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Position determination by directional broadcast

  • US 20070222679A1
  • Filed: 03/24/2006
  • Published: 09/27/2007
  • Est. Priority Date: 03/24/2006
  • Status: Active Grant
First Claim
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1. A method to determine the position of an object is comprising:

  • providing a system comprising a system comprising a multitude of broadcast stations, communicating among each other and one or more objects whose positions are to be determined, wherein each of these objects has a transponder, an identifying code, and a means to measure phase shifts of signals;

    using the identifying code of an object whose position is to be determined as input in a nearest broadcast station;

    broadcasting from multiple broadcast stations an omni-directional reference signal and directional signals having each a phase shift characterizing their direction;

    calculating the directions of said object relative to at least two of said broadcast stations using the phase difference between the reference signal and one of said directional signals measured at the object'"'"'s site;

    calculating the position of said object using the directions calculated in previous step; and

    displaying position of said object.

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