I'm working on a project where the bot will be confined to a set walled area. I'm using shaft encoders to track where the bot is roaming about the play area (roughly 15 ft by 10 ft). In regards to errors that will ultimately compound as well as things like someone picking it up and moving it, where he is at power up, etc I also want to triangulate the location to sort of reset where the bot is. I was intrigued by a method in the Robot Builder's Bonanza using sonar coupled with IR light to triangulate a position (using 3 beacons). There wasn't a whole lot of info in the book about it and I was wondering if someone has attempted this or if there is some more info out there about it (parts, circuits, notes, etc)?
What might be some other methods to figure a dead spot position? I haven't explored GPS much, is this a viable option (using a Basic Stamp 2) and considering it's a relatively small bot on a 9 volt?
thanks