线加速度计高次项系数校准不确定度仿真分析  

Simulation on Calibration Uncertainty of the High Order Coefficients of Linear Accelerometers

作　　者：宁菲[1] 李明海[1] 陈小伟[1] 王珏[1] 

机构地区：[1]中国工程物理研究院总体工程研究所,四川绵阳621900

出　　处：《计算机仿真》2013年第10期267-270,共4页Computer Simulation

基　　金：国家重大科学仪器设备开发专项-高精度惯性仪表校准检测装置研制及应用(2011YQ130047)

摘　　要：惯性导航和惯性制导用线加速度计常结合重力场翻滚法与精密离心机法进行校准。重力场校准的线性项及精密离心机输出加速度均影响到加速度计非线性系数的校准精度。理论推导了加速度计二次系数、三次系数表达式,采用蒙特卡罗仿真获得精密离心机校准高次系数分布,进而统计获得系数的相对标准不确定度。仿真结果表明,提高输出加速度的精度对加速度计校准具有重要的意义,且若重力场校准的线性系数不确定度值比精密离心机输出加速度相对标准不确定度小1个量级以上时,可忽略重力场校准对精密离心机校准的影响,对线加速度计校准精度的提高具有一定的指导意义。The linear accelerometers used in inertial navigation system are usually calibrated by precision centri- fuge testing combined with multipoint tumble testing under gravity. The precision of calibration is influenced by the centrifuge＇s acceleration and the linear coefficients calibrated in the tumble testing. Considered the errors of linear co- efficients calibrated by tumble testing and the acceleration of precision centrifuges, the formula and simulation of the second order coefficient and third order eoeffieient＇s uncertainty were presented. Monte - Carlo was used to simulate the second order coefficient and third order coeffieient＇s relative uncertainty. The results indicate that the precision of aceelerometers calibration can be improved significantly by improving the precision of the centrifuge. If the value of the linear coefficients＇ uncertainty by the tumble testing is at least one order smaller than the value of acceleration＇s relative uncertainty provided by the centrifuge, the influence of tumble testing under gravity can be ignored. The re- suits and methods in this paper can be used to improve the precision of calibration for the linear aeeelerometers.

关 键 词：校准不确定度 精密离心机 重力场翻滚 线加速度计 蒙特卡罗 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]