Measurement error fitting method and system of rotary transformer

The invention provides a measurement error fitting method and system for a rotary transformer, and relates to the technical field of data processing, and the method comprises the steps: obtaining a rotation angle value of a stepping motor through the detection of an absolute encoder; obtaining a differential excitation signal; obtaining an excitation signal of an excitation winding in the preset multi-channel rotary transformer; a conditioning signal is obtained; the multi-channel rotary transformer is preset to output a rotation angle measurement value of a stepping motor under the excitation signal and the conditioning signal; a preset error analysis function is introduced to carry out error fitting analysis on the rotation angle measurement value with the minimum measurement error as the constraint, the measurement error refers to the difference value between the rotation angle measurement value and the rotation angle value, and the problem that in the prior art, due to the fact that the correction error a