Electronic quasi-passive identification system
First Claim
1. A quasi-passive identification system comprising:
- an interrogator having a signal generator means for generating radio-frequency energy, an interrogation encoder means for encoding said radio-frequency energy with an interrogation code to produce an interrogation signal, an interrogation transmit means for radiating said interrogation signal, and a response receive means for receiving radio-frequency signals; and
a transponder having an interrogation receive means for receiving radio-frequency signals and separating said radio-frequency signals into received radio-frequency energy and a coded signal, an interrogation decoder means for decoding said coded signal, and a response transmit means controlled by said interrogation decoder means for encoding said received radio-frequency energy with a response code to produce said response signal and for radiating said response signal.
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Abstract
A quasi-passive identification system having an interrogator and a passiveransponder. The interrogator has a signal generator that generates radio-frequency energy under the control of a manual actuator. A preset encoder encodes the radio-frequency energy with an interrogation code to produce an interrogation signal that is radiated by an antenna. The transponder has an receiver for receiving the interrogation signal and separating it into received radio-frequency energy and a coded signal. A decoder decodes the coded signal and looks for a match between the coded signal and the interrogation code. A response transmitter, which is controlled by the decoder, encodes the received radio-frequency energy with the response code and radiates the response signal. When a receiver in the interrogator receives the response signal, the response signal is decoded and analyzed for a proper response. A response indicator is energized when a proper response is received.
13 Citations
17 Claims
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1. A quasi-passive identification system comprising:
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an interrogator having a signal generator means for generating radio-frequency energy, an interrogation encoder means for encoding said radio-frequency energy with an interrogation code to produce an interrogation signal, an interrogation transmit means for radiating said interrogation signal, and a response receive means for receiving radio-frequency signals; and a transponder having an interrogation receive means for receiving radio-frequency signals and separating said radio-frequency signals into received radio-frequency energy and a coded signal, an interrogation decoder means for decoding said coded signal, and a response transmit means controlled by said interrogation decoder means for encoding said received radio-frequency energy with a response code to produce said response signal and for radiating said response signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A passive transponder, for use in responding to a radio-frequency input signal modulated with a proper interrogation code, comprising:
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a receive means for receiving radio-frequency input signals and separating said input signals into radio-frequency energy and a coded signal; a decoder means connected to said receive means for decoding said coded signal and producing an output if said coded signal matches said interrogation code; and a transmit means responsive to said output of said decoder means for encoding said radio-frequency energy with a response code and for radiating said energy as a response signal. - View Dependent Claims (14, 15, 16, 17)
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Specification