Second-order coefficient calibration method of accelerometer in platform inertial navigation system tested on double turntable centrifuge

Abstract

This paper proposes a method of accurately calibrating the second-order coefficient of accelerometer in platform inertial navigation system(PINS) being calibrated by double turntable centrifuge. Firstly, the errors of specific force caused by the angular rate error about spindle system of the centrifuge are derived, and the relationship between the PINS’s output displacements and the centrifuge errors, the accelerometer errors is developed. By way of this, a test plan of calibrating the second-order coefficient of accelerometer by the identification with twice least squares method is drawn up. Secondly, the test plan can separate the angular rate error and the second-order coefficient of accelerometer from the output displacement errors of the PINS’s, and eliminate the effect of the angular rate error on the calibration accuracy of the second-order coefficient, so the calibrating accuracy of the second-order coefficient is greatly raised. Finally, simulation results verified that the calibration accuracy of the second-order coefficient of the accelerometer can be raised to an order of 10^-7g/g².