陀螺加速度计在线振动台上的二次项分离方法  

Method of quadratic term coefficient separation of pendulous integrating gyro-accelerometer on linear vibrator

作　　者：贺栋 严小军[1] 朱嘉婧 张沛晗 HE Dong;YAN Xiaojun;ZHU Jiajing;ZHANG Peihan(Beijing Aerospace Control Device Institute,Beijing 100854,China)

机构地区：[1]北京航天控制仪器研究所,北京100854

出　　处：《传感器与微系统》2020年第10期24-26,30,共4页Transducer and Microsystem Technologies

摘　　要：陀螺加速度计(PIGA)一般工作在低频、大过载环境下,其二次项误差本身很小。现有的重力场试验不能模拟其真实工作环境,由于激励不足难以精确测量PIGA的二次项。为解决在地面试验中精确测量PIGA的二次项误差系数,利用低频线振动台模拟了PIGA实际工作的低频、大过载环境,提出了一种分离PIGA非线性二次项的测试方法,并通过非线性回归分析理论对标定模型进行显著性检验。得到的模型相关指数R^2趋近于1和残余误差σ为3.935×10^-4。试验结果表明:所提方法可以有效分离PIGA二次项系数,标定的模型拟合效果好、系数辨识精度高。Pendulous integrating gyro-accelerometer(PIGA)generally operates in low-frequency and high-overload environment,and its quadratic error is very small.Considering the small input acceleration signal in gravity field testing,the non-linear error is too small to be measured accurately.A test method for the separation of PIGA nonlinear quadratic term on the low-frequency linear vibrator is presented,which is used to simulate the actual high overload environment.The index of model correlation R^2 approach 1 and residual errorσis 3.935×10^-4,non-linear regression analysis theory are used to test calibrated model.Test results show that this method can effectively separate the quadratic term coefficients of PICA.The model has good fitting effect and high identification precision.

关 键 词：陀螺加速度计(PIGA) 低频线振动台 二次项系数分离 非线性回归 相关指数 残余误差 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]