Patent ID: 8170581
Filing Date: 2012-05-01
Classification: G08B

Abstract:
1. A system for tracking a location of a person having a mobile signal transmitter, the system tracking the location of the person having the signal transmitter in conjunction with the mobile signal transmitter for transmitting an Identification (ID) signal that is uniquely determined for respective mobile signal transmitter, the system comprising: at least one receiver configured to receive the unique ID signal transmitted by the signal transmitter, wherein the at least one receiver receives the unique ID signal near circumference of the person having the signal transmitter spaced apart from the receiver by a given distance, and stores the received unique ID signal in an ID store unit, and wherein the at least one receiver, when a search request for a specific ID is received from an external server, searches for the requested ID in the ID store unit and transmits transmission information including an ID corresponding to the requested ID to the external server, wherein the signal transmitter continually transmits the unique ID signal at least one given period, and wherein the signal transmitter comprises: a transmission signal generation unit configured to generate the unique ID signal; a short-distance signal transmission unit configured to transmits the unique ID signal generated by the transmission signal generation unit for a predetermined time, the unique ID signal transmitted by the a short-distance signal transmission unit having a power which allows the unique ID signal to be transmitted up to a first distance relatively close to the short-distance signal transmission unit; a long-distance signal transmission unit configured to transmit the unique ID signal generated by the transmission signal generation unit for a predetermined time, the unique ID signal transmitted by the a long-distance signal transmission unit having a power which allows the unique ID signal to be transmitted up to a second distance relatively longer than the first distance; and a time counter configured to calculate the at least one given period or a point of time at which the short-distance signal transmission unit and the long-distance signal transmission unit transmit the unique ID signal.