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Transponder system and method for measurement of separation

  • US 20050012653A1
  • Filed: 11/05/2002
  • Published: 01/20/2005
  • Est. Priority Date: 11/09/2001
  • Status: Active Grant
First Claim
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1. Method for determining the distance (dist) between a base station (BS) and at least one transponder (TR) which comprises radiating out by the base station (BS) a signal (stx(t)) from a base station oscillator (OSZB);

  • using an oscillating oscillator (OSZT) of the transponder (TR) to generate a signal (sOSZ(t)) which is phase-coherent with and based on the signal (erxt(t)) received from the base station (BS), and radiates out this signal, determining the distance (dist) is the base station (BS) by reference to the phase-coherent signal (srx(t)) received from the transponder (TR), wherein the oscillator (OSZT) for generating the phase-coherent signal (sOSZ(t)) is excited quasi-phase-coherently with the received signal (srxt(t)).

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