Applying time modulation to optical joint transform correlators to improve target detection in high-clutter/multiple-target environments

Thomas J. Grycewicz

doi:10.1117/12.163569

9 November 1993 Applying time modulation to optical joint transform correlators to improve target detection in high-clutter/multiple-target environments

Thomas J. Grycewicz

Author Affiliations +

Proceedings Volume 2026, Photonics for Processors, Neural Networks, and Memories; (1993) https://doi.org/10.1117/12.163569
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

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.

Citation Download Citation

Thomas J. Grycewicz "Applying time modulation to optical joint transform correlators to improve target detection in high-clutter/multiple-target environments", Proc. SPIE 2026, Photonics for Processors, Neural Networks, and Memories, (9 November 1993); https://doi.org/10.1117/12.163569

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