METHOD FOR ANALYZING COMPOSITE SIGNALS IN AN AUTOCORRELATION RECEIVER Russian patent published in 2020 - IPC G01S7/40 

FIELD: radio equipment.

SUBSTANCE: invention relates to methods and equipment for radio monitoring of radio-frequency sources. Technical result is achieved by the fact that the received signal is filtered, delayed for a given time, multiplies the signal with its delayed copy, estimates the differential signal frequency, selecting signal component at difference frequency and low-frequency component of signal, obtaining their amplitude-frequency spectra (AFS), frequency of received signal after filtration is doubled, double frequency signal is delayed for a predetermined time, multiplied with a delayed copy, differential signal frequency is evaluated, a signal component is determined on the difference frequency and a low-frequency signal component, obtaining their AFS, obtained signal spectra are compared with given threshold values and based on the comparison results, a decision is made on the type of the received radar signal, according to the invention, additionally: if it was decided to receive a chirp signal, then a low-frequency envelope of the signal component at the difference frequency is determined, from which the pulse duration and repetition period is determined, determining the rate of change of frequency inside the chirp pulse and the width of the spectrum of the chirp pulses; if it was decided to receive a simple signal, then duration and pulse repetition period is determined by low-frequency component; if it has been decided to receive a phase-coded signal, then the signal at double frequency is fed for phase automatic frequency tuning, generating a reference signal and multiplying it with the received signal after filtering, method includes selecting a low-frequency component from which the law of phase alternation, number of discrepancies, duration and repetition period of pulses are determined, duration of one code discrete and width of the spectrum of the phase-coded signal are determined. In the proposed method of analyzing complex signals in an autocorrelation receiver, the novel essential features of the invention are newly introduced procedures for processing radar signals after determining their type.

EFFECT: technical result, achievement of which is the claimed invention, is expressed in improvement of accuracy of determination of parameters of chirp pulse, phase-coded signal and simple radio pulses, having carrier frequencies in the band of the high-frequency input filter of the receiver, when receiving the chirp, the phase-coded signal, or simple radio pulses, as well as with simultaneous reception of the chirp and simple radio pulses.

1 cl, 1 dwg