Arrangements for correcting compasses

Details Arrangements for correcting compasses Arrangements for correcting compasses

G - Physics

01

C

33/91

G01C 9/00 (2006.01) G01C 17/00 (2006.01) G01C 19/38 (2006.01) G01C 21/00 (2006.01)

Patent

CA 1188886

INVENTORS: JOHN CLARKE WALLER and GREGORY CHARLES LEONARD SEARLE TITLE : "ARRANGEMENTS FOR CORRECTING COMPASSES" ABSTRACT OF THE DISCLOSURE A marine gyro compass output is corrected to take account of accelerations acting upon the ship in which it is installed by calculating about once per second a correction capable of expression by differential equations which are solved by numerical methods by taking small but finite time increments to linearise the equations with regard to time, the current calculated correction factor being applied to correct the gyro compass output many times per second. The corrections can take into account (a) ship north-south acceleration, (b) change in Coriolis acceleration, (c) earth rotation rate and (d) azimuth error for east-west speed. Furthermore, account can be taken of the constant characteristics of the particular gyro compass to be corrected in terms of its tilt limit, its period of damped oscillation, its damping and the characteristics of the compass electrolytic level which determines tilt.

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