Experimental systems implementation of a hybrid optical-digital correlator |
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| Authors: | Sharp J H MacKay N E Tang P C Watson I A Scott B F Budgett D M Chatwin C R Young R C Tonda S Huignard J P Slack T G Collings N Pourzand A R Duelli M Grattarola A Braccini C |
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| Affiliation: | Department of Mechanical Engineering, Laser and Optical Systems Engineering Centre, University of Glasgow, UK. j.sharp@mech.gla.ac.uk |
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| Abstract: | A high-speed hybrid optical-digital correlator system was designed, constructed, modeled, and demonstrated experimentally. This correlator is capable of operation at approximately 3000 correlations/s. The input scene is digitized at a resolution of 512 x 512 pixels and the phase information of the two-dimensional fast Fourier transform calculated and displayed in the correlator filter plane at normal video frame rates. High-fidelity reference template images are stored in a phase-conjugating optical memory placed at the nominal input plane of the correlator and reconstructed with a high-speed acousto-optic scanner; this allows for cross correlation of the entire reference data set with the input scene within one frame period. A high-speed CCD camera is used to capture the correlation-plane image, and rapid correlation-plane processing is achieved with a parallel processing architecture. |
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