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Proceedings Paper

Demonstration of shifter-less beam steering in an ultra-wide bandwidth array antenna using synchronized chaos
Author(s): Jonathan N. Blakely; Billy R. Reed; Ned J. Corron; Mark T. Stahl; Krishna Myneni
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Paper Abstract

We demonstrate a new method for electronic beam steering in ultra-wide bandwidth array antennas based on synchronized chaos. Chaotic oscillators generate random-like waveforms that may be well-suited for highly unconventional ultra-wideband radar and spread-spectrum communication applications. The broadband and nonrepeating nature of chaos provides an ideal combination of high range resolution with no range ambiguity. Unlike true random sources, coupled chaotic oscillators can synchronize for coherent power combining. To steer the array, a small detuning is applied to each oscillator to slightly shift its natural frequency. Oscillators that are tuned to run faster will lead those tuned slower, providing a small time shift between the waveforms produced by each oscillator. The approach avoids the need for costly phase shifters or tunable true time delay elements. Our demonstration system consists of a linear array of four directionally coupled radio frequency chaotic oscillators, each of which produces a broadband waveform centered at 137 MHz. Each individual oscillator feeds one of four discone-type antennas spaced a third of a wavelength apart. We present far-field power level measurements characterizing beam formation and steering recorded on an outdoor test range. Our results suggest chaotic arrays could enable a new generation of low-cost, highperformance, ultra-wide bandwidth applications.

Paper Details

Date Published: 27 April 2010
PDF: 8 pages
Proc. SPIE 7669, Radar Sensor Technology XIV, 76690Q (27 April 2010); doi: 10.1117/12.850153
Show Author Affiliations
Jonathan N. Blakely, U.S. Army Aviation and Missile Research, Development, and Engineering Ctr. (United States)
Billy R. Reed, SAIC (United States)
Ned J. Corron, U.S. Army Aviation and Missile Research, Development, and Engineering Ctr. (United States)
Mark T. Stahl, U.S. Army Aviation and Missile Research, Development, and Engineering Ctr. (United States)
Krishna Myneni, U.S. Army Aviation and Missile Research, Development, and Engineering Ctr. (United States)


Published in SPIE Proceedings Vol. 7669:
Radar Sensor Technology XIV
Kenneth I. Ranney; Armin W. Doerry, Editor(s)

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