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Navigation apparatus and matching method for navigation

  • US 4,989,151 A
  • Filed: 02/17/1989
  • Issued: 01/29/1991
  • Est. Priority Date: 02/23/1988
  • Status: Expired due to Term
First Claim
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1. A navigation apparatus which is carried on a vehicle, computes present positions of the vehicle, and visually presents the computed present positions, comprising:

  • map data storing means for storing data of a map to be displayed, said map including at least one reference point, said map data storing means storing surveyed data corresponding to said reference point, the surveyed data being data which indicates a previously determined absolute position of the reference point;

    sensor means for sensing at least a speed and moving direction of the vehicle, said sensor means including a speed sensor and a direction sensor;

    position calculating means for calculating present position data representing a present position of the vehicle on the basis of the data collected by said sensor means;

    display means for displaying a map based on the map data stored in said map data storing means, and for displaying the present position of the vehicle as a mark overlaid on the displayed map, based on the present position data calculated by said calculating means;

    key-in means for generating a passing signal indicating that the vehicle has actually passed said reference point, through operation of a predetermined key; and

    position correcting means includes first correcting means for, when receiving said passing signal, comparing the surveyed data of a plurality of reference points stored in said map data storing means with the present position data calculated by said position calculating means, selecting the surveyed data of a reference point of which the surveyed data corresponds to the smallest difference between the reference point and the present position data, and correcting said present position data so that it corresponds to said selected surveyed data.

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