Calibration accuracy of error model coefficients K₂ and K₃ of gyro accelerometer influenced by errors of centrifuge

In order to accurately calibrate second-order nonlinear error model coefficient K₂ and third-order coefficient K₃ of gyro accelerometer, firstly the coordinate systems were established on the centrifuge with a counter-rotating platform, and with error sources of centrifuge considered, accurate specific force input and angular velocity input of gyro accelerometer were derived. Then the contribution of each error of centrifuge to the calibration errors of K₂, K₃ were given according to the error model of gyro accelerometer. Through simulation, the practical impact of each error on the calibration accuracy of K₂, K₃ is shown quantitatively, and the calibration accuracy of error model coefficients K₂, K₃ of gyro accelerometer can be improved by error compensation. Meanwhile, the centrifuge errors which should be focused on when calibrating accelerometers with different accuracies are given. The simulation results also show that it is unnecessary to adjust the center of gyro accelerometer when centrifuge with the counter-rotating platform is used for its calibration. In addition, it has little effect on calibration when the magnitudes of the spindle speed and the angular velocity vector of reversal platform rotary axis are not exactly equal, and their directions are not completely opposite.