METHOD OF DETERMINING PARAMETERS OF FREQUENCY-CODED SIGNALS IN AN AUTOCORRELATION RECEIVER Russian patent published in 2020 - IPC G01S7/41 G01S13/26 G01S13/28 

FIELD: radio equipment.

SUBSTANCE: invention relates to radio engineering, particularly to methods and equipment for radio monitoring of radio-frequency sources. Received signal is filtered, delayed for a given time, the signal with its delayed copy is multiplied, the difference frequency of the signal is assessed, the signal component at the difference frequency and the low-frequency component of the signal are picked up and their amplitude-frequency spectra (AFS) are obtained. Obtained signal spectra are compared with given threshold values and the results of comparison are used to decide on the type of the received radar signal. If a decision is made to receive frequency-coded signals (FCS), the received signal after filtration is stored, a low-frequency envelope of the component is determined after filtering the received signal, from which the pulse duration is determined. Main lobe of AFS is separated with low-frequency component of signal, from which duration of one discrete signal code is determined, number of discrete N and width of signal spectrum is determined, memorized signal is delayed for different time equal to duration of one to (N-1) discrete code sample. Received stored signal is multiplied with a delayed copy and spectrograms are generated, from which the differential matrix is formed and a code sequence of signal frequency jumps is determined.

EFFECT: technical result is enabling determination of FCS availability and parameters in autocorrelation receiver.

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