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Navigation system for vehicles including present position calculating means

  • US 5,890,092 A
  • Filed: 01/13/1998
  • Issued: 03/30/1999
  • Est. Priority Date: 09/01/1994
  • Status: Expired due to Fees
First Claim
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1. A navigation system for a vehicle, comprising:

  • receiving means for receiving a signal from a satellite;

    heading calculating means for calculating heading of the vehicle based upon a signal from said receiving means;

    satellite position sensing means for sensing the position of the satellite based upon the signal from said receiving means;

    traveling speed sensing means for sensing traveling speed of the vehicle;

    heading error estimating means for estimating error in the heading, obtained by said heading calculating means, based upon the traveling speed obtained by said traveling speed sensing means and the position of the satellite obtained by said satellite position sensing means; and

    judging means for judging whether the estimated heading error, which has been estimated by said heading error estimating means, is less than a predetermined value;

    wherein the heading calculated by said heading calculating means is employed when the estimated heading error is less than the predetermined value.

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