FIELD: hydroacoustics.
SUBSTANCE: method for determining the range to a moving radiation source using a passive sonar contains M spaced sonar antennas (M≥3), preliminary processing, including discretization, digital transformation and Fourier transform (FT), means of review in a given sector of observation and range interval, identification of the coordinates of the detected signal mark on the view indicator αn, Dn, and to determine and track the current direction to a moving radiation source αs*(t) each m-th antenna is phased in the direction from its center to the OT, at each i-th DFT cycle, the complex paired mutual power density spectra (PMPDS) of the signals of the antenna pairs of the receiving system are measured and the direction deviation discriminator is used. To determine the current range value on each i-th cycle of the DFT, the discriminator of the deviation of its reference range value Drefi from the desired true DSi is used, while applying a nonlinear range scale to the virtual focus points of the receiving system Rfi with coordinates <αrefi, rf>, for which the lower limit of the range interval Dfn is predetermined on the linear scale D, in which the radiation source is supposed to move in the process of observation and tracking: D≥D fn, and on each next i-th cycle of the DFT the reference virtual focusing point of the receiving system Rfi with coordinates <αrefi, rrefi> is designated in it so that the direction to Rfi coincides withαrefi, and the range rrefi is related to Drefi by a rigid non-linear relationship: rrefi = Drefi-1 * γf, where γf is the scale factor, and the magnitude and sign of the deviation δRi of the current reference value rrefi is determined based on the desired range value to the virtual source, and the current estimate of the actual range on the i-th DFT cycle is determined as Drefi* = Drefi -δRi and subjected to dynamic averaging by known methods for determining the parameters of successive measurements and predicting their values for subsequent measurement cycles.
EFFECT: improving the accuracy of determining the range, especially at large values of D/B, where B is the base size of the PS.
2 cl, 5 dwg
