METHOD OF PASSIVE DETERMINATION OF COORDINATE OF SOURCES OF SONAR RADIATION Russian patent published in 2019 - IPC G01S3/80 

FIELD: hydro acoustics.

SUBSTANCE: invention relates to the field of hydroacoustics and can be used in passive sonar, as well as in atmospheric acoustics and passive radar. Method for the passive determination of the coordinates of hydroacoustic radiation sources is proposed, which contains the reception of the signals M≥3 with antennas, pre-processing of the received signals, including synchronous sampling, digital transformation and Fourier transformation (FT), indication in the coordinate grid (CG) "direction-range", calculation for each pq-th cell of CG of pairwise differences of propagation times of the signal. In accordance with the proposed method, fans of directed channels (DC) are formed on each of the M antennas and for each direction α_nki at each frequency ƒ_k of FT arrays define a triangular table from (M²-M)/2 values of the pairwise SPS estimation of the output signals X_mik=[x_mik] of each m-th antenna with the output signals of each n-th antenna with a temporary accumulation of estimates of the SPS. Obtained triangular table is transformed into the matrix G_i(ƒ_k) = [g_mni(ƒ_k)] of dimension M×M and the transformation of the inversion is applied. After that, the elements of the inverse matrix [b_mni(ƒ_k)] are summed by m, n in [p, q]-th CG nodes with multiplication by the time delay compensation factor exp(-jƒ_kτ_mni(α_p, D_q)), are summed by frequency ƒ_k within the frequency range of reception ƒ_kn, ƒ_kv with a given frequency response h(ƒ_k) and are indicated in the coordinate grid "direction-range" (α_p/D_q), and the coordinates of the radiation sources are determined from the position of the maximums of the indicator values on the coordinate scales of the CG.

EFFECT: proposed method allows to reduce the distortion and increase the accuracy of determining the coordinates and resolution in the direction and range of several radiation sources in a given observation sector (α_min, α_max) on the indicator screen, as well as reduce the distortion of their signal marks on the indicator.

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