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Acousto-Optic Adaptive Processing (AOAP).
Phase rept. Sep 81-Oct 82,
GENERAL ELECTRIC CO SYRACUSE NY ELECTRONICS LAB
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The conventional approach for implementing adaptive cancellers to reject radar interference is to build a separate electronic loop for each required degree of freedom. The process consists of cross-correlating the radar signal with interference samples received by wide-beamwidth auxiliary antennae. These correlation values are then used to adjust the interference waveforms in amplitude and phase so that a precise subtraction of the offending interference can be accomplished. An optical implementation of such a processor is the subject of the effort described in this report. In the optical configuration which has been developed, the required operations of multiplication and time delay are provided by acousto-optical AO delay lines. The required time integration is provided by an image converter having a suitable delay time. In the optical realization, each resolvable optical element along the AO delay lines used as input modulators represents an additional delay time degree of freedom. Thus we find a continuum of correlation weights developed spatially along the delay line. The optical dimension transverse to the direction of acoustic propagation can be used to provide another array dimension.
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