METHOD OF DETECTING FREQUENCY-SHIFT KEYED RADIO SIGNALS Russian patent published in 2013 - IPC G01S13/52 

FIELD: radio engineering, communication.

SUBSTANCE: method of detecting frequency-shift keyed radio signals involves performing analogue-to-digital conversion of the input signal, calculating the amplitude spectrum for sampling a signal of given length, estimating the position and width of the spectrum of the radio signal, filtering the ratio signal on the spectrum into two equal parts, calculating envelopes of the filtered components, calculating the cross correlation coefficient for the obtained envelopes, making a decision on associating the received signal with a class of frequency-shift keyed signals based on comparison of the calculated cross correlation coefficient with a predetermined threshold.

EFFECT: wider class of detected frequency-shift keyed radio signals, high probability of correct detection of frequency-shift keyed radio signals with 4 or more frequency components, shorter detection time.

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