Patent ID: 7397366

Claim:
A method of finding a person who has been buried alive by means of a wireless receiver with a directional characteristic, which employs a search phase when received signal strength, such received signal strength corresponding to a current target distance d between the receiver and a transmitter carried by the buried person, is less than the signal strength corresponding to a predefined threshold distance d 1 , and which employs a point-location phase when the received signal strength for the current target distance d is greater than the signal strength corresponding to the predefined threshold distance d 1 , the method comprising the steps of: reception, by the wireless receiver, of signals transmitted from a wireless transmitter belonging to the buried person, processing of the received signals to determine the current target distance d, comparing the processed signal for the determined current target distance d to the signal corresponding to the predefined threshold distance d 1 and when the signals indicate, d>d 1 , employing a search phase including display of information related to the location of the buried person, d<d 1 , employing a point-localization phase, wherein the point-localization phase includes repeatedly carrying out the following steps: storing the current target distance d and displaying a representation of the current target distance d as well as a symbolic comparison of the current target distance d to at least one target distance that was previously received and stored.