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A noncoherent optical-correlation detector of the stored reference type is described. The correlator performs real-time correlation of multiple delayed signals with the stored reference without a priori knowledge of the signal delays. The correlator makes use of real-time integration, thereby making it unnecessary to record received signals prior to correlation. An experimental version of the correlator is described, its performance is analyzed, and the predicted performance is compared with the observed performance and found to agree to within 3 dB. A signal-processing gain of 20 dB is obtained with the experimental version of the correlator.
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J. Parks (1965) studied this question.
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