Survey apparatus and method employing rate-of-turn and free gyro

Details Survey apparatus and method employing rate-of-turn and free gyro Survey apparatus and method employing rate-of-turn and free gyro

1979-06-25

1981-11-03

Stephan, Steven L.

Geometrical instruments

Indicator of direction of force traversing natural media

Borehole direction or inclination

33323, E21B 4724, G01C 1900

Patent

active

042977908

ABSTRACT:
Survey apparatus and method employs a free gyroscope for fast determination of azimuth, free gyroscope alignment being periodically corrected by a rate gyroscope which is periodically rotated for accurate azimuth determination. An accelerometer is also usable in conjunction with the gyroscopes for tilt determination. More generally, method and means is provided for calibrating (initially or periodically) an angle or position reference device.

REFERENCES:
patent: 2309905 (1943-02-01), Irwin et al.
patent: 3753296 (1973-08-01), Van Steenwyk
patent: 4192077 (1980-03-01), Van Steenwyk et al.
patent: 4199869 (1980-04-01), Van Steenwyk
patent: 4238889 (1980-12-01), Bartiac

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