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FIG. 1. Depiction of a ground penetrating radar system as a series of N-port networks. The P_t,t port and the P_r,r port of the antenna system refer to the transmitting antenna feed port and the receiving antenna feed port, respectively. Note that the antenna networks include the soil that lies within the reactive near-field region of the antennas (i.e., the zone up to about a half wavelength in depth beneath the antennas).

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