Importance

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Abstract

A system for continuously establishing and indicating the location of a movable object comprises a first transmitter secured to the object for periodically transmitting, at a first predetermined frequency, first radio frequency signals representative of an identification code uniquely associated with the object. A plurality of receiver/repeater stations are positioned at spaced locations within a predetermined geographic area, each receiver/repeater station including a plurality of spaced receivers for receiving and demodulating the first radio frequency signals to provide an object identification code signal and a device associated with each first receiver for determining the strength of the received first radio frequency signal and for generating a strength signal for each receiver. Signal processor circuitry and a computer are centrally located within the predetermined geographic area in communication with the first receiver and the strength determining device for receiving the signals representative of the object identification code and the strength signals, for calculating the location of the object based upon the strength signals and for storing signals representative of the object identification code and the location of the object. A master tracking station is in communication with the signal processing circuitry and computer for each of a plurality of predetermined geographic areas. The master tracking station receives and stores the signals representative of the object identification code and the object location and provides a visual indication of the object identification code and object location.

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First Claim