Detection of multiple articles

Details Detection of multiple articles Detection of multiple articles

G - Physics

01

S

G01S 13/78 (2006.01) A47F 9/04 (2006.01) G01S 13/24 (2006.01) G01S 13/75 (2006.01) G06K 7/00 (2006.01) G06K 7/08 (2006.01) G06K 7/10 (2006.01) G06K 17/00 (2006.01) G07C 9/00 (2006.01) G07G 1/00 (2006.01) G07G 3/00 (2006.01) G08B 13/24 (2006.01) H01Q 1/22 (2006.01) H01Q 21/06 (2006.01) G01S 13/87 (2006.01)

Patent

CA 2103288

An identification system comprises an interrogator and a plurality of transponders. The interrogator includes a transmitter which transmits at least two independent interrogation signals to the transponders, and a receiver for receiving response signals from the transponders. The interrogator also includes processor means for identifying the transponders from data in the received response signals. Each transponder comprises receiving means, a code generator, and transmitter means connected to the code generator. On receipt off at least one of the transmitted interrogation signals the transponder transmits a response signal containing data which identifies it. The interrogation signals may be transmitted continuously or intermittently. In a preferred embodiment, the interrogation signals are relatively narrow bandwidth signals at different frequencies. The receiving means of each transponder has a relatively broad reception bandwidth so that the transponder is responsive to one or more of the interrogation signals.

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