Geometrical instruments – Indicator of direction of force traversing natural media – Gyroscopically controlled or stabilized
Patent
1989-03-29
1990-05-15
Cuchlinski, Jr., William A.
Geometrical instruments
Indicator of direction of force traversing natural media
Gyroscopically controlled or stabilized
33317D, G01C 1938
Patent
active
049245937
ABSTRACT:
A two-axis platform comprises an azimuth gimbal rotatable about an azimuth axis. In the azimuth gimbal an inner gimbal is mounted about an axis. A two-axis gyro having input axes and a spin axis is located in the inner gimbal. The spin axis is always maintained horizontal by a torquer which is controlled by a level sensor. By the horizontal component of the rotary speed of the earth, which acts on the input axis of the gyro, the spin axis is rotated into North through the torquer. The azimuth angle of the spin axis is measured in a first position for elimination of the influence of gyro drifts including axial mass unbalance. Then, azimuth gimbal and inner gimbal are simultaneously rotated by 180.degree. about their axes. Subsequently, the azimuth angle is measured again, to which the spin axis is adjusted. The middle between these positions provides a North indication compensated for gyro drifts. Furthermore, means for determination of errors due to deviations of the azimuth axis from the vertical are described.
REFERENCES:
patent: 3938256 (1976-02-01), Crocker, Jr.
patent: 4158261 (1979-06-01), Auer
patent: 4379365 (1983-04-01), Riethmuller et al.
patent: 4442723 (1984-04-01), Auer
patent: 4584426 (1984-07-01), O'Conner et al.
Bernard Walter
Renker Horst
Bodenseewek Geratetechnik GmbH
Cuchlinski Jr. William A.
Dowling William C.
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