Principle of all-angle mass-unbalanced modulation reading in ESG and its error analysis

The paper studied the principle of the all-angle MUM(Mass-Unbalanced Modulation) reading realized through synchronous demodulation,discussed the factors that influenced the reading precision,and analyzed the reading errors resulted from the non-orthogonality of the electrodes-fixed frame and the inconsistent between the scale factors of different measuring channels.The results revealed that 1% deviation of scale factor in a certain axis would result in an angle error of about 17′,and the reading error caused by the non-orthogonal of the electrodes-fixed frame was at about the same level as the misalignment.In the applications,it’s necessary to improve the precision of the MUM's all-angle reading through building up compensation model and compensating the errors in real time.