METHOD FOR DETERMINING THE RANGE TO A MOVING RADIATION SOURCE USING PASSIVE SONAR Russian patent published in 2023 - IPC G01S3/80 

FIELD: hydroacoustics.

SUBSTANCE: invention can be used in passive sonar systems in the near zone of radiation of a source with a circular wave front with on-board spaced and extended antennas, towed and stationary, as well as in atmospheric acoustics and passive radar systems. Essence: in the method for determining the coordinates of a moving radiation source by a passive sonar containing the reception of signals with a circular wave front by a receiving system (RS) of M antennas (M≥3) located in space in a known way, preliminary and inter-antenna spatio-temporal processing, including sampling, fast Fourier transform (FFT), space survey on the indicator with coordinate direction scales α and range D, displaying the location of radiation sources in the field of observation in the form of their signal marks (SM) and means for accurately determining coordinates and auto-tracking using discrimination - measuring the sign and magnitude of deviations of current measurements from the direction δ_α and range δ_D to the "reference" point (RP) with coordinates α_op and D_op, in the presence of an interfering source (IS), two channels for determining coordinates and automatically tracking sources are used, one of which is the IS channel, pointing at the location of the interfering radiation source by phasing the antennas, the second - the observation channel is directed to the intended or observed - "reference" point (RP S) of the location of the desired "useful" signal of the radiation source S, that is of interest for the observer, with the expected coordinates α_Sop(t), D_Sop(t), in the IS channel, the power density spectra (PDS) of the IS signal P_mki are measured, as well as the mutual power density spectra (MPDS) of signals from the outputs of the IS and S channels: G_mki. C signals from the outputs of the RS antennas entering the observation channel S are "cleaned" from the signal components of the interfering source by their weighted subtraction from signals y_mki(α_S, D_S) with weight equal to the ratio , the discrimination values of direction deviations and range are obtained, and the current coordinates of the radiation source S are determined by adjusting the coordinates of the reference point: .

EFFECT: improving the accuracy of determining the coordinates of the radiation source by a passive sonar in the near zone of the field of a low-noise moving radiation source, by reducing the impact of a strong interfering source on processing the signal of interest for the observer.

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