System and method for simultaneously collecting serial number in

Details System and method for simultaneously collecting serial number in System and method for simultaneously collecting serial number in

1995-10-12

1997-01-07

Hajec, Donald T.

Registers

Coded record sensors

235375, 34082534, G06K 700

Patent

active

055919510

ABSTRACT:
A system and method for simultaneously collecting serial number information reports from numerous colliding coded-radio-frequency identity tags. Each tag has a unique multi-digit serial number that is stored in non-volatile RAM. A reader transmits an ASCII coded "D" character on a carrier of about 900 MHz and a power illumination field having a frequency of about 1.6 Ghz. A one MHz tone is modulated on the 1.6 Ghz carrier as a timing clock for a microprocessor in each of the identity tags. Over a thousand such tags may be in the vicinity and each is powered-up and clocked by the 1.6 Ghz power illumination field. Each identity tag looks for the "D" interrogator modulated on the 900 MHz carrier, and each uses a digit of its serial number to time a response. Clear responses received by the reader are repeated for verification. If no verification or a wrong number is received by any identity tag, it uses a second digital together with the first to time out a more extended period for response. Ultimately, the entire serial number will be used in the worst case collision environments; and since the serial numbers are defined as being unique, the final possibility will be successful because a clear time-slot channel will be available.

REFERENCES:
patent: 4800543 (1989-01-01), Lyndon-James et al.
patent: 5030807 (1991-07-01), Landt et al.
patent: 5430441 (1995-07-01), Bickley et al.
patent: 5444223 (1995-08-01), Blama
patent: 5478991 (1995-12-01), Watanabe et al.
patent: 5541583 (1996-07-01), Mandelbaum
patent: 5541585 (1996-07-01), Duhame et al.

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