3d Tracking

[zorm]

I should also add that if you do want to try something like echo location from timing, you'd be much much better off with a single fixed transmitter instead of like 4 or something. Atleast to start with anyways, this would greatly reduce the complexity of your system!

[Chavo]

Is the system going to be embedded everywhere? If not, how will it communicate, and with what?

The project's goal, as far as I understand, is not to be a portable solution.  The goal is to locate an object of interest in a room.  Like I said before, he isn't trying to reinvent GPS.

[Camel]

My suggestion is to forget trying to do echo location, you're going to need fancy hardware and stuff for that apparently.

Speakers and microphones for a project like this need not be terribly fancy - fidelity is completely irrelevant for the speaker (you can harvest the speakers of old computers/cars from a grave/junkyard), and sufficient microphones are not expensive.

Radio- and echo-location are two totally distinct approaches, so it's tough to say which would be easier. It certainly does seem that more people have attempted radio-location recently, though.