Digital Signal Processing Approach in Air Coupled Ultrasound Time Domain Beamforming

Abstract

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.

Archives of Acoustics

“…This type of sonar appeared to be very effective and made it possible to implement the system BatSLAM which was able to solve the simultaneous localization and mapping problem (SLAM) (Steckel, Peremans, 2015). MEMS microphones were also used in (Herman et al, 2014) to create a linear array. The DOA was determined by implementing of beamforming algorithms.…”

Azimuth Angle Determination for the Arrival Direction for an Ultrasonic Echo Signal

“…MEMS technology made it possible to create small size microphones. In [5], a linear array of MEMS microphones is presented. It was used for the implementation of beamforming algorithms and correlation function-based methods.…”