×

Vehicle location detecting system

  • US 4,807,127 A
  • Filed: 11/20/1987
  • Issued: 02/21/1989
  • Est. Priority Date: 12/10/1986
  • Status: Expired due to Term
First Claim
Patent Images

1. A vehicle location detecting method for detecting the location of a vehicle within a predetermined area, comprising the steps of:

  • a. outputting distance data at every predetermined interval, the distance data being representative of the distance that a vehicle has travelled,b. outputting heading angle data at every predetermined interval, the heading angle data being representative of the heading angle change of vehicle travel,c. storing road map data representative of roadways,d. computing a present location data from said distance data and said heading angle data, and a limit error of said present location data which is determined by errors in said distance data, in said heading angle data and in said road map data, and registering locations on the roadways, which roadways are located within said limit error of said present location data, as estimate locations,e. computing correlation coefficients corresponding to said registered estimate locations, andf. selecting a correlation coefficient whose error is smallest with respect to the roadway from said computed correlation coefficients and outputting the registered estimate location corresponding to said selected correlation coefficient as a present location.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×