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21 September 2004 Effect of ground variability on clutter and false alarm in landmine detection
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Experimental measurements have shown that the use of a multi-layered elastic media is necessary for transfer function numerical modeling. The present work deals with the effect of variability of ground properties (compression and shear wave speeds, density, attenuation and thickness of the layers) on the acoustic-seismic transfer function (admittance) and on clutter in landmine detection. Analysis is performed on the planes of parameters of the ground in a wide frequency range for all angles of incidence. Matrix approach is used to increase the accuracy of computations. It is revealed that the acoustic-seismic transfer function is sensitive to ground properties and that small variations in the shear speed may cause strong variation in the acoustic-seismic transfer function. Results of outdoor measurements of the acoustic-seismic transfer function are presented and a correlation between high magnitudes of the acoustic-seismic transfer function in certain frequency ranges (false alarms) and moisture content on the surface is revealed. A simple model explaining the correlation between moisture content in the upper layer, acoustic-seismic transfer function and ground properties is suggested.
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Margarita S. Fokina, Vladimir N. Fokin, and James M. Sabatier "Effect of ground variability on clutter and false alarm in landmine detection", Proc. SPIE 5415, Detection and Remediation Technologies for Mines and Minelike Targets IX, (21 September 2004);

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