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Mobile radiotelephone determination using time of arrival of GPS and pilot signals

  • US 6,249,253 B1
  • Filed: 04/13/1999
  • Issued: 06/19/2001
  • Est. Priority Date: 04/13/1999
  • Status: Active Grant
First Claim
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1. A method for determining a location of a radiotelephone comprising a pilot signal receiver, a global positioning system (GPS) signal receiver, and a local clock, the radiotelephone operating in a radiotelephone system comprising a plurality of bases stations, each base station comprising a pilot signal transmitter and a GPS signal receiver, the method comprising the steps of:

  • estimating a time of arrival of GPS signals at the radiotelephone GPS receiver relative to the radiotelephone clock;

    estimating a time of arrival of a radiotelephone system pilot signal at the radiotelephone signal receiver relative to the radiotelephone clock; and

    calibrating the time of arrival values in response to delays associated with the base station'"'"'s pilot signal transmitter and the radiotelephone'"'"'s pilot signal receiver.

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