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Method and apparatus for fast acquisition and low SNR tracking in satellite positioning system receivers

  • US 6,888,879 B1
  • Filed: 02/24/2000
  • Issued: 05/03/2005
  • Est. Priority Date: 02/24/2000
  • Status: Expired due to Term
First Claim
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1. An enhanced digital channel processor for a satellite positioning system (SATPS) receiver, comprising:

  • a memory processor having a storage device, wherein, during a low SNR and/or fast acquisition mode, said memory processor accumulates samples of a down-converted SATPS signal that have sequential ordinal positions that are repeated within each of a plurality of pseudo-random noise (PRN) code repetition periods in an integration period, stores in said storage device a separate accumulated sum for each ordinal position of each code repetition period, and plays the sums back at a substantially accelerated rate.

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