Acoustic Self-Positioning based on Interpolation of Received Amplitude Map for 2DoF Angular Bessel Beam Scanning

A self-positioning method based on monoaural recording of a single microphone located in spatiotemporally structured ultrasound field is proposed. Such positioning techniques with a single sensor is suitable for broadening the applications of mobile devices with a built-in microphone. This research proposes a positioning method based on the previous works, where angular scanning of a pair of steerable ultrasonic Bessel Beams is employed for trigonometric positioning. The proposed method spatially interpolates the received signal samples to find its peak giving the directional clue of the microphone with a finer resolution. As a result of numerical simulations, a shortened procedure duration and improved positioning accuracy were verified, which will contribute to practical application of the proposed method.