We consider the problem of spatial localization of a set of sound sources using flexible microphone antenna arrays. At the beginning, the problem of determining the coordinates of microphones through the use of calibration sources is solved. For this, we use optimization of the objective function, which is the norm of the difference between the measured and estimated delays in the arrival of calibration signals from sources to microphones, by unknown coordinates of the calibration sources and microphones. The results of simulation and experiment are presented, which show an acceptable efficiency of the proposed calibration technique. For acoustic imaging, MUSIC and the maximum likelihood signal classification method (MLSIC) were employed. The first method is widely known and was previously used to estimate the direction of arrival of plane waves. The second method was recently proposed and is based on the interference model, which includes M sources of a coherent field. The results of localization of acoustic sources were obtained using numerical simulation, as well as by an experiment in an anechoic chamber. It was shown that the MLSIC method has a better spatial resolution than the MUSIC method.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 64, No. 7, pp. 522–534, July 2021. Russian DOI: https://doi.org/10.52452/00213462_2021_64_07_522
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Ivanenkov, A.S., Rodionov, A.A. & Savel’yev, N. Superdirective Acoustic Imaging with the Use of Flexible Microphone Arrays. Radiophys Quantum El 64, 471–481 (2021). https://doi.org/10.1007/s11141-022-10148-5
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DOI: https://doi.org/10.1007/s11141-022-10148-5