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Method and apparatus for locating a wireless user

  • US 8,155,017 B2
  • Filed: 05/19/2008
  • Issued: 04/10/2012
  • Est. Priority Date: 09/06/1994
  • Status: Expired due to Fees
First Claim
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1. A method for use in a subscriber unit, the method comprising:

  • receiving, at the subscriber unit, at a first time of arrival, a first signal from a first antenna;

    receiving, at the subscriber unit, at a second time of arrival, a second signal from a second antenna;

    determining, at the subscriber unit, a difference between the first time of arrival of the first signal from the first antenna and the second time of arrival of the second signal from the second antenna; and

    transmitting, by the subscriber unit, to the first antenna or the second antenna, a third signal carrying information indicating the determined difference between the first time of arrival of the first signal from the first antenna and the second time of arrival of the second signal from the second antenna, wherein the third signal is spread coded.

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