Measurement of electromagnetic field components from arbitrarily oriented gyro platforms

Measuring the variations H and E of weak electromagnetic field components with a set of gyros on arbitrarily oriented platforms, with simultaneous measurement of orthogonal components of two known noncollinear physical vector quantities, is an effective method of determining natural electromagnetic fields with relatively simple apparatus and without electromagnetic interference from the platform orientating equipment. An analysis of the governing relations in two systems of coordinates, one system tied to the platform and one basal system (X-axis in direction of terrestrial magnetic field H, Z-axis in direction of terrestrial gravitational field G) reveals that from measurements of the components of vectors H and G in both systems of coordinates, it is possible to either determine the platform orientation in space or the components of variations H and E in the basal system of coordinates. An accuracy analysis of such measurements indicates that the angle error of platform orientation depends on the angle between vectors G and H. The error of H measurement, taking into account the mean level of its natural variation, is of the order of 0.5%.