GPS/self-contained combination type navigation system

  • US 4,903,212 A
  • Filed: 03/11/1988
  • Issued: 02/20/1990
  • Est. Priority Date: 03/13/1987
  • Status: Expired due to Term
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First Claim
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1. A global positioning system (GPS)/self-contained combination type navigation system for a moving object comprising:

  • self-contained type positioning means for acquiring self-contained type positioning information of the moving object;

    GPS type positioning means for acquiring GPS type positioning information from GPS navigation data transmitted from a plurality of satellites arranged for constituting the global positioning navigation system;

    correcting means for producing a correction signal to be supplied to the self-contained type positioning means based upon the GPS type positioning information, whereby corrected self-contained type positioning information is derived from the self-contained type positioning means;

    present-position determining means for determining a present position of the moving object by processing one of said corrected self-contained type positioning information and GPS type positioning information, depending upon a reception condition of said GPS positioning information;

    map data memory means for previously storing map data required for navigating the moving object; and

    display means for displaying the present position of the moving object superimposed on the map data by receiving the output of the present-position determining means and the map data from the map data memory means.

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