Frequency hopping spread spectrum passive acoustic wave identification device
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United States of America Patent
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Apr 4, 2006
Issued Date -
N/A
app pub date -
Oct 14, 2003
filing date -
Aug 18, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system and method for interrogating a passive acoustic transponder, producing a transponder signal having characteristic set of signal perturbations in response to an interrogation signal, comprising a signal generator, producing an interrogation signal having a plurality of differing frequencies; a receiver, for receiving the transponder signal; a mixer, for mixing the transponder signal with a signal corresponding to the interrogation signal, to produce a mixed output; an integrator, integrating the mixed output to define an integrated phase-amplitude response of the received transponder signal; and an analyzer, receiving a plurality of integrated phase-amplitude responses corresponding to the plurality of differing frequencies, for determining the characteristic set of signal perturbations of the passive acoustic transponder.
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