Patent ID: 6567038
Filing Date: 2003-05-20
Classification: A63B,G01S

Abstract:
A tracking system for tracking players or objects on a sports field, said system comprisinga first and a second microwave antenna, one said antenna comprising a microwave transmitter and a receiver and the other said antenna comprising only a receiver, one or more transponders respectively carried by one or more of the players or objects on said field, each said receiver comprising electronic processing circuitry connected to receive signals from said transponders received at both said first and second antennas to calculate the position of and to identify each of the players or objects on said field, and each of the transponders comprising means for receiving a microwave signal at a defined frequency from said one antenna, means for shifting the frequency of said received microwave signal by a frequency unique to said transponder relative to other ones of said transponders in said tracking system, and means for transmitting said shifted frequency signal for reception by said first or said second antenna.