Air Ultrasonic Signal Localization with a Beamforming Microphone Array

Figure 3

Simulated reconstruction result with sum and delay beamforming for a ring array with 32 elements (Figure 2(a)) at a distance of 18 cm from two point sources which are separated by 5 mm. (a) The sources are two spherical waves at 75 kHz. (c) The sources are spherical waves at 74 and 76 kHz, respectively. (b), (d) Cross section of (a) and (c) at y = 0. Red dots show the position of the sources.

(a)

(b)

(c)

(d)