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Process and system for measuring the distance of a moving body from a fixed part

  • US 6,614,239 B2
  • Filed: 01/18/2002
  • Issued: 09/02/2003
  • Est. Priority Date: 01/19/2001
  • Status: Expired due to Fees
First Claim
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1. A process for measuring the distance of a moving body (12) from a fixed part (10), characterized in that it comprises the steps of:

  • generating a first alternating signal (r(t)) having a frequency within the radio-wave range or the elastic-wave range;

    emitting the first signal from the fixed part towards the moving body (12);

    receiving the first signal (r(t)) on the moving body (12) and generating, on the moving body (12), a second signal (s(t)) having a frequency (nf) equal to the frequency of the first signal (r(t)) multiplied by a constant factor (n), the second signal (s(t)) having an initial phase (φ

    1) equal to the phase (2π

    ft1

    0) at the instant (t1 ) in which it is received by the moving body (12);

    generating, on the fixed part, a third signal (u(t)) having a frequency (nf) equal to the frequency of the second signal (s(t)) and an initial phase (φ

    0) equal to the initial phase of the first signal (r(t)); and

    determining the variation in distance of the moving body (12) in a pre-set time interval as a function of the variation in the amplitude of an alternating signal obtained from the sum of the second signal (s(t)) and the third signal (u(t)) in the same time interval.

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