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Evaluation concept for distance measuring processes

  • US 6,259,515 B1
  • Filed: 02/05/1999
  • Issued: 07/10/2001
  • Est. Priority Date: 02/07/1998
  • Status: Expired due to Term
First Claim
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1. A process for determining the distance between a distance sensor and an object, wherein an electrical pulse signal with a predetermined first frequency (f1) is directed to one transmitter of the distance sensor, the transmitter transmits upon the occurrence of each electrical pulse a wave pulse, the wave pulses are reflected off the object, a receiver of the distance sensor receives the reflected wave pulses and puts out an analog electrical incoming signal, characterized by the steps of:

  • continuously scanning the analog electrical incoming signal by an A\D converter at a second frequency (f2) with f2>

    f1, converting the scanned electrical incoming signal into a digital signal Z(t), and evaluating the digital signal Z(t), for the purpose of determining a distance value (D), by;

    a) evaluating the digital signal Z(t), received with respect to one or several emitted wave pulses, for determining a first wave pulse propagation time (T1);

    b) k-fold repeating step a) for determining total k wave pulse propagation times (T1, T2, . . . , Tk), wherein k is an integral number with k>

    1;

    c) calculating a mean wave pulse propagations time T (T1+T2+ . . . +Tk)/k;

    d) calculating the distance value (D) in accordance with D=v*T/2, wherein v is the propagation speed of the wave pulses;

    continuously entering the obtained distance values (D) in a memory; and

    differentiating several distance values (D) with respect to time to continuously determine the relative speed between the object and the distance sensor.

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