METHOD FOR AUTOMATIC DETECTION OF NARROW-BAND SIGNALS Russian patent published in 2013 - IPC H04B1/10 

FIELD: radio engineering, communication.

SUBSTANCE: method for automatic detection of narrow-band signals involves receiving an analogue signal z(t), digitising said signal, for which discretisation, quantisation and coding operations are performed successively; the digitised signal z_i is pre-divided into N equal fragments, over which Fourier transform {F1_j, F2_j, …, FN_j} is independently performed; parameters S_j of the spectral representation are calculated via successive multiplication of spectral representations {Fl_j, F2_j, …, FN_j}, which correspond to N fragments of the digitised signal z_i, and then compared with a threshold value, and based on the comparison results, a decision on signal detection is made, wherein the threshold value R is calculated by calculating the tripled value of the average value of parameters of the spectral representation S_j, and the decision on signal detection is made based on the results of comparing the threshold value R with the calculated parameters S_j of the spectrum representation F_j, for which the condition R<S_j is satisfied.

EFFECT: high reliability of making a decision on the presence of a useful signal in a received realisation.

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