Acoustic Source Localization in Wireless Sensor Network

Abstract

In this paper, we consider the problem of acoustic source localization in a wireless sensor network based on different measured signal quantities, such as the received signal strength (RSS), the angle of arrival (AOA) and the time of arrival (TOA). For each of these quantities, an appropriate weighted least squares criterion function is developed to be used for sound source localization. The weights of each criterion function take into account the decrease in the signal-to-noise ratio (SNR) with distance from the source. In addition, RSS localization algorithm proposed in this paper provides improvement of the localization accuracy for low SNR. Finally, separate criterion functions for RSS, TOA and AOA are used together to obtain minimal localization error and maximal reliability of the acoustic source localization. Simulation analysis confirms improved performance of the proposed localization algorithm.Keywords Angle of arrival · Received signal strength · Sensor network · Time delay of arrival · Time of arrival Z.M. Saric ( ) RT-SP Computer Based Systems, Novi Sad, Serbia

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“…Acoustic source localization using WSNs has a number of possible applications, including intruder detection, sniper localization [16]. Wang et al [17] and Saric et al [18] present an overview of such wireless localization systems with detailed analyses and characterisations of typical source localization algorithms in WSNs. In [19], a PZT-based wireless system for composite impact monitoring is proposed to give a localized search area for further inspection.…”

“…It differs from work in the aforementioned studies in the sense that it utilises aliased versions of AE signals instead of the original signals in the localization process. Therefore, the results presented in [17][18][19] would not be appropriate for a fair comparison. In contrast to the work presented in [20], the calculations of localization features such as arrival time and peak amplitude are locally extracted by the individual acoustic wireless units.…”

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