Apparatus and method for identifying multiple transponders

Details Apparatus and method for identifying multiple transponders Apparatus and method for identifying multiple transponders

1994-07-27

1996-02-06

Sotomayor, John B.

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

Radar transponder system

342 44, 34082554, G01S 1375

Patent

active

054899087

ABSTRACT:
Apparatus and method for identifying a plurality of transponders (10-16) located within an inquiry field (18) of an interrogation unit (20) are provided. Each transponder (10-16) is assigned an unique identification code, and the interrogation unit (20) dynamically constructs and modifies a bit string used to solicit responses from selected transponder(s) until each transponder (10-16) in the inquiry field (18) is identified. The bit string is transmitted to the transponders, which compares it with the least significant bits of their respective identification codes. A mismatch between the identification code and the bit string results in suppressing the response from the transponder.

REFERENCES:
patent: 4333072 (1982-06-01), Beigel
patent: 5041826 (1991-08-01), Milheiser
patent: 5053774 (1991-10-01), Schuermann et al.
patent: 5430447 (1995-07-01), Meier
patent: 5438335 (1995-08-01), Schuermann et al.

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