Current "all digital" channelized approaches to intercept of spread spectrum/frequency hopping communications signals cannot effectively address the problems posted by "full band: ( 200 mhz) medium-fast (> or - 500 hps) frequency hopping waveforms. Hybrid ds/fh communications waveforms pose even more stringent perforMance requirements, unsatisfiable by current or near-term digital technology. Use of act technology as a digitally programMable transversal channelizer, optimized alternatively for either "spread" (hybrid) or "unspread) frequency hopping waveforms can provide the essential front end frequency partitioning function for a high perforMance spread spectrum/lpi communications intercept system. Arranging two such channelizers as an interfereometer will allow exploitation of the one attribute which lpi emitters (generally) cannot control; namely, spatially coherent emissions. Effecting the interferometric (aoa) measurettent(s) via a correlation type of phase detector insures coherent integration perforMance; 35 to 40 db snr enhancement can be expected for (hybrid) hop rates of 500 to 1,000 hps.
