This may sound a stupid question - but I am working on some simple microphone array beamforming sound source localization stuff. I think I understand how to use beamforming to find the TOA of the sound source between 2 microphones (positioned, say on the x axis), and therefore how to find the angle, phi. If the source is positioned normal to the z axis then this makes theta (the azimuth) equal to pi/2. However how do I find the r coordinate of the source vector? As I understand it , I cant localize the source without this coordinate.
Any help much appreciated, thanks in advance