Error compensation of magnetic measurement system based on GMR sensor

This paper build a triaxial geomagnetic measurement system based on GMR sensors, then discussed non-orthogonal and zero drift error compensation of the three axis GMR sensor. Combine with the multi-coordinate system data fusion algorithms and inversion algorithms, we established a non-orthogonal error compensation model, then we calculated the compensation parameters by BP neural network algorithm. The compensation model achieved a good compensation effect, the non-orthogonal and zero drift error of the three-axis GMR sensor reduced to 0.8% from 7.86%.