Geometrical instruments – Indicator of direction of force traversing natural media – Gyroscopically controlled or stabilized
Patent
1989-08-11
1991-08-27
Haroian, Harry N.
Geometrical instruments
Indicator of direction of force traversing natural media
Gyroscopically controlled or stabilized
G01C 2118
Patent
active
050421565
ABSTRACT:
A navigation method and apparatus for reducing substantially the measurement errors such as accelerometer bias, gyro drift rate, gyro scale factor errors, and gyro sensing axis orientation uncertainty. The navigation apparatus includes a first gimbal for rotating a triad of gyroscopes and accelerometers about a first gimbal axis at a predetermined angular rate. The axis is positioned in a plane whose orientation is fixed in inertial space (as, for example, parallel to the earth's equatorial plane). The direction of rotation about the first gimbal axis is periodically reversed. A second gimbal is provided for rotating the triad of gyroscopes and accelerometers at a predetermined control angular rate. The second gimbal axis is directed along an axis orthogonal to the plane described above whose orientation is fixed in inertial space (as, for example, the earth's polar axis if this plane is parallel to the equatorial plane of the earth). The direction of rotation about the second gimbal axis is periodically reversed.
REFERENCES:
patent: 3091012 (1963-01-01), Gould
patent: 3258977 (1966-07-01), Hoffman
patent: 3281582 (1966-10-01), Fischer
patent: 3509765 (1970-05-01), Stevenson, Jr.
patent: 4017187 (1977-04-01), Schwartz
patent: 4179818 (1979-12-01), Craig
Haroian Harry N.
Kramsky Elliott N.
Litton Systems Inc.
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