Gyrocompass

Details Gyrocompass Gyrocompass

1980-12-01

1983-04-12

Little, Willis

Geometrical instruments

Indicator of direction of force traversing natural media

Gyromagnetic compass

33324, 33326, G01C 1938

Patent

active

043793657

ABSTRACT:
A gyrocompass including a first gimbal, a gyro motor mounted in the first gimbal and including a gyro rotor mounted to rotate about a horizontally alignable spin axis, a pendulous body in which the first gimbal is mounted to be rotatable about a vertically alignable axis of rotation, a housing in which the body is rotatably suspended, a verticality device associated with the body for allowing the body to assume an orientation in the housing in which the axis of rotation is vertical, and a follow-up device including a pickup mounted for sensing the angular position, about the axis of rotation, of the gimbal relative to the body and a drive connected for rotating the body relative to the housing about the axis of rotation in dependence on the position sensed by the pickup. The drive can be constituted by a stepping motor constructed to rotate in highly uniform steps and simultaneously serving to provide an indication of the angular position of the body relative to the housing about the axis of rotation. Alternatively, the drive can be constituted by a stepping motor constructed to rotate in highly uniform steps, the follow-up device can include a restraining circuit and a torquer connected between the pickup and the first gimbal for restraining the first gimbal at a defined angular position, about the axis of rotation, relative to the body, the restraining circuit providing a signal representative of the angular velocity of the first gimbal about the axis of rotation, and the gyrocompass can further include a unit for determining the direction to true north from signals representative of the angular velocity.

REFERENCES:
patent: 3292269 (1968-12-01), Brugger
patent: 3997975 (1976-12-01), Knapp
patent: 4055901 (1977-11-01), Ishii
patent: 4283960 (1981-08-01), Quermann

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