METHOD FOR SPECTRAL-CORRELATION DETECTION OF AIRCRAFT BY QUASI-CONTINUOUS PULSE SIGNALS OF ON-BOARD AVIONIC SYSTEMS Russian patent published in 2022 - IPC G01S13/04 G01S7/41 

FIELD: radar technology.

SUBSTANCE: invention relates to the field of passive radar and can be used in radio intelligence (RI) to detect aircraft by quasi-continuous pulse signals of avionics. In the claimed method, sequentially performed operations of broadband spectral Fourier analysis of the input implementation in the frequency band and time window of spectral analysis are carried out, determined by the a priori uncertainty of the operating carrier frequency of quasi-continuous radio emissions of avionics and the setting of the energy storage time of the input implementation, squaring the generated amplitude-frequency spectrum of the input implementation and threshold processing of decisive statistics from the detector output. After squaring the amplitude-frequency spectrum of the input implementation, its inverse spectral Fourier transform is performed with the calculation of the autocorrelation function (ACF) of the input implementation, blanking of the central maximum of the ACF and, consistent with the number of hypotheses being tested regarding the a priori unknown pulse repetition frequency of the received signal, multi-channel strobing of its ACF by a sparse sample of complex samples of the generated ACF in the range consistent with the duration of the received signal. The gated ACF samples are further subjected to incoherent summation by squaring the modular values of the gated ACF samples and summing them, followed by threshold processing of the summation results.

EFFECT: reduction in the number of processing channels of the detector of signals from avionics of pulse-Doppler type, which provides the required level of false alarm probability and an acceptable deterioration in the detection characteristics relative to the coordinated correlation-filter method for receiving the signals in question.

1 cl, 11 dwg