METHOD OF DETECTING AND EVALUATING CHARACTERISTICS OF WIDEBAND SIGNALS AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2024 - IPC G01S3/14 

FIELD: radio engineering.

SUBSTANCE: group of inventions relates to radio engineering and can be used to detect and measure basic characteristics of wideband signals (WBS). In the disclosed method, simultaneous synchronous conversion of signals S(t) received by the N-channel radio receiver to an intermediate frequency with subsequent conversion to digital form is performed, obtaining, using Fourier transform, spectral characteristics of the signal for each of the N receiving channels in the simultaneous scanning band with a sampling step f₀, accumulation for each frequency component and each N-th reception channel of M continuous time samples of the signal, which are divided into K sections K=M/L, and on each interval K signal samples of each frequency position for signals of all N reception channels calculating a cross-correlation function (CCF) with signals of the n-th reference channel, n=1, 2, …, N, which is assigned based on the maximum value of the average signal amplitude on the interval of K samples. Based on a set of values direction is determined {θ, β} to the signal source at the i-th frequency at the j-th moment of time by calculating the normalized CCF d(θ_r, β_m) between measured and reference values for all possible azimuth and elevation directions with subsequent search of normalized CCF d(θ_r, β_m) with a maximum value, the argument of which corresponds to the most probable direction of arrival of the signal. Determining continuous in the range of frequencies and time sections on which the measured parameters {θ, β} with allowance for given measurement error are constant. Decision on WBS detection is made, measured parameters {θ, β} are clarified by averaging the width of the spectrum of the detected WBS and its average frequency are determined. Disclosed device is an N-channel direction finder based on a phase interferometer, supplemented with units for detecting and evaluating WBS characteristics.

EFFECT: implementation of functions of detection and estimation of characteristics of a priori unknown WBS and improvement of accuracy of measurement of its spatial parameters: bearing θ and elevation angle β.

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