FIELD: investigation of trajectories of oil, gas and geothermal wells and iron ore and other drill-holes. SUBSTANCE: measurements are conducted under mode of integration of angular velocity by two-degree-of-freedom gyro and accelerometer in several orientations. Control measurement is performed with orientation of one of sensitivity axes of gyro and accelerometer in apsidal plane. In process of measurement systematic components of error of gyro are compensated. EFFECT: expanded operational capabilities, decreased mass and size characteristics, energy consumption, increased accuracy of measurements. 2 cl, 4 dwg
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