基于动态Allan方差的机抖激光陀螺随机误差研究

Research on Stochastic Errors of Dithered Ring Laser Gyroscope Based on Dynamic Allan Variance

为了更准确地评价高精度激光陀螺(RLG)的性能,提出了采用动态Allan方差(DAVAR)对高精度二频机械抖动激光陀螺实测数据进行分析的新方法。详细介绍了DAVAR的基本原理,并将其用于机抖激光陀螺随机误差的研究。结果表明,DAVAR分析方法不仅能细化、辨识机抖陀螺各项随机误差,同时确定各项误差占总误差的比重,而且可以分析陀螺随机误差随时间变化的稳定性。与Allan方差分析方法相比,DAVAR更为全面地表征了机抖激光陀螺的随机误差特性。

In order to evaluate the performance of high-accuracy ring laser gyroscope（RLG） more precisely,a new method of analyzing the collecting data of high-accuracy dithered RLG using dynamic Allan variance（DAVAR） is proposed.The theory of DAVAR is introduced in detail and applied in the study of stochastic errors in dithered RLG.The result shows that the analysis method of DAVAR can not only refine and identify RLG′s stochastic error terms,while confirming the ratio of each error term to the overall error,but also analyze the stability of RLG′s stochastic errors.Compared with Allan variance,DAVAR can represent the characterization of stochastic errors in RLG more completely.