5 July 1995 Signature features in time frequency of simple targets extracted by ground penetrating radar
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Abstract
We study the scattering interaction of electromagnetic pulses of short duraction with two targets of simple shape. The targets are metal spheres buried at different depths in sand contained in an indoor sandbox of length and width of about 5 m and depth of 2 m. The spectrum of the backscattered echo is determined from measured data when the target is illuminated by an impulse radar system. In general, however, the signature features extracted when the antenna and the target are located in different half-spaces having different electrical properties are distorted by multiple scattering becomes less significant and, as the distance increases, the backscattering signature will ultimately approach that of the target in free space. We examine here the effect of multiple scattering on the target's signature will ultimately approach that of the target in free space. We examine here the effect of multiple scattering on the target's signatures when they are buried at different depths. In particular, we examine how the signature features evolve in time, both the primary signature feature and the subsequent features caused by multiple scattering. This is carried out using a pseudo-Wigner distribution (PWD) with a Gaussian time-window, having its width properly adjusted to suppress the interference of cross-terms in the PWD, yet retaining the desired property of concentrating the extracted features in the time-frequency domain. The results serve to assess the possibility if identifying subsurface targets using a ground penetrating radar (GPR).
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Hans C. Strifors, Hans C. Strifors, Steffan Abrahamson, Steffan Abrahamson, B. Brusmark, B. Brusmark, Guillermo C. Gaunaurd, Guillermo C. Gaunaurd, } "Signature features in time frequency of simple targets extracted by ground penetrating radar", Proc. SPIE 2485, Automatic Object Recognition V, (5 July 1995); doi: 10.1117/12.213082; https://doi.org/10.1117/12.213082
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