基于低精度离心机的平台惯导系统加速度计高精度系统级标定方法

High Precision Systematic Calibration Method for Accelerometer of Platform INS Based on Low Precision Centrifuge

高动态、大过载是未来导弹、飞行器的标志性特征,这一特征对惯导系统性能指标尤其是加速度计的性能指标要求尤为严苛。针对此,分析了平台惯导系统加速度计主要非线性误差(标度因数对称性和二次项系数)的传统离心标定方法的缺陷,提出了基于低精度离心机的平台惯导系统加速度计高精度系统级标定方法。该方法是利用惯导系统的速度和位置误差积分作为观测量进行Kalman滤波估计,不仅能对加速度计的非线性误差进行更有效估计,而且能克服传统离心标定方法对离心机的高精度要求。最后通过离心试验验证了该标定方法的有效性,试验结果表明,加速度计非线性误差补偿后的速度和位置误差小于补偿前相应误差的25%。

High dynamic and high overload are important features for future missiles and aircrafts. Which are particularly crit- ical to the performance of the INS, especially for accelerometer. By analysing the weaknesses of the traditional calibration method for accelerometer nonlinear coefficients （scale factor asymmetry and second-order coefficient） of platform INS, a high precision calibration method based on the low precision centrifuge is proposed. The method, which takes integration of velocity and position errors of platform INS as obseIvation, can not only get more effective estimation of accelerometer nonlinear coefficient, but also lower the requirements for centrifuge accuracy. Finally, the effectiveness of the method is verified through centrifuge tests. The experimental results show that the velocity and position errors are reduced by 25% after compensating the accelerometer nonlinear coefficient.