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Proceedings Paper

Outdoor propagation analysis of ultrawideband signals
Author(s): Guy A. Schiavone; Parveen Wahid; Ravi Palaniappan; Judd Tracy; Eric Van Doorn; Benjamin Lonske
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Paper Abstract

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. UWB signals are characterized by extreme low powers and large bandwidths, which can be used for data, voice and video communication. Since UWB waveforms have very short time duration, they are relatively immune to multi-path cancellation effects. In this paper we test the performance of a simulation to model the propagation of an UWB signal in outdoor forested environment. The simulation uses a combination of Finite Difference Time Domain and ray tracing methods to simulate the UWB wave propagation. 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 results of the simulation are compared to measurements obtained from tests conducted at a wooded area in Seneca Creek State Park, Gaithersburg, Maryland. It was observed that upto 150 ft distance between the transmitter and receiver, the horizontally polarized antenna system gave better signal-to-noise ratio, but at greater distances the vertically polarized antenna system gave a better signal-to-noise ration performance. Three dimensional plots of the signal strengths and the signal-to-noise ratio for various transmitter and receiver distances are plotted for the system. These are compared with experimental results and the simulation closely matched the experimental data. The results of the simulation and measurements will be used for further developing an UWB location and tracking system for outdoor environments.

Paper Details

Date Published: 20 August 2003
PDF: 8 pages
Proc. SPIE 5077, Passive Millimeter-Wave Imaging Technology VI and Radar Sensor Technology VII, (20 August 2003); doi: 10.1117/12.488109
Show Author Affiliations
Guy A. Schiavone, Univ. of Central Florida (United States)
Parveen Wahid, Univ. of Central Florida (United States)
Ravi Palaniappan, Institute for Simulation and Training (United States)
Judd Tracy, Institute for Simulation and Training (United States)
Eric Van Doorn, Intelligent Automation, Inc. (United States)
Benjamin Lonske, Intelligent Automation, Inc. (United States)

Published in SPIE Proceedings Vol. 5077:
Passive Millimeter-Wave Imaging Technology VI and Radar Sensor Technology VII
Roger Appleby; Robert Trebits; David A. Wikner; James L. Kurtz, Editor(s)

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