Proximity reading of coded tag

Details Proximity reading of coded tag Proximity reading of coded tag

G - Physics

01

V

343/19, 340/124.

G01V 3/08 (2006.01) G06K 7/00 (2006.01)

Patent

CA 2001445

In a proximity-reading coded-tag system, a coded tag responds to a high-frequency interrogation signal by providing a binary signal of a predetermined low frequency and bearing a code that is unique to said tag; and by transmitting a high-frequency response signal of a given high frequency, with the response signal being modulated with the uniquely coded low-frequency binary signal; and a coded-tag reader receives and demodulates the high-frequency response signal to detect the uniquely coded low-frequency binary signal. The modulator of the coded tag modulates the response signal by shifting the center frequency of the response signal during each pulse of the low-frequency uniquely coded binary signal to thereby vary the amplitude at the given high frequency in the responsesignal in accordance with said unique binary code and at the rate of the predetermined low frequency; and the demodulator of the coded-tag reader is tuned to the predetermined low frequency of the coded binary signal for detecting the unique binary signal code in accordance with amplitude or phase variations at the given high frequency in the received high-frequency response signal caused by the frequency shifting.

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