Phase-encoded joint transform correlator to reduce the influence of extraneous signals.
A technique to reduce the influence of the dc and the complex-conjugate correlation signals that are inherent in a joint transform correlator is proposed. The key part of this technique is the use of a phase mask. The mask contributes only extraneous signals, so the influence of the signals is reduced. The desirable correlation signal is not affected, and its shape is retained. Computer simulations confirm the performance of the proposed phase-encoded joint transform correlator.
Nomura
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Department of Opto-Mechanics, Faculty of Systems Engineering, Wakayama University, 930 Sakaedani, Wakayama 640, Japan.