Archives of Acoustics, 39, 1, pp. 37-50, 2014

Digital Signal Processing Approach in Air Coupled Ultrasound Time Domain Beamforming

Krzysztof HERMAN
Faculty of Electronics, Wroclaw University of Technology

Tadeusz GUDRA
Faculty of Electronics, Wroclaw University of Technology

Faculty of Behavioural Ecology, University of Wroclaw

The work presents the results of experimental study on the possibilities of determining the source of an ultrasonic signal in two-dimensional space (distance, horizontal angle). During the research the team used a self-constructed linear array of MEMS microphones. Knowledge in the field of sonar systems was utilized to analyse and design a location system based on a microphone array. Using the above mentioned transducers and broadband ultrasound sources allows a quantitative comparison of estimation of the location of an ultrasonic wave source with the use of broadband modulated signals (modelled on bats’ echolocation signals) to be performed. During the laboratory research the team used various signal
processing algorithms, which made it possible to select an optimal processing strategy, where the sending signal is known.
Keywords: beamforming, air-coupled ultrasounds, DSP, bat signals, direction of arrival.
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DOI: 10.2478/aoa-2014-0005