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Location determination using RF fingerprinting

  • US 6,782,265 B2
  • Filed: 04/22/2002
  • Issued: 08/24/2004
  • Est. Priority Date: 09/22/1998
  • Status: Expired due to Term
First Claim
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1. A method for locating a position of a mobile unit in a wireless communication network, said method comprising:

  • receiving a first RF fingerprint from said mobile unit, wherein said first RF fingerprint is indicative of a portion of the RF spectrum at said mobile unit at a first time;

    generating a first probability distribution for said position of said mobile unit based on said first fingerprint;

    generating a second probability distribution for said position of said mobile unit based on said first probability distribution and on at least one possible motion of said mobile unit between said first time and a second time, wherein said second time is after said first time;

    receiving a second RF fingerprint from said mobile unit, wherein said second RF fingerprint is indicative of said portion of the RF spectrum at said mobile unit at said second time; and

    generating a third probability distribution for said position of said mobile unit based on said second probability distribution and on said second fingerprint.

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