Boots – shoes – and leggings
Patent
1990-11-01
1993-10-05
Chin, Gary
Boots, shoes, and leggings
364449, 33356, G06F 1550
Patent
active
052511391
ABSTRACT:
A system for measuring a traveling direction of a vehicle includes a geomagnetic sensor and a gyro sensor. The system utilizes first and second indicies for deriving the vehicle traveling direction. The first index is indicative of disturbance of a geomagnetic field on a short interval basis, and the second index is indicative of disturbance of the geomagnetic field on a long interval basis. The system further utilizes a correction value indicative of a drift error caused by the gyro sensor for deriving the vehicle traveling direction. The system varies a rate of dependence upon an output of the geomagnetic sensor and an output of the gyro sensor based on the first and second indicies and the correction value when calculating the vehicle traveling direction.
REFERENCES:
patent: 4862398 (1989-08-01), Shimizu et al.
patent: 5023799 (1991-06-01), Nakayama et al.
patent: 5040122 (1991-08-01), Neukirchner et al.
patent: 5067083 (1991-11-01), Nakayama et al.
Itoh Toshiyuki
Takano Kenji
Tsuda Hiroshi
Chin Gary
Nissan Motor Co,. Ltd.
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