四加速度计组合的测试方法研究

Study on Test Methods of Four Integrated Accelerometers

探讨了将四只加速度计在分度头上标定其误差模型系数的方法。通过推导分度头角位置误差与各加速度计输出、误差模型系数之间的关系,计算出分度头角位置误差不影响标定因子的标定精度,分度头角位置误差的二次及以上谐波成分对加速度计误差模型系数的标定结果也没有影响,即仅有角位置误差的一次谐波影响标定精度。针对分度头角位置误差进行检测,可分离出角位置误差的一次谐波,将其进行补偿后可进一步提高误差模型系数的标定精度。仿真分析验证了该测试方法的有效性。

A method of calibrate the error model coefficients of four accelerometers which equal - spaced installed on inde- xing table was researched in this paper. The relationships between angular position errors of indexing table, the outputs of accelerometers and the error model coefficients were derived, based on which the identification method for error model coef- ficients of aceelerometer was studied, the results show that the angular position errors have no impacts on the calibration ac- curacy of scale factors, and the second - order or higher order harmonic components of angular position errors have no im- pacts on the other error model coefficients except the first - order harmonic. The first - order harmonic of indexing table＇ s position errors can be measured, and the calibration accuracy of error model coefficients can be further improved by com- pensation for the first - order harmonic errors. The effectiveness of the proposed test method was verified by simulation analysis.