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System and method for location-finding using communication signals

  • US 6,876,325 B1
  • Filed: 04/01/2004
  • Issued: 04/05/2005
  • Est. Priority Date: 04/01/2004
  • Status: Expired due to Fees
First Claim
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1. A receiver for receiving code division multiple access (CDMA) signals and determining the location of the receiver at least in part from the CDMA signals, comprising:

  • an antenna for receiving transmitted CDMA signals;

    a circuit for converting the frequency of the CDMA signals and digitizing the CDMA signals into in-phase and quadrature signals;

    a variable length pseudorandom code generator to generate a pseudorandom code;

    an early, late and true correlator to correlate the in-phase and quadrature signals with the pseudorandom code; and

    a processor to compute the location of the receiver.

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