Inertial sensor unit

Details Inertial sensor unit Inertial sensor unit

1997-05-08

1998-07-14

Fulton, Christopher W.

Geometrical instruments

Indicator of direction of force traversing natural media

Gyroscopically controlled or stabilized

33318, G01C 1938

Patent

active

057785430

ABSTRACT:
An inertial sensor unit for determining north, has a housing and a positioning gimbal rotatably mounted in this housing about a substantially vertical axis. A releasable, cooperating detent mechanism defines three fixed angular detent positions of the positioning gimbal about the substantially vertical axis relative to the housing. The positioning gimbal is successively rotated into the three detent positions. A fiber optical gyro is mounted on the positioning gimbal. The input axis forms an acute angle with a substantially horizontal axis orthogonal to the above mentioned substantially vertical axis. A signal processing system is provided, to which the signals generated by the fiber optical gyro in the three detent positions are applied. The signal processing system provides, therefrom, the angle between a reference direction and north.

REFERENCES:
patent: 3898744 (1975-08-01), Johnston
patent: 5060392 (1991-10-01), Grasso
patent: 5187870 (1993-02-01), Abe et al.
patent: 5416976 (1995-05-01), Hane et al.
patent: 5566461 (1996-10-01), Wick et al.

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