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Distance measuring method and apparatus therefor

  • US 5,329,467 A
  • Filed: 03/27/1991
  • Issued: 07/12/1994
  • Est. Priority Date: 03/30/1990
  • Status: Expired due to Fees
First Claim
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1. A distance measuring method comprising the steps of:

  • generating first and second pseudo random signals which are equal to each other in wave pattern but different from each other in frequency;

    generating a first time-series pattern obtained by multiplying said first and second pseudo random signals by each other;

    radiating laser light toward a target after intensity-modulating laser light with said first pseudo random signal;

    converting a change in intensity of reflected light into an electric signal after reception of said reflected light as a reception signal from said target;

    generating a second time-series pattern by multiplying said electric signal by said second pseudo random signal; and

    measuring a distance to said target by calculating a time difference between said first and second time-series patterns.

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