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Frequency hopping spread spectrum passive acoustic wave identification device

  • US 6,633,226 B1
  • Filed: 02/10/1999
  • Issued: 10/14/2003
  • Est. Priority Date: 08/18/1997
  • Status: Expired due to Fees
First Claim
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1. A system for interrogating a passive acoustic transponder, producing a transponder signal having characteristic set of signal perturbations in response to an interrogation signal, comprising:

  • (a) a signal generator, producing an interrogation signal having a plurality of differing frequencies;

    (b) a receiver, for receiving the transponder signal;

    (c) a mixer, for mixing said transponder signal with a signal corresponding to said interrogation signal, to produce a mixed output;

    (d) an integrator, integrating said mixed output to define an integrated phase-amplitude response of the received transponder signal for each of said differing frequencies; and

    (e) an analyzer, receiving a plurality of integrated phase-amplitude responses corresponding to said plurality of differing frequencies, for determining the characteristic set of signal perturbations of the passive acoustic transponder.

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