METHOD OF DETERMINING THE TYPES OF RADAR SIGNALS IN AN AUTOCORRELATION RECEIVER Russian patent published in 2020 - IPC G01S13/32 

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, in the first channel: delayed for a given time, multiplies the signal with its delayed copy, evaluating the first channel signal differential frequency, extracting the signal component at the difference frequency of the first channel and the low-frequency signal component, obtaining their amplitude-frequency spectra (AFS); in second channel: frequency of received signal after filtration is doubled, signal at double frequency is delayed for a given time, multiplied with delayed copy, difference frequency of the second channel signal is estimated, signal component at difference frequency of the second channel and low-frequency component of the signal is selected to receive AFS. 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 a CPM signal, then the signal component at the differential frequency of the first channel is delayed for phase-locked loop (PLL), feeding it for PLL, forming a simple signal and subtracting it from the signal component after the delay for the adjustment time, determining a low-frequency envelope of the component of the obtained signal difference and normalizing it, determining a low-frequency envelope of the signal component at the differential frequency of the first signal, from which reference CPM signals are generated based on all possible Barker codes, which correspond to the obtained normalized signals, subtract the reference CPM signals from the corresponding normalized signals. If a decision is made to receive LFM and CPM signals, a low-frequency envelope of the signal component at the differential frequency of the first signal is determined and normalized, on which CPM reference signals are generated on all possible Barker codes, which correspond to the obtained standardized signals, subtract the reference CPM signals from the corresponding normalized signals. Absence of a signal after subtracting the reference CPM signal is used to determine a signal with Barker code phase-code manipulation. Signal with phase-code manipulation by Frank code is determined by signal presence after subtraction of reference CPM signal.

EFFECT: technical result is expansion of types of radar signals monitored during radio monitoring.

1 cl, 1 dwg, 1 tbl