pochanin G., Masalov S., Ruban V., Kholod P., Method for measurement of mobile objects coordinates by video-pulse radar, RADIOFIZIKA I ELEKTRONIKA, 23, 2, 2018. Crossref
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Sytnik Oleg, Masalov Sergey, Kholod Pavel, Pochanin Gennadiy, Ruban Vadim, UWB Technology for Detecting Alive People Behind Optically Opaque Obstacles, 2018 9th International Conference on Ultrawideband and Ultrashort Impulse Signals (UWBUSIS), 2018. Crossref