Interrogator for detecting adjacent transponders

Details Interrogator for detecting adjacent transponders Interrogator for detecting adjacent transponders

1995-06-07

1996-08-27

Sotomayor, John B.

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

Radar transponder system

342 44, G01S 1375

Patent

active

055505481

ABSTRACT:
A method for interrogating remote transponders having the steps of: sending an RF interrogation pulse from an interrogator (10), receiving by a first and second transponder (12,12a) the RF interrogation pulse, and establishing in a resonant circuit (130) of each of the transponders (12,12a) an oscillation, the oscillation being established by the coupling of signal energy from the RF interrogation pulse into the resonant circuit (130). After the RF interrogation pulse ends, the first transponder (12) senses the termination of the pulse and initiates a first RF response having a selected duration. A second RF response from the second transponder (12a) will also be detected in the first transponder (12) whose response will be affected by this second RF response. The differing response times in the first transponder (12) for responses affected and unaffected by neighboring transponders may be sensed in the interrogator so the interrogator may detect instances in which the RF responses which it received may have been conflicting.

REFERENCES:
patent: 3872476 (1975-03-01), Shames et al.
patent: 4761651 (1988-08-01), Matsunaga
patent: 5053774 (1991-10-01), Schuermann et al.
patent: 5126744 (1992-06-01), Goedeke et al.
patent: 5150114 (1992-09-01), Johansson
patent: 5294931 (1994-03-01), Meier

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