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Deeply-integrated adaptive GPS-based navigator with extended-range code tracking

  • US 6,731,237 B2
  • Filed: 12/03/2001
  • Issued: 05/04/2004
  • Est. Priority Date: 11/09/1999
  • Status: Expired due to Term
First Claim
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1. A system for determining a multidimensional navigation state for a navigation platform based on radio navigation data transmitted by external terminals comprising:

  • a radio navigation data receiver for receiving and amplifying said radio navigation data embedded in noise;

    a bank of correlators for extracting said radio navigation data from said noise over a range of delay error, said correlators processing said radio navigation data and said noise to generate correlator output functions indicative of a degree of correlation for each correlator between said radio navigation data and a known internal replica signal, said correlator output functions being non-triangular M code correlator output functions;

    an estimator for estimating the radio navigation data signal power and noise power from the correlator output functions; and

    a measurement update unit including a nonlinear filter, said measurement update unit for updating the navigation state based on conditional moments of the navigation state calculated as a function of the estimated radio navigation data signal power and noise power, and the correlator outputs.

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