METHOD OF IDENTIFYING RADIO SIGNALS Russian patent published in 2012 - IPC G06K9/00 H04H60/56 

FIELD: physics.

SUBSTANCE: to obtain parameters of reference radio signals and identifying features of the received radio signal, an exponential function is calculated from a spectrogram. Elements of each matrix are then quantised on two levels, after which matrices consisting of quantised elements are processed via two-dimensional discrete cosine transform and a new set of matrices is obtained. Further, from each matrix, using a "zigzag scanning" procedure, elements in which 99% of the signal energy is concentrated are selected, and the obtained values are used as reference parameters or identification features. The obtained features are compared with reference parameters and a decision is made on associating the received radio signal with one of the reference classes.

EFFECT: high reliability of identifying signals with a complex structure in noise and interference conditions owing to use of exponential functions from a spectrogram when calculating signal energy distribution matrices and reducing dimensions thereof based on two-dimensional discrete cosine transform.

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