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System and method for dual-mode location determination

  • US 8,255,149 B2
  • Filed: 01/28/2005
  • Issued: 08/28/2012
  • Est. Priority Date: 07/12/1999
  • Status: Expired due to Term
First Claim
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1. A location determination method in a mobile terminal, comprisinga. taking a plurality of observation measurements from a respective plurality of GPS signals received by the mobile terminal;

  • b. if the mobile terminal is in view of a communication satellite, then transmitting said plurality of observation measurements to said communication satellite for delivery to a service operations center for determination of a location of the mobile terminal; and

    c. if the mobile terminal is in view of a cellular mobile telephone network, then transmitting said plurality of observation measurements, along with location area information received from said cellular mobile telephone network, to a cellular tower in said cellular mobile telephone network for delivery to a service operations center for determination of a location of the mobile terminal.

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