Navigation system and gyroscopic device

Details Navigation system and gyroscopic device Navigation system and gyroscopic device

1996-11-27

1999-05-25

Cuchlinski, Jr., William A.

Data processing: vehicles, navigation, and relative location

Navigation

Employing position determining equipment

701208, 701210, 701221, G06F16500

Patent

active

059066539

ABSTRACT:
A processing apparatus within a navigation system comprises a track calculating portion for subsequently memorizing a bearing detected by a bearing sensor to calculate a track, and a map match processing portion for performing the map matching process. A position correcting portion corrects a vehicle position onto a road in accordance with road data 35 by the map match processing portion 34. The bearing correction is not effected when the bearing difference conditions are established although a bearing correcting portion 39 corrects the bearing showing the progressive direction of the vehicle into the link bearing of the road. The bearing difference condition is a condition where the bearing difference between the link bearing and the bearing showing the progressive direction of the vehicle is large, and there is a possibility of further increasing the error when the error of the bearing showing the progressive direction of the vehicle is large and the correction is effected in the link bearing. The offset correction can be carried out precisely with proper timing when a gyroscopic device is used as the bearing sensor.

REFERENCES:
patent: 4660037 (1987-04-01), Nakamura
patent: 4903212 (1990-02-01), Yokouchi et al.
patent: 5113185 (1992-05-01), Ichikawa
patent: 5317515 (1994-05-01), Matsuzaki

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