Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1993-11-18
1996-05-21
Peng, John K.
Communications: electrical
Condition responsive indicating system
Specific condition
340568, 34082554, 342 44, G08B 2100, H04B 700
Patent
active
055193811
ABSTRACT:
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 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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Lenarcik Andrzej
Marsh Michael J. C.
Oosthuizen Marthinus J. R.
Van Schalkwyk Andries C.
Van Zyl Clinton A.
British Technology Group Limited
Peng John K.
Wu Daniel J.
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