When micro-inertial measurement unit（MIMU）is calibrated by centrifuge

integrated installation error and MIMU installation error of internal accelerometer group will cause actual centrifugal acceleration excitation of the accelerometer to be inconsistent with the set

input error is introduced

which affect the calibration precision.Based on reducing the influence of input error calibration

a calibration analysis method is proposed to eliminate input error of acceleration.The method is based on the symmetrical relation of installation error in the positive and negative input state of the MIMU accelerometer during the centrifuge calibration.The installation erro

r term is introduced into the error model equation

and the installation error term is eliminated by averaging the number of substitutions between the input and output in the two states.The error model coefficients of the accelerometer group is calculated by using the least square method

and compensated.Experiment verifies that the method greatly improved the precision of the accelerometer

and scale factor precision is improved by 3.62 %

cross-coupling is reduced from 1.4 % to 0.16 %

and the zero bias is reduced from 4.9 mg

n

to 0.9 mg

n

.