METHOD OF DETECTION OF WIDEBAND PHASE-MANIPULATED SIGNALS AND OF DETERMINATION OF SHAPE OF MODULATION AT ACOUSTIC-OPTIC PROCESSING OF SIGNALS Russian patent published in 2007 - IPC G01R23/16 

FIELD: analysis of received signals in multi-channel and single-channel communication systems.

SUBSTANCE: according to the method light flux is formed due to partial reflection of light flux, which illuminates the first medium of acoustic-optic interaction. Second medium of acoustic-optic interaction is illuminated by the formed light flux. Third medium of acoustic-optic interaction is illuminated due to full reflection. Coming entrance electric signal is subject to multi-channel band filtration to analyze and detect signals at n different frequencies. Signals are twice subject to conversion at any frequency: to square amplification, to multiplication with reference voltage and to band filtration at the same frequency. Two analyzed signals after first and second conversion correspondingly are subject to conversion into ultrasonic waves into second and third media of acoustic-optic interaction correspondingly. Second and third coherent optic light fluxes, diffracting onto second and third media, are subject to spatial Fourier transforms. Then conversed light fluxes are registered on base of photo-electric effects in points of space, which correspond to frequencies in second and third analyzed groups; then they are conversed into electric voltages. Voltages are stored for analysis and carrier frequency of received signal is found from extracted photo-electric effect. Type of modulation of signal is found from combination of photo-electric effect.

EFFECT: ability of simultaneous detection of sinusoidal signals and of phase-modulated wide band signals, determination of their carrier frequencies and type of their phase modulation.

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