METHOD OF DETERMINATION AND COMPENSATION OF INCLINOMETER MAGNETIC DEVIATION Russian patent published in 2002 - IPC

FIELD: precision instrumentation engineering; applicable in improved determination of azimuth orientation of movable object using three-axis flux-gate inductive transducers and accelerometers. SUBSTANCE: method is realized with use of three-axis inductive transducer in entire rotation sphere of inclinometer including steps: determination of deviation error of azimuth during calibration, approximation of azimuth deviation error by results of calibration by Fourier harmonic series (including determination of coefficients of series by any suitable method, for instance, by method of least squares), compensation of azimuth deviation error in inclinometer working conditions algorithmically in computer. Azimuth deviation error is determined during calibration depending on all three angles of inclinometer orientation (azimuth, longitudinal rotation and zenith). Approximation is effected by continuous dependence directly on angle of longitudinal rotation by Fourier harmonic series up to 7-th order. Approximation is effected by continuous dependence on azimuth angle by Fourier harmonic series, at least, to 5-th order. Approximation is effected by discontinuous dependence of error on zenith angle. For which purpose, two above described operations are carried out on different zenith angles alternating every 10-15 dwg for determination of dependence on azimuth and angle of longitudinal rotation. In this case, formed on each zenith angle is respective set of coefficients B_0,0, B_1,0...B_10,14, which is stored in configuration file. EFFECT: higher accuracy of azimuth determination.