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Rangefinder and method for collecting calibration data

  • US 20050110977A1
  • Filed: 03/04/2004
  • Published: 05/26/2005
  • Est. Priority Date: 11/26/2003
  • Status: Active Grant
First Claim
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1. A method for calibrating a rangefinder having a transmitter for emitting a beam towards a target and a receiver for detecting a reflected beam, wherein an uncalibrated flight time of the beam and the reflected beam is measured by a counter, the method comprising:

  • determining a first relationship between flight times and target ranges, wherein the first relationship has a corresponding first slope;

    generating a first simulated range measurement by measuring a first discharge time of a capacitor;

    generating a second simulated range measurement by measuring a second discharge time of the capacitor;

    calculating a second relationship between flight times and target ranges based on the first and second simulated range measurements, wherein the second relationship has a corresponding second slope;

    using the second relationship to correlate an uncalibrated range measurement to the first relationship; and

    determining a distance to a target.

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