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Research Study promises improved radar warning particular radar system, including the relative size of the targets the system must detect and the characteristics of the contaminants. The simulation presents a graphic display indicating how well the system will perform. The program produces color plots of the Fast Fourier Transform process in one- and two-dimensional formats, showing the effects of the contaminants. Researchers continue to improve the system, making it better able to address individual users' needs.

Radar Warning


n improved acoustoL optic radar warning receiver developed at Tech may provide future combat pilots with faster and more accurate warning of hostile radar activity. Optica] signal processing techniques allow the receiver to simultaneously handle a wide range of frequencies, and analyze several signals in parallel while providing frequency resolution precise enough to separate hostile signals

from friendly ones. A pair of acousto-optic cells, each with a specific processing task, form the heart of the radar-warning receiver. At the first cell, a transducer converts electronic signals from a potentially hostile radar emitters to acoustic energy. That energy is then coupled into the cell, where the acoustical energy affects its optical properties. Infrared laser light is then passed through the cell, which diffracts the light in a different direction for each center frequency it receives.

The diffracted light then strikes a second acoustooptic cell, which further diffracts the laser light so that the burst rate associated with each center frequency can be determined. Finally, detectors convert the diffracted light patterns to electrical signals which can be displayed. Researchers hope to enhance their system by adding the ability to automatically match the diffraction patterns against a library of known threat radars. They also plan to miniaturize the receiver. •

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GEORGIA TECH • Research 7 1

Georgia Tech Alumni Magazine Vol. 68, No. 02 1992