1 September 1992 Two-dimensional acousto-optic processor using circular antenna array with a Butler matrix
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Optical Engineering, 31(9), (1992). doi:10.1117/12.58855
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.
Jim P. Y. Lee, "Two-dimensional acousto-optic processor using circular antenna array with a Butler matrix," Optical Engineering 31(9), (1 September 1992). http://dx.doi.org/10.1117/12.58855
JOURNAL ARTICLE
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KEYWORDS
Acoustics

Signal processing

Antennas

Acousto-optics

Bragg cells

Fourier transforms

Radar

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