Calibration Method of Accelerometer's High-Order Error Model Coefficients on Precision Centrifuge

This paper presents a new calibration method of the accelerometer tested on a precision centrifuge to further enhance the calibration accuracy of the high-order error model coefficients. To eliminate the influence of dynamic and static error sources of precision centrifuge on calibration accuracy, nine coordinate systems are established considering the errors of a centrifuge, which are propagated by homogeneous transformation, and the accurate specific forces acting on three axes of the tested accelerometer are obtained. Based on the error model and the accurately computed input specific forces of the accelerometer, the indicated outputs of the tested accelerometer are derived, and with the combinations of indicated outputs of six calibration position pairs, a calibration model of the accelerometer is established. By designing a test plan of 12 positions under three mounting modes and using the least-squares method, all the high-order error model coefficients of the tested accelerometer are calibrated accurately. In the calibration method, the dynamic errors of precision centrifuge are introduced into the observation vectors, and the static errors are introduced into the vectors to be identified; the influence of centrifuge errors is automatically eliminated. Error analysis implies that the calibration accuracy is improved greatly.