Gravitation-inertial compass sensitive element movement dynamics research

Interest in the dynamics of gravitation-inertial forces and the effect on a solid vibrating along a vertical line, has been stimulated by the work of G.A.Shvetsov (1989) which suggests the application of the attitude of the resulting Coriolis forces as a base (compass) direction along an East-West line. The accuracy of a gravitation-inertial compass (GIC) is quite dependent on base line attitude single-valuedness, which is formed by a sensitive element (SE), taking part simultaneously in two movements: vibrating along vertical line and rotating together with Earth. The limited length pendulum with a spherical hanger is selected as a SE. Calculations show that for an increase of base attitude defining accuracy it is necessary to increase the solid vibration along vertical line frequency, and it is desirable to define the base attitude East-West during one period of vertical vibrations. Realization of these recommendations allows the authors to increase considerably the accuracy of gravitation-inertial compass designed by them