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The noise immunity of the method for estimating the depth of a stationary sound source in an oceanic waveguide, based on the information about the amplitude ratio of selected wave field modes, is considered. It is shown that the error in recovering the source depth is always limited and tends to a stationary value with an increase in the noise level. The results of a computational experiment with a single detector and a horizontal linear antenna for the low-frequency region are reported. The behavior of the depth estimate in dependence of the mode numbers and detector depth is analyzed for the limiting case of intense noise. The stability of the method with respect to variations in the speed-of-sound profile is demonstrated.
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Besedina et al. (2015) studied this question.
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