Crossed-dipole antennas can be used to reduce clutter and improve the signal-tonoise<br>ratio of ground penetrating radar (GPR) surveys, depending upon field conditions<br>and the targets of interest. The crossed-dipole antenna consists of transmit and receive<br>antennas oriented orthogonal to each other, and is sensitive to field components oriented<br>parallel to the long axis of the receive antenna. These cross-polarized components can be<br>introduced by scattering from subsurface targets or may be composed of scattered crosspolarized<br>components present in the field incident on the target. The physical shape and<br>composition of targets will influence the polarization of the scattered field, and this<br>enables cross-pole and co-pole antenna configurations to discriminate between different<br>classes of targets for clutter removal. The crossed-dipole antenna configuration also<br>improves isolation of the receive antenna from the direct arrival of the transmit antenna.<br>The improved isolation and ability to discriminate between different targets can therefore<br>result in an improved signal-to-noise ratio.


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