Miniature north reference unit

Details Miniature north reference unit Miniature north reference unit

G - Physics

01

C

79/4

G01C 19/38 (2006.01)

Patent

CA 1067728

ABSTRACT OF THE DISCLOSURE Disclosed herein is a gyroscope operated in a strapped-down mode and mounted on a float assembly with its spin axis extending in a vertical direction. The float assembly is free to pivot through small angles about any horizontal axis but is constrained from rotating about the vertical spin axis to assure an accurate azimuthal reference between the gyroscope and the casing in which it is floating. The angle between an azimuthal reference line of the gyroscope and true north is obtained by measuring the magnitude of torque required to counteract precession of the gyroscope about a horizontal sensitive axis which would occur because of the horizontal component of the rate of rotation of the earth.

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