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ONE WAY OPTICAL RANGING SYSTEM

  • US 3,576,371 A
  • Filed: 02/05/1969
  • Issued: 04/27/1971
  • Est. Priority Date: 02/05/1969
  • Status: Expired due to Term
First Claim
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1. A method for determining distance comprising the steps of:

  • transmitting radiation signals of known intensities through the atmosphere at two different frequencies, one of said frequencies being substantially unaffected by atmosphere;

    receiving the signals and separating the signals into first and second received signals, determining range by detecting the attenuation of the first received signal, and utilizing the second received signal from the atmospherically unaffected signal to provide a correction factor for said first signal.

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