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Method and apparatus for geolocating a wireless communications device

  • US 20030176196A1
  • Filed: 11/12/2002
  • Published: 09/18/2003
  • Est. Priority Date: 03/18/2002
  • Status: Active Grant
First Claim
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1. For a transmitting unit transmitting a signal, a method for determining the time difference of arrival of the signal received at two or more receiving sites, said method comprising:

  • (a) for the signal received at the two or more receiving sites, determining a frequency domain representation of the signal, wherein the frequency domain representation comprises a two dimensional number for each of a plurality of frequencies; and

    (b) determining the time difference of arrival using the two-dimensional numbers for like-frequency component pairs from at least two frequency domain representations.

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