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Optical Engineering

Two-dimensional acousto-optic processor using circular antenna array with a Butler matrix
Author(s): Jim P. Y. Lee
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Paper Abstract

A two-dimensional acousto-optic signal processor is shown to be useful for providing simultaneous spectrum analysis and direction finding of radar signals over an instantaneous field of view of 360 deg. A system analysis with emphasis on the direction-finding aspect of this new architecture is presented. The peak location of the optical pattern provides a direct measure of bearing, independent of signal frequency. In addition, the sidelobe levels of the pattern can be effectively reduced using amplitude weighting. Performance parameters, such as mainlobe beamwidth, peak-sidelobe level, and pointing error, are analyzed as a function of the Gaussian laser illumination profile and the number of channels. Finally, a comparison with a linear antenna array architecture is also discussed.

Paper Details

Date Published: 1 September 1992
PDF: 13 pages
Opt. Eng. 31(9) doi: 10.1117/12.58855
Published in: Optical Engineering Volume 31, Issue 9
Show Author Affiliations
Jim P. Y. Lee, Dept. of National Defence (Canada)


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