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Dead reckoning system for reducing auto-correlation or cross-correlation in weak signals

  • US 6,529,829 B2
  • Filed: 07/20/2001
  • Issued: 03/04/2003
  • Est. Priority Date: 08/24/2000
  • Status: Expired due to Term
First Claim
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1. A dead reckoning system, comprising:

  • a Global Positioning System (GPS) receiver, comprising;

    a first data path for correlating an incoming GPS signal, located within a scanned signal window, with a locally generated signal; and

    a second data path for verifying the incoming GPS signal, located within the scanned signal window, against a lock signal, the second data path determining whether the incoming GPS signal has at least one characteristic which differentiates the incoming GPS signal from an auto-correlated signal;

    wherein the GPS receiver can change the locally generated signal to continue to search the scanned signal window for a second incoming GPS signal if the incoming GPS signal lacks the at least one characteristic; and

    at least one sensor, coupled to the GPS receiver, for selectively providing a dead reckoning input to the GPS receiver in the dead reckoning system for use in computing a position of the GPS receiver.

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