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NAVIGATIONAL SYSTEM

  • US 3,721,985 A
  • Filed: 06/22/1970
  • Issued: 03/20/1973
  • Est. Priority Date: 06/22/1970
  • Status: Expired due to Term
First Claim
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1. A method of navigating a dirigible craft at an altitude above ground level to a destination at ground level, comprising the steps:

  • receiving signals at said destination from a predetermined number of sending stations at ground level having known locations, and simultaneously emitting a slave signal from said destination upon receipt of at least one such signal;

    receiving said station signals at said dirigible craft;

    receiving said slave signal at said craft;

    using the received signals to determine the position of said destination with respect to at least one of saiD stations;

    using the received signals to determine the coordinate position of said craft with respect to at least one of said stations; and

    determining the slant range of said craft from said destination, based on the relative coordinate positions of said craft and said destination and based on the times at which certain of said signals are received at said craft.

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