Single lens joint transform correlator for high-resolution position location

Thomas J. Grycewicz

doi:10.1117/12.235669

15 March 1996 Single lens joint transform correlator for high-resolution position location

Thomas J. Grycewicz

Proceedings Volume 2752, Optical Pattern Recognition VII; (1996) https://doi.org/10.1117/12.235669
Event: Aerospace/Defense Sensing and Controls, 1996, Orlando, FL, United States

Abstract

This paper demonstrates the use of the single lens joint transform correlator (SLJTC) to precisely determine the target location for on-axis correlation with the targets superimposed. The SLJTC is a two stage processor with an input stage identical to the chirp-encoded joint transform correlator. The first stage computes the chirp-modulated joint power spectrum. The correlation signal in the chirp-encoded joint power spectrum is an amplitude encoded lens function of Fresnel zone plate. The correlation output is in the focal plane of this zone plate. The location of the center of the zone plate is proportional to the correlation location. The magnification of the correlation plane is determined by the chirp displacement. This is used to amplify small shifts in the correlation location. The SLJTC has been experimentally demonstrated with an output plane magnification of 6.3 and a peak-to-noise ratio of 16.7 dB.

Citation Download Citation

Thomas J. Grycewicz "Single lens joint transform correlator for high-resolution position location", Proc. SPIE 2752, Optical Pattern Recognition VII, (15 March 1996); https://doi.org/10.1117/12.235669

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KEYWORDS

Optical correlators

Joint transforms

Zone plates

Spatial light modulators

Modulation

Binary data

Fourier transforms

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