Hi, I need to make a 3d linear motion detection system for, oh... say a ball. I was thinking of setting up 3 small base stations that would ping something inside the ball and would be wired to a microcontroller that would use a triangulation algorithm to figure out the displacement of the ball along the 3 axes. I know that this isn't a new problem and that the devices to do this should exist. - Does anyone out there know what devices I should be looking for to construct this thing? - Does anyone know if there is already an existing triangulation algorithm for such a task? - Any other comments / suggestions? I'll take any help I can get. I have incredibly stringent deadlines. Thanks ahead of time for the help.