Object identification system

Details Object identification system Object identification system

G - Physics

01

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343/19

G01S 13/74 (2006.01) B61L 25/04 (2006.01) G01S 13/00 (2006.01) G01S 13/75 (2006.01) G06K 7/08 (2006.01) G06K 19/067 (2006.01) G07C 9/00 (2006.01) G08G 1/017 (2006.01)

Patent

CA 1112340

Abstract of the Disclosure A transmitting/receiving antenna means radiates a sweep frequency signal as an interrogation signal toward an answer device. The answer device includes a plurality of resonators which are connected in parallel and have different resonance frequencies and answer antenna means connected in parallel with these resonators and transmits a resonance answer signal including ringing answer signals corresponding to the resonators, in response to the interrogation signal. A phase adjusting means is provided which receives at the input the sweep frequency signal and the resonance answer signal and phase-adjusts these signals to have the phase difference therebetween 0 or 180°. The output of the phase adjusting means is applied to a detector where the ringing answer signals are detected to form binary answer signals corresponding to the ringing answer signals, respectively. An object with the answer device fixed thereat is identified from these binary answer signals. The phase adjusting means effectively removes the noise signal included in the resonance answer signal, resulting in effective detection of the ringing answer signal.

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