Power-efficient technique for multiple tag discrimination

Details Power-efficient technique for multiple tag discrimination Power-efficient technique for multiple tag discrimination

1995-04-21

1996-05-28

Sotomayor, John B.

Communications: directive radio wave systems and devices (e.g.,

Radar transponder system

Unique identity

342 51, G01S 1376

Patent

active

055216013

ABSTRACT:
This invention provides a tag identification system and method for identifying tags in the range of a reader station where the tags are divided into smaller groups, where the tags are identified one group at a time so as to save power by powering off the tags that are not in the group currently being identified. Each tag puts itself in a group by performing calculations from parameters stored in itself and from parameters received from the reader station. In another variation of this invention, only tags which configure themselves to be activated at a final frequency are identified. The set of tags which configure themselves to be activated at the final frequency changes with each identification round until all tags in the range of the reader have been identified.

REFERENCES:
patent: 4885571 (1989-12-01), Pauley et al.
patent: 5231273 (1993-07-01), Caswell et al.
patent: 5406275 (1995-04-01), Hassett et al.
patent: 5448242 (1995-09-01), Sharpe et al.
patent: 5450087 (1995-09-01), Hurta et al.
patent: 5471212 (1995-11-01), Sharpe et al.

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