METHOD OF PASSIVE DETERMINATION OF COORDINATES OF MOVING WEAK RADIATION SOURCE Russian patent published in 2020 - IPC G01S3/80 

FIELD: physics.

SUBSTANCE: method for passive determination of coordinates of a moving weak radiation source relates to hydroacoustics and can be used in passive sonar in a radiation area of a source with a circular (spherical, cylindrical) wave front, as well as in atmospheric acoustics and passive radar. For passive determination of coordinates of a radiation source, wide-aperture receiving systems are used from M ≥ 3 spatially spaced apart antennas arranged in space in a known manner. Proposed method comprises receiving radiation source signals by M antennas, M ≥ 3 arranged in space in a known manner, preliminary processing in reception channels, possibility of observing signal marks of radiation sources in a given sector of angles and range of distances, including guidance to point of supposed location of weak source - reference point (RT) and cyclic measurement of coordinates, including correction of coordinates of RT on subsequent cycles of measurements, and phasing of all antennae in directions from their centres to current coordinates of RT α_fromj, D_fromj. To determine the current position count measured value deviations δ_αj, δ_Dj coordinates away from the desired current coordinates of the source α_s(t_j), D_s(t_j), δ_αδα for which the measure for each i^th cycle PD pairwise power spectra density (PPSD) and obtaining on each frequency ƒ_k of the elements table of the PPSD the output signals of all antenna pairs, averaging the elements thereof and applying a matrix inversion transformation thereto, obtaining new tables of inverted measurements, and deviation values δ_αj, δ_Dj are determined using summation at each frequency of elements of said tables, first by index mn (m, n = 1, … , M) with compensation of differences of propagation times of signal to centers of m^th and n^th antennas τ_mni and weight coefficients for direction and range taking into account the geometry of the system <PS-source>, then summing up by the index k (by frequency), correcting α_op, D_opj by value δ_αj, δ_Dj respectively, and current estimates of coordinates of radiation source , at moment t _j and prediction of reference values α_op(j+1), D_op(j+1) to next (j+1)^th step are determined by results of dynamic smoothing sequences of coordinates estimates.

EFFECT: task of the proposed method is passive determination of coordinates of a moving weak source in a mixed anisotropic field of interference, which contains a scattered background component, as well as coherent components caused by other interfering sources of radiation.

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