Direction sensor having an earth magnetism sensor and a rate gyr

Details Direction sensor having an earth magnetism sensor and a rate gyr Direction sensor having an earth magnetism sensor and a rate gyr

1991-11-06

1994-03-22

Black, Thomas G.

Boots, shoes, and leggings

364449, 340989, 340995, G06F 1550, G01C 1728

Patent

active

052970507

ABSTRACT:
The present invention involves a direction sensor and a navigation system containing the direction sensor. The direction sensor has an earth magnetism sensor and a rate gyro sensor that calculates a compensated direction by weighted means process of the outputs from the earth magnetism sensor and the rate gyro sensor. The compensated direction has a high detection accuracy similar to the rate gyro sensor over a short time period, but does not have an error accumulation of the rate gyro sensor during a long time interval because the rate gyro sensor is substantially calibrated with the accurate direction obtained by the averaging outputs of the earth magnetism sensor. The navigation system has distribution information of the magnetic disturbances to the earth magnetism on a map and it reduces the weighted mean ration to the earth magnetism sensor when the magnetic disturbance at the locating position is large. The accuracy of the compensated direction is further improved by excluding inaccurate outputs of the earth magnetism sensor.

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patent: 5109344 (1992-04-01), Kakihara et al.
patent: 5151862 (1992-09-01), Nakayama et al.

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