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Title: System and method for simultaneously collecting serial number information from numerous identity tags

Abstract

A system and method are disclosed 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, themore » final possibility will be successful because a clear time-slot channel will be available. 5 figs.« less

Inventors:
Issue Date:
Research Org.:
University of California
OSTI Identifier:
415749
Patent Number(s):
5,591,951
Application Number:
PAN: 8-542,214
Assignee:
Univ. of California, Oakland, CA (United States)
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 7 Jan 1997
Country of Publication:
United States
Language:
English
Subject:
05 NUCLEAR FUELS; IDENTIFICATION SYSTEMS; INFORMATION RETRIEVAL; RADIOWAVE RADIATION; SEMICONDUCTOR STORAGE DEVICES; DATA TRANSMISSION; SECURITY

Citation Formats

Doty, M A. System and method for simultaneously collecting serial number information from numerous identity tags. United States: N. p., 1997. Web.
Doty, M A. System and method for simultaneously collecting serial number information from numerous identity tags. United States.
Doty, M A. Tue . "System and method for simultaneously collecting serial number information from numerous identity tags". United States.
@article{osti_415749,
title = {System and method for simultaneously collecting serial number information from numerous identity tags},
author = {Doty, M A},
abstractNote = {A system and method are disclosed 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. 5 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {1}
}