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Method and apparatus for improving the accuracy of a vehicle location system

  • US 3,886,554 A
  • Filed: 04/23/1973
  • Issued: 05/27/1975
  • Est. Priority Date: 04/23/1973
  • Status: Expired due to Term
First Claim
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1. The method of locating the position of a vehicle comprising the steps of:

  • radiating a radio signal from the vehicle in a predetermined radiation pattern;

    switching the directivity of said radiation pattern to a predetermined sequence of radiation patterns;

    receiving said radio signal in said sequence of radiation patterns at two geographically spaced receiving sites;

    comparing the signals received at said two sites to determine the location of said vehicle.

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