光纤陀螺随机误差特性ThêoH辨识

ThêoH Analysis of Random Error Properties for FOG

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Thêo BR(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Thêo H(Hybrid-Thêo BR)法。通过计算重叠Allan方差、总方差、Thêo1以及Thêo H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Thêo H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,Thêo BR was given based on Thêo1 bycorrecting the bias between Thêo1 and Allan variance. The Thêo H was obtained by integrating Allan variance withThêo BR. The equivalent degrees of freedom of Allan variance,total variance,Thêo1 and Thêo H were calculated andrandom error properties of simulation experiment and test signal were analyzed. Thêo H could solve problems of low-er confidence coefficient of Allan variance and bias of Thêo1,which was the best method to analyze random errorproperties for fiber optic gyroscope at present.