发明名称 |
Electronic identification system |
摘要 |
<p>An identification system comprises an interrogator and a number of transponders. The interrogator includes a transmitter (10) for transmitting an interrogation signal to the transponder, and a receiver (16,18,20,22) for receiving a response signal from the transponder. A micro-processor (28) identifies the transponder from data in the response signal. Each transponder comprises a receiving antenna (30) for receiving the interrogation signal, a code generator (36), a transmitting antenna (32), and a modulator (40) 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 (42) responsive to a respective interruption in the interrogation signal to cease transmission of its own response signal.</p> |
申请公布号 |
EP1262926(A1) |
申请公布日期 |
2002.12.04 |
申请号 |
EP20020017523 |
申请日期 |
1992.01.03 |
申请人 |
BTG INTERNATIONAL LIMITED |
发明人 |
MARSH, MICHAEL JOHN CAMILLE;LENARCIK, ANDRZEJ |
分类号 |
G01S13/74;G01S13/75;G06K7/00;G06K17/00;G07B15/06;G07C9/00;G08B13/14;G08B21/02;G08G1/017;H04L1/08;(IPC1-7):G07C9/00 |
主分类号 |
G01S13/74 |
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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