Patent ID: 6396413
Filing Date: 2002-05-28
Classification: G07C

Abstract:
Apparatus for monitoring the location of a person within a monitored premises having a plurality of designated areas interconnected by gateways, comprising:a plurality of radio frequency transmitters located throughout said monitored premises, at least one of said transmitters being located in each designated area, each of said transmitters broadcasting a signal comprising a unique code identifying the transmitter; and a portable receiver carried by the person capable of receiving the signals broadcast by each of the transmitters, said portable receiver having means for determining the code of a broadcast received, processing said code to determine its validity as representing a position within the monitored premises in close proximity to the person, and storing a validated code as a record of the location of the person at the time of the reception thereof, said processing means comprising means for comparing the code received to a list of previously received and stored codes corresponding to a record of previous other locations for the person and determining whether the received code corresponds to a valid location for the person based upon a logical relationship between the position associated with the received code and the record of previous other locations.