North finding system

Details North finding system North finding system

1990-07-09

1991-10-29

Haroian, Harry N.

Geometrical instruments

Indicator of direction of force traversing natural media

Gyroscopically controlled or stabilized

33318, 33321, G01C 1938

Patent

active

050603922

ABSTRACT:
A gyrocompassing system intended for land based equipment requiring north reference information includes a novel gyrocompass implementation which enables utilization of high grade inertial sensors while achieving the desired goal of moderate cost. The north finding system is designed to provide high accuracy with fast reaction time over a wide temperature range without the aid of heaters and other auxiliary equipment. The arrangement is specifically configured to tolerate settling and/or oscillatory base motion without additional reaction time or degradation of gyrocompassing accuracy. The input axis of a gyroscope used in the system is skewed, so it can measure a component of gimbal rotation, thereby eliminating the need for independently measuring the relative gimbal angle. Absolute position alignment between the gimbal and the system case as is required is accomplished by an appropriate stop arrangement, which is an easier task than measuring the relative gimbal angle as aforenoted.

REFERENCES:
patent: 4461089 (1984-07-01), Krogmann
patent: 4686771 (1987-08-01), Beveventano et al.

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