Apparatus and method for correcting an offset value contained in

Details Apparatus and method for correcting an offset value contained in Apparatus and method for correcting an offset value contained in

1992-11-20

1994-01-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

364450, 340995, G01V 904

Patent

active

052784240

ABSTRACT:
A heading of a vehicle is detected by correcting an output of a gyro with an offset value stored in an offset memory. A location detecting unit estimates a current location of the vehicle by dead reckoning. When the vehicle continues to travel over a predetermined period of time, the headings of links before and after the current location of the vehicle are read out of a road map memory, and a difference between the two link headings is detected as a first heading change amount. The location detecting unit accumulates outputs of the gyro obtained during a period corresponding to the first heading change amount after the offset correction, and this accumulated value is detected as a second heading change amount. Based on the first and second heading change amounts, a new offset value is calculated. This new offset value is stored in the offset memory.

REFERENCES:
patent: 4890233 (1989-12-01), Ando et al.
patent: 5072396 (1991-12-01), Fitzpatrick et al.
patent: 5119301 (1992-06-01), Shimizu et al.
Patent Abstracts of Japan, vol. 12, No. 359 (P-762) Sep. 27, 1988 & JP-A-63 109 315 (Pioneer Electronic Corp.) May 14, 1988.
Patent Abstracts of Japan, vol. 15, No. 451 (P-1276) Nov. 15, 1991 & JP-A-31 91 812 (Sumitomo Electric Ind. Ltd.) Aug. 21, 1991.

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