加速度计在精密离心机上的标定方法与误差分析  

Calibration method of accelerometer on precision centrifuge and its error analysis

作　　者：孙闯 任顺清[1] 王振桓[1] SUN Chuang;REN Shunqing;WANG Zhenhuan(Space Control and Inertial Technology Research Center,Harbin Institute of Technology,Harbin 150080,China)

机构地区：[1]空间控制与惯性技术研究中心哈尔滨工业大学,哈尔滨150080

出　　处：《中国惯性技术学报》2019年第1期121-128,共8页Journal of Chinese Inertial Technology

基　　金：装备预研基金项目(9140A09030313HT01121);国家自然科学基金青年科学基金(61703123)

摘　　要：为了提高加速度计非线性误差系数在离心机上的标定精度,应对离心机的误差源进行准确地分析和有效地分离。首先,通过分析双轴离心机的误差源建立了相应的坐标系,利用齐次变换法推导了加速度计在离心机上的精确比力输入并建立了加速度计的标定模型。其次,分析了相应误差项对加速度计零偏、标度因子和非线性误差项系数的标定影响,设计了加速度计在离心机上标定时的误差分离方法。最后,通过实验对加速度计的误差模型系数进行了辨识。结果表明,该方法能够准确分离出失准角误差和偏心误差,非线性误差系数的标定不确定度量级为10^(-4),能够有效提高加速度计的标定精度。In order to increase the calibration accuracy of the nonlinearity error coefficients of the accelerometer mounted on precision centrifuge, the error sources of the centrifuge should be accurately analyzed and effectively separated. Firstly, the corresponding coordinate systems are established by analyzing the error sources of the double-axis centrifuge. The accurate specific force input of the accelerometer on the tested centrifuge is derived by homogeneous transformation method, and the calibration error model of accelerometer is established. Then, the influence of corresponding error sources on calibrating the bias, scale factor and nonlinear error coefficients are analyzed, and the calibration method and the error separation technology are designed. Finally, the error model coefficients of the accelerometer are identified by experiments. The experiment results show that the misalignment error and the deflection of accelerometer effective center of mass are separated accurately. The proposed method can accurately separate out the misalignment error and eccentricity error, and the magnitude of identification uncertainty of nonlinear coefficients is 10-4, which can effectively improve the calibration accuracy of the accelerometer.

关 键 词：加速度计 标定 离心机 误差分析 

分 类 号：V241.531[航空宇航科学与技术—飞行器设计]