FIELD: radio engineering, communication.
SUBSTANCE: invention relates to radio engineering and particularly to radio direction-finding. The disclosed method includes receiving a multibeam signal using a multielement antenna system, synchronous conversion of the group of received signals, which are dependent on time and the number of the element of the antenna system, into digital signals, converting the digital signals into an amplitude-phase distribution (APD) signal y, which describes the amplitude u and phase φ distribution of signals in elements of the antenna system; determining a two-dimensional signal A of an M×N complex phasing function, which is dependent on the given reception frequency and describes possible directions of arrival of the signal from each potential source, where M is the number of elements of the antenna system, N is the number of angular directions which correspond to given potentially possible directions of the signal on the azimuth θk and elevation angle βk, where k=1, 2,…, N. A multi-signal angular spectrum and a vector of signal amplitudes u, which represents amplitude distribution on bearings θk and βk, are obtained by generating point estimates of the amplitude u and bearings of signals using a composite function with a given step of updating the descent direction using a conjugate gradient method, which includes the sum of signal differences A, multiplied by the amplitude of the desired APD signal y, and the product of yi and the logarithm of the signal A, multiplied by the amplitude of the desired APD signal y, divided by εi 2yi, where εi is relative error of the value yi, the minimum point of which determines point estimates of parameters Θ, which enables to determine the amplitude u for each bearing in a given range of angles. The obtained multi-signal angular spectrum is used to construct a bearing panorama, from which the number, intensity and bearings of the radio-frequency sources are determined.
EFFECT: obtaining an angular spectrum of multiple radio-frequency sources, shorter time for calculating bearings and high accuracy of direction-finding.
2 cl, 1 dwg
