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Navigation system using satellite signals

  • US 5,265,025 A
  • Filed: 07/05/1991
  • Issued: 11/23/1993
  • Est. Priority Date: 07/11/1990
  • Status: Expired due to Fees
First Claim
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1. A navigation system using satellite radio signals comprising:

  • a GPS receiver station for receiving global positioning system (GPS) signals from a plurality satellites;

    decision means for determining if a number of the plurality of satellites in radio range of a moving body is four or more;

    an atmospheric pressure sensor for measuring atmospheric pressure at a location of the moving body;

    an altitude deviation calculating section for calculating an atmospheric pressure deviation produced by movement of the moving body from the measured atmospheric pressure and for determining an altitude deviation of the moving body from the calculated atmospheric pressure deviation;

    an altitude storage section for storing altitude data of the moving body; and

    position calculating means for calculating two-dimensional position data of the moving body from the GPS signals and altitude data based on the GPS signals when the number of the plurality of satellites is four or more and for calculating the two-dimensional position data of the moving body from the GPS signals, stored altitude data, and the altitude deviation when the number of plurality of satellites is three or less.

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