发明名称 |
Detection of multiple articles |
摘要 |
<p>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 of at least one of the transmitted interrogation signals the transponder transmits a response signal containing data which identifies it. The interrogation signals are transmitted continuously. 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.</p> |
申请公布号 |
EP0789253(A2) |
申请公布日期 |
1997.08.13 |
申请号 |
EP19970104997 |
申请日期 |
1993.11.18 |
申请人 |
BRITISH TECHNOLOGY GROUP LIMITED |
发明人 |
MARSH, MICHAEL JOHN CAMILLE;LENARCIK, ANDRZEJ;VAN ZYL, CLINTON AIDEN;VAN SCHALKWYK, ANDRIES CHRISTOFFEL;OOSTHUIZEN, MARTHINUS JACOBUS RUDOLPH |
分类号 |
G07G1/14;A47F9/04;G01S13/24;G01S13/74;G01S13/75;G01S13/78;G01S13/87;G06K7/00;G06K7/08;G06K7/10;G06K17/00;G06Q50/00;G07C9/00;G07G1/00;G07G3/00;G08B13/24;H01Q1/22;H01Q21/06;H04B1/59;(IPC1-7):G01S13/02 |
主分类号 |
G07G1/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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