The model takes into consideration the dielectric constants of the materials of the trees and measures the signal strength for vertical and horizontal polarizations of the UWB antennas placed at various heights and distances from each other. The simulation uses a combination of Finite Difference Time Domain and ray tracing methods to simulate the UWB wave propagation. In this paper we test the performance of a simulation to model the propagation of an UWB signal in outdoor forested environment. These short duration waveforms are relatively immune to multi-path cancellation effects. For example in radar applications, these same pulses can provide very fine range resolution and precision distance and/or positioning measurement capabilities. Since UWB waveforms have very short time duration, they possess unique properties. UWB signals are characterized by extreme low powers and large bandwidths, which can be used for data, voice and video communication. An ultra wide band (UWB) signal is defined as any radiation in which the 3-dB bandwidth is greater than 25% of the center frequency.
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