Patent ID: 7865311
Filing Date: 2011-01-04
Classification: G01C

Abstract:
1. A method for determining true meridian comprising the following stages: rotating vessels making part of a sensor for measuring horizontal acceleration by means of, for example, an electric motor, around the vertical of a mobile object, the said vessels comprising pressure determination points which being positioned symmetrically relative to the vertical mentioned, determining a ground speed vector of the mobile object by any of the known ways, determining accelerations by the said sensor for measuring horizontal acceleration along its axis of sensitivity, the accelerations which being produced due to changes in the projection of the ground speed vector of the mobile object on the axis of sensitivity and due to changes in the projection of a linear speed vector of the mobile object on the said axis of sensitivity, the said linear speed being caused by the rotation of a heavenly body, more specifically the terrestrial globe, creating counteraction along the said axis of sensitivity, equal by module and oppositely directed to action which produced by the varying projection of the ground speed vector of the mobile object, determining the direction of the linear speed vector by a zero signal of the varying linear acceleration which being produced due to change in the said projection of the linear speed vector on the said axis of sensitivity of the sensor for measuring horizontal acceleration, determining a true heading of the mobile object, autonomous determining a true meridian of the mobile object by an electric motor in accordance with the said true heading of the mobile object.