G - Physics – 01 – S
Patent
G - Physics
01
S
G01S 13/74 (2006.01) G01S 13/75 (2006.01) G06K 7/00 (2006.01) G06K 17/00 (2006.01) G07B 15/00 (2006.01) G07C 9/00 (2006.01) G08B 13/14 (2006.01) G08B 21/02 (2006.01) G08G 1/017 (2006.01) H04L 1/08 (2006.01)
Patent
CA 2058692
An identification system suitable for identifying and communicating with members of a group. The identification system comprises an interrogator and a number of transponders. The interrogator includes a transmitter for transmitting an interrogation signal to the transponder, and a receiver for receiving a response signal from the transponder. A micro-processor identifies the transponder from data in the response signal. Each transponder comprises a receiving antenna for receiving the interrogation signal, a code generator, a transmitting antenna, and a modulator connected to the code generator. On receipt of the interrogation signal the transponder repeatedly transmits a response signal containing data which identifies the transponder. The interrogator detects successful identification of any transponder and briefly interrupts the interrogation signal to indicate the successful identification. Each transponder includes a logic circuit responsive to a respective interruption in the interrogation signal to cease transmission of its own response signal. The identification system is suitable for applications such as identifying and counting objects in a warehouse, or groceries in a supermarket, or vehicles or personnel in demarcated areas.
Lenarcik Andrzej
Marsh Michael John Camille
Btg International Limited
Ridout & Maybee Llp
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