A High Precision Accelerometer Calibration Method

Abstract

Centrifuge calibration can continuously provide centripetal acceleration of more than 1g, and can fully stimulate the high-order nonlinear term of accelerometer. It has become the most commonly used method to calibrate high-precision accelerometer. However, affected by the error of test equipment, the accuracy of the traditional centrifuge calibration model is low, which leads to the low calibration accuracy of the traditional calibration method. Therefore, a high-precision accelerometer centrifuge calibration method is proposed in this paper. By introducing the idea of semi-parametric regression in mathematical statistics, the system error caused by the error of test equipment is regarded as a non-parametric vector, and a high-precision semi-parametric calibration model including the error of test equipment is established. Then the natural spline semi-parametric estimation method is used to estimate the calibration parameters and the non-parametric vector, so as to eliminate the influence of test equipment error on the calibration accuracy of calibration parameters. Simulation results show that the proposed method can effectively estimate the system error caused by the error of test equipment, and has higher calibration accuracy than the traditional calibration method.

Keywords

• |accelerometer|centrifuge calibration|test equipment error|semi-parametric regression|non-parametric vector|inertial navigation