Vehicle location detecting system
First Claim
1. A vehicle location detecting system comprising:
- a heading sensor for detecting changes in the heading of a vehicle as it moves over streets;
a distance sensor for detecting distances traveled by said vehicle;
a road map memory for storing a map data base;
location detecting means for detecting a first estimated location of said vehicle; and
correction arithmetic means for calculating a second estimated location of said vehicle from said distances detected by said distance sensor and said changes in said heading detected by heading sensor, for detecting an optimum vehicle location of said vehicle by calculating a degree of similarity between said second estimated location and said map base obtained from road map memory, for calculating a probability area of said first estimated location including an actual location of said vehicle and a probability area of said optimum vehicle location including an actual location of said vehicle, and for correcting said second estimated location with the aid of said first estimated location in accordance with said degree of similarity, said probability area of said first estimated location and said probability area of said optimum vehicle location.
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Accused Products
Abstract
A vehicle location detecting system comprising:
a heading sensor for detecting changes in the heading of a vehicle as it moves over streets;
a distance sensor for detecting distances traveled by the vehicle;
a road map memory for storing a map data base;
location detecting unit for detecting a first estimated location of the vehicle; and
correction arithmetic unit for calculating a second estimated location of the vehicle from the distances detected by the distance sensor and the changes in the heading detected by the heading sensor, for detecting an optimum vehicle location of the vehicle by calculating a degree of similarity between the second estimated location and the map data base obtained from road map memory, for calculating a first probability area of the first estimated location including an actual location of the vehicle and a second probability area of the optimum vehicle location including an actual location of the vehicle, and for correcting the second estimated location with the aid of the first estimated location in accordance with the degree of similarity, first probability area and second probability area.
85 Citations
6 Claims
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1. A vehicle location detecting system comprising:
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a heading sensor for detecting changes in the heading of a vehicle as it moves over streets; a distance sensor for detecting distances traveled by said vehicle; a road map memory for storing a map data base; location detecting means for detecting a first estimated location of said vehicle; and correction arithmetic means for calculating a second estimated location of said vehicle from said distances detected by said distance sensor and said changes in said heading detected by heading sensor, for detecting an optimum vehicle location of said vehicle by calculating a degree of similarity between said second estimated location and said map base obtained from road map memory, for calculating a probability area of said first estimated location including an actual location of said vehicle and a probability area of said optimum vehicle location including an actual location of said vehicle, and for correcting said second estimated location with the aid of said first estimated location in accordance with said degree of similarity, said probability area of said first estimated location and said probability area of said optimum vehicle location. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification