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Navigation system including an integrated electronic chart display

  • US 4,590,569 A
  • Filed: 10/14/1983
  • Issued: 05/20/1986
  • Est. Priority Date: 10/14/1983
  • Status: Expired due to Fees
First Claim
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1. A radio navigation system for navigating a vehicle, comprising in combination:

  • (a) position determining apparatus on-board said vehicle and including means for fixing the present geographical location of said vehicle and generating electrical signals corresponding to said present location;

    (b) means responsive to said electrical signals corresponding to said present geographical location of said vehicle for generating electrical signals of an electronic navigational chart for a predetermined localized area including the present geographical location of said vehicle, said chart including land contours, the adjoining land masses and other fixed objects within the localized area;

    (c) object detecting means on-board said vehicle and including means for generating electrical signals of an electronic map of the surrounding area including land contours, the adjoining land masses, other fixed objects as well as moving objects, and having a scale equal to the scale of said navigational chart;

    (d) means for establishing the geographic center of said map, and accordingly the object detecting means, independently of said object detecting means and generating offset signals corresponding to the vehicle'"'"'s real time position in longitude and latitude relative to said navigational chart as well as being oriented along a common compass reference;

    (e) means for electronically combining said signals of a navigational chart and said signals of an electronic map in response to said offset signals and generating composite signals therefrom wherein an accurate alignment of said map and said chart is inherently effected automatically; and

    (f) display means coupled to said combining means and being responsive to said composite signals and generating therefrom a composite map type visual display indicating said land contours, said fixed and moving objects for aiding said vehicle navigating through said localized area.

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