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FMCW distance measurement process

  • US 6,040,898 A
  • Filed: 12/22/1997
  • Issued: 03/21/2000
  • Est. Priority Date: 06/20/1995
  • Status: Expired due to Term
First Claim
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1. A FMCW distance measurement method, comprising:

  • modulating a wave train of carrier frequency f0 by a time function f(t) and splitting said wave train into a transmission signal and a reference signal in a deterministic phase relationship;

    putting the transmission signal onto a transmission link to be measured and feeding the reference signal to a phase difference-forming arrangement;

    feeding a signal reflected in the transmission link and delayed by the propagation time τ

    as a reception signal to the phase difference-forming arrangement;

    wherein the phase difference-forming arrangement forms the time difference function θ

    (t) of the phases between the reference and reception signals;

    evaluating the phase difference function θ

    (t) separately with respect to a direct component θ

    = =g'"'"'(τ

    , f0) assigned to the carrier frequency f0 and with respect to an alternating component θ

    - (t)=g"(τ

    , f- (t)) assigned to the modulation time function f(t); and

    determining the propagation time τ

    proportional to the distance by a combined evaluation of said direct component and said alternating component of the phase difference function.

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