光纤陀螺随机误差特性ThêoH辨识

摘要

随机误差特性分析是光纤陀螺进入工程应用阶段的关键技术.针对Allan方差、总方差、Thêo1 (Theoretical variance #1)等分析方法的不足,以Thêo1为基础,通过偏差消除获得ThêoBR(Bias-removed ver?sion of Thêo1),并将其与Allan方差合成,得到光纤陀螺随机误差特性分析的ThêoH(Hybrid-ThêoBR)法.通过计算重叠Allan方差、总方差、Thêo1以及ThêoH的等效自由度,结合仿真和实测信号的随机误差特性分析实验,证明ThêoH法不仅提高了Allan方差估计的置信度,且解决了Thêo1估计有偏的问题,表明了该方法是目前能够有效辨识光纤陀螺随机误差特性的最佳方法.%Analysis of random error properties was the key of engineering development for fiber optic gyroscope (FOG). Aimed at disadvantages of Allan variance,total variance and Thêo1,ThêoBR was given based on Thêo1 by correcting the bias between Thêo1 and Allan variance. The ThêoH was obtained by integrating Allan variance with ThêoBR. The equivalent degrees of freedom of Allan variance,total variance,Thêo1 and ThêoH were calculated and random error properties of simulation experiment and test signal were analyzed. ThêoH could solve problems of low-er confidence coefficient of Allan variance and bias of Thêo1,which was the best method to analyze random error properties for fiber optic gyroscope at present.