I wonder how accurately you can determine the location of individuals across a house? I remember WiSee (http://wisee.cs.washington.edu/ http://wisee.cs.washing

I wonder how accurately you can determine the location of individuals across a house? I remember WiSee (http://wisee.cs.washington.edu/ http://wisee.cs.washington.edu/) a while back and ever since then I thought it would make for a fantastic home security system. You plot out your perimeter and when armed it goes off whenever a person crosses the threshold. With some of the improvements from this system, it could even be possible to have it always armed but excluded certain people from tripping the alarm. I wish I had the knowledge and experience to implement such a system (radio-wise).