高精度加速度计重力场标定试验方法

Calibration test method of high-precision accelerometer in gravitational field

为标定高精度(10-6)的加速度计,提出了一种在双轴转台上进行正交双加速度计标定的试验方案,建立了正交双加速度计的g2观测模型;分析了正交双加速度计的模型系数相关性,在此基础上基于D-最优试验设计方法,针对加速度计多位置试验中模型方程的特殊形式,利用信息矩阵推导出了该试验计划的解析解。仿真试验和实测数据的估计结果均表明:双表试验辨识结果的标准差较小,参数的估计精度较高,优于传统的单表试验方法,双表试验能提高高精度加速度计的标定精度。

A method of calibrating the dual orthogonal accelerometers（DOA） on a two-axis turning table was proposed to calibrate the high-precision accelerometer. A square-of-g observation model was built for the DOA and the correlation of the DOA model coefficients was analyzed. Based on the D- optimal experiment design, according to the special form of the model equation in the multi-position test of the accelerometers, an analytical solution of the experiment design was derived using the information matrix of equation. The simulation and experiment demonstrated that the standard deviation of the DOA method is less than, and its identification accuracy is better than that of the single accelerometer. So, the DOA method can enhance the calibration accuracy of the high-precision accelerometer.