Abstract: In magnetic sensor system there are errors (caused by nonorthogonality error, different sensitivity error, and zero-shift errors of single triaxial magnetometer) and misalignment errors of the coordinate systems of triaxial magnetometers. To overcome this problem, a calibration method of magnetic sensor system based on linear error model is proposed. For single triaxial magnetometer, a linear error model about nonorthogonality, different sensitivities and zero-shifts is set up; and for misalignment of coordinate systems, a linear error model about rotation angle of coordinate systems is set up. The error parameters of the magnetic tensor system can be got by generalized inverse. Calibration of the magnetic tensor system can be realized by putting these error parameters into the measuring data. Measuring experiments prove that the calibration method can effectively reduce the errors of single triaxial magnetometer and misalignment errors of the coordinate systems of triaxial magnetometers.

Key words: automatic control technology, magnetic tensor, calibration, linear error model, rotation angles of coordinate system