Instrument for the automatic determination of North direction

Details Instrument for the automatic determination of North direction Instrument for the automatic determination of North direction

1982-10-29

1984-07-24

Haroian, Harry N.

Geometrical instruments

Indicator of direction of force traversing natural media

Gyroscopically controlled or stabilized

G01C 1938

Patent

active

044610890

ABSTRACT:
By means of a two-axis, electrically restrained gyro with vertical spin axis, North direction is determined from the ratio of the horizontal components of the angular rate of the earth. The gyro is rotatable about a vertical axis into 0.degree.-, 90.degree.-, 180.degree.- and 270.degree.-positions. The signals thus obtained are stored. A signal processing circuit operating with various differences of these signals and ratios of such differences provides the North deviation unaffected by gyro drift and scale factor error.

REFERENCES:
patent: 3279086 (1966-10-01), Schlitt et al.
patent: 4399365 (1983-04-01), Riethmuller

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