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Proceedings Paper

Applying time modulation to optical joint transform correlators to improve target detection in high-clutter/multiple-target environments
Author(s): Thomas J. Grycewicz
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Paper Abstract

A major limitation on the optical joint transform correlation (JTC) is that the output plane is dominated by unwanted self correlation products. Temporal encoding can be applied to the JTC to separate the correlation components in the output plane. This results in SNR/PSR improvement, removal of input plane location constraints, and elimination of the detection problems which result from multiple targets. A general implementation of this is the superheterodyne image mixer. The reference and scene input images are modulated at two different frequencies. Demodulation of the transform plane output at the sum or difference of the input frequencies results in the total separation of the correlation signals. This technique can be combined with spatial filtering to further improve system performance. For the case of square wave modulation, it is shown that both modulation and demodulation can be easily implemented. Potential performance improvement is demonstrated through computer simulation.

Paper Details

Date Published: 9 November 1993
PDF: 6 pages
Proc. SPIE 2026, Photonics for Processors, Neural Networks, and Memories, (9 November 1993); doi: 10.1117/12.163569
Show Author Affiliations
Thomas J. Grycewicz, Rome Lab. (United States)

Published in SPIE Proceedings Vol. 2026:
Photonics for Processors, Neural Networks, and Memories
Stephen T. Kowel; William J. Miceli; Joseph L. Horner; Bahram Javidi; Stephen T. Kowel; William J. Miceli, Editor(s)

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