Single microphone positioning based on Angular scanning of acoustic Bessel beam from symmetric ultrasound emission

Abstract

We propose a three-dimensional self-positioning method of the single microphone situated in the acoustic field containing the steered Bessel beams generated by a two-dimensional planar ultrasound phased array. The presented method is a modified version of the previously proposed one that suffered from considerable positioning errors. In this paper, we report that this error is caused from asymmetric emission of the phased array that results in distorted beam shape. To overcome this problem, we divided the array aperture in two sub-apertures that separately formed two scanning beams. As a result, the estimation error is tremendously reduced. We also demonstrate that this error can be even reduced to several millimeters by performing coarse-to-fine two stage estimation as a post processing.

Keywords

• Acoustic positioning
• Acoustic phased array
• Acoustic bessel beam
• Single receiver positioning