Patent ID: 7541968

Claim:
A method of relating a position of an object to a perimeter of a zone, the method comprising the steps of: a. generating three or more first waveforms, each of the three or more first waveforms indicating a multipath structure of a propagation channel of first UWB signals having been transmitted from a first UWB radio to a corresponding one of three or more second UWB radios; b. defining the perimeter of the zone based upon a person traversing a perimeter of the zone; c. generating three or more second waveforms, each of the three or more second waveforms indicating a multipath structure of a propagation channel of second UWB signals having been transmitted from the first UWB radio to the corresponding one of the three or more second UWB radios; d. comparing each one of the three or more first waveforms to the corresponding one of the three or more second waveforms to determine the position of the object; and e. relating the position of the object to the perimeter of the zone.