GPS receiver with cross-track hold

  • US 6,574,558 B2
  • Filed: 05/24/2002
  • Issued: 06/03/2003
  • Est. Priority Date: 04/25/1996
  • Status: Expired due to Term
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First Claim
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1. A system for determining position information for a vehicle traveling along a route using only three GPS satellites, said system comprising:

  • means for obtaining along-track, cross-track and time data from the three available satellites;

    means for estimating altitude data; and

    means for processing the along-track, cross-track and time data and the estimated altitude data and outputting a navigation solution indicative of the position of the vehicle.

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