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

  • US 7,110,442 B2
  • Filed: 04/05/2005
  • Issued: 09/19/2006
  • Est. Priority Date: 02/24/2000
  • Status: Expired due to Term
First Claim
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1. An enhanced digital channel processor for as satellite positioning system (SATPS) receiver, comprising:

  • Means for receiving a down-converted SATPS in successive data bit periods and integrating said signal in an integration period longer than said data bit periods; and

    A memory processor having a storage device comprising two storage parts, wherein, during a low SNR and/or fast acquisition mode, said memory processor accumulates sums representative of samples of said down-converted SATPS signal in said integration period, stores the accumulated sums in one of said storage parts, and plays back at a substantially accelerated rate the sums stored in the other of said storage parts.

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