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Navigation system utilizing locus data compression

  • US 5,345,388 A
  • Filed: 07/30/1992
  • Issued: 09/06/1994
  • Est. Priority Date: 08/06/1991
  • Status: Expired due to Fees
First Claim
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1. A navigation system comprising:

  • map information memory means for storing map information to be displayed;

    position determination means for determining a present position of a moving body in which the navigation system is mounted to generate present position data;

    azimuth detection means for detecting a traveling azimuth of the moving body;

    locus data memory means for storing, as locus data which indicate a locus where said moving body has travelled in the past, the present position data at fixed periods or every movement of a fixed distance;

    azimuth change detection means adapted for monitoring a traveling azimuth detected by said azimuth detection means to judge a change in the traveling azimuth, and detecting as an azimuth changed position, the present position data when the traveling azimuth is changed;

    locus data compression means for compressing the locus data stored in said locus data memory means by selecting and leaving only locus data inside a predetermined range before and after the azimuth changed position and by erasing locus data outside said predetermined range; and

    display means adapted to obtain map information corresponding to the present position data from said map information memory means to display that map information and a present position, and to display the locus in the displayed map information by specifying a travel path to the azimuth changed position and a travel path from the azimuth changed position in the displayed map information according to the azimuth changed position and the travelling azimuth reproduced from the locus data stored in said locus data memory means.

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