Vehicle in-situ locating apparatus

Details Vehicle in-situ locating apparatus Vehicle in-situ locating apparatus

1989-12-05

1991-10-22

Chin, Gary

Boots, shoes, and leggings

364454, 340988, 340990, G06F 1550

Patent

active

050601628

ABSTRACT:
The apparatus includes a running distance sensor, a heading direction sensor based on terrestrial magnetism, and a map data base for identifying the road on which the vehicle is running. In implementing map matching for collating running data with map data, the difference between the heading direction and the road direction on the map is calculated so that it is underestimated on the basis of the angle with respect to magnetic north for specific sections memorized as map data or for all sections. The probability of erroneous matching is lowered and the vehicle is located accurately even in such places as bridges, elevated roadways, tunnels and slopes where the terrestrial magnetic azimuth deviates.

REFERENCES:
patent: 4470119 (1984-09-01), Hasebe et al.
patent: 4688176 (1987-08-01), Hirata
patent: 4796191 (1989-01-01), Honey et al.
patent: 4807127 (1989-02-01), Tenmoku et al.
patent: 4862398 (1989-08-01), Shimizu et al.
patent: 4879658 (1989-11-01), Takashima et al.
patent: 4887081 (1989-12-01), Iihoshi et al.
patent: 4924402 (1990-05-01), Ando et al.

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