An integrated calibration method for the cross-shaped magnetic gradiometer

The measurement accuracy of a magnetic gradiometer relies on magnetometer consistency, accuracy, and assembly technology. traditional methods calibrate error, misalignment the interference field independently. However, after long time work, calibration parameters will inevitably change. Furthermore, it waste lot manpower material resources if is disassembled calibrated step by step. Given above problems, novel attitude-independent algorithm using limited number points proposed, which can effectively overcome distortion does not rely reference magnetometer. For cross-shaped gradiometer, simulation results show that error integrated reduced to less than 8% before calibration. test suggest gradient are even up 1.5 µT/m, whereas 100 nT/m.