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System and method for despreading in a spread spectrum matched filter

  • US 20050025222A1
  • Filed: 06/16/2004
  • Published: 02/03/2005
  • Est. Priority Date: 09/01/1998
  • Status: Active Grant
First Claim
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1. A method for measuring time related to satellite data messages for use with a satellite positioning system (SPS), the method comprising:

  • receiving in a mobile SPS receiver at least a portion of a satellite data message;

    determining a first record of the at least a portion of the satellite data message by despreading a PN code from the satellite data message, wherein the satellite data message comprises a plurality of signal samples, each signal sample having an in-phase portion and a quadrature-phase portion, and wherein the PN code comprises a plurality of chips, the despreading step comprising;

    selecting one of the in-phase portion and the quadrature-phase portion; and

    multiplying the selected portion of one of the plurality of signal samples with one of the plurality of PN code chips; and

    transmitting from the mobile SPS receiver the first record to a remote basestation for the purpose of determining a time indicating when the first record was received at the mobile SPS receiver.

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