Navigation apparatus for vehicle

  • US 5,130,709 A
  • Filed: 04/16/1991
  • Issued: 07/14/1992
  • Est. Priority Date: 12/28/1987
  • Status: Expired due to Fees
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First Claim
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1. A vehicle-mounted navigation system comprising:

  • a map storage unit containing stored map data and means for displaying a desired map area image read from said map storage unit;

    travel distance selection means for detecting the distance travelled by the vehicle;

    present position calculating means for calculating a present position of the vehicle on a predetermined course responsive to the detected travel distance and means for displaying said calculated present position on said map area display;

    feature detection means for detecting a stationary feature as the vehicle passes over or under said stationary feature and for generating a detection signal for the detected feature said feature detection means comprising a camera which generates a color video signal and an image processing unit which converts said color video signal into detected color data;

    a database containing predetermined feature data for identifying said stationary feature, said predetermined feature data comprising predetermined color data for various road surface features;

    comparing means for comparing said detected color data with said predetermined color data to identify said detected stationary feature and for generating a feature representing signal;

    proximity determining means for determining the remaining distance between said calculated present position and a succeeding feature, for comparing said remaining distance with a constant and for generating a proximity signal when said remaining distance is equal to or smaller than said constant; and

    correcting means for correcting said displayed calculated present position responsive to said proximity signal and said feature representing signal.

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