Patent ID: 8045498

Claim:
A system for monitoring the location of a mobile network unit, the system comprising a localised wireless communication network having a control unit, a plurality of fixed network units and at least one mobile network unit: the control unit further comprising a processor having an accessible memory; the mobile network unit further comprising a transmitter for transmitting an identification signal unique to that mobile network unit; the fixed network units each having a transceiver to receive the identification signal directly from a mobile network unit within a predetermined radius of the fixed network unit and indirectly from another fixed network unit, and to transmit the identification signal and a signal strength data to the control unit through the wireless communication network; the fixed network units each having a sensor to measure the strength of the identification signal received directly from the mobile network unit and output the measured strength as the signal strength data; the control unit processor having means to process the identification signal and the signal strength data received from a pair of the fixed network units that received the identification signal directly from the mobile network unit and determine the location of the mobile network unit.