METHOD FOR SHAPING AND PROCESSING COMPOSITE SIGNAL IN NOISE-IMMUNE RADIO SYSTEMS Russian patent published in 2003 - IPC

FIELD: radio engineering; structural hiding of signals in noise-immune systems. SUBSTANCE: on sending end carrier wave is phase-keyed by pseudorandom sequence and by data signal; on receiving end pseudorandom sequence is picked off, this being followed by its demodulation in Kostas circuit; novelty is that modified band noise is used as carrier wave, its time sections with amplitude higher than threshold value being uniformly distributed in phase within ±π/2 relative to reference frequency-modulated oscillation phase; sections with amplitude lower than threshold value are uniformly distributed in phase within ±π, composite signal is processed with aid of Kostas circuit involving follow-up of introduced carrier frequency modulation. EFFECT: enhanced reliability of composite phase-keyed signal structural hiding. 1 cl, 9 dwg