Direction Finding of a Source in an Acoustic Waveguide
and the Angular Resolution Limit
A. G. Sazontova, b, * and and I. P. Smirnova, b
a Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod, 603155 Russia
b Nizhny Novgorod State University, Nizhny Novgorod, 603105 Russia
Correspondence to: * e-mail: sazontov@ipfran.ru
Received 20 September, 2020
Abstract—A reduced-rank adaptive algorithm is constructed, which makes it possible to find sound sources directions using a horizontal array operating in a waveguide with inaccurately known parameters. Statistical simulation results are presented, demonstrating the high resolution of the method and acceptable accuracy in bearing estimation without the prior knowledge of the source ranges and depths. The Smith criterion is used to find the theoretical limit of the angular resolution as a function of the input signal-to-noise ratio and size of the input sampling.
Keywords: acoustic waveguide with inaccurately known parameters, estimation of directions to signal sources, adaptive NM-RARE algorithm, angular resolution limit, statistical simulation
DOI: 10.1134/S1063771021020068