激光陀螺误差分析的Allan方差法改进研究

针对传统Allan方差法分析激光陀螺误差特性过程中,不能合理解释方差中部分噪声项出现负值的情况,而采用阻尼振荡的分析方法能够对此给出合理解释,却又损失了辨识精度的问题,提出了一种基于动态Allan方差法理论的改进Allan方差法。该方法将阻尼振荡模型与动态Allan方差模型相结合,使得辨识结果的分析过程更加合理。激光陀螺零偏误差的辨识与分析结果表明:改进Allan方差法的辨识结果精度略高些,在改进Allan方差的三维分析图中可以显示出零偏中存在的数据突变情况,能够反应激光陀螺误差的动态特性。因此,改进Allan方差法更适用于激光陀螺误差特性的分析。

Research on the Allan Variance Improvement of Laser Gyroscope Error Analysis

As the traditional Allan variance method cannot properly explain the existance of negative values in some of the noise terms of variance in the analysis of the error characteristics of laser gyro,and the damped oscillation method can give a more acceptable explanation while bringing in the loss of the recognition accuracy,a modified method based on the Dynamic Allan Variance(DAVAR) theory is introduced for the analysis and identification of laser gyroe bias. The method combines the damped oscillation model with the dynamic Allan variance model,which makes the analysis of the identification results more reasonable. The identification and analysis of the bias error of laser gyro show that,the recognition results by modified Allan variance method have got slightly higher accuracy,and the sudden change of data in the bias can be shown in three-dimensional analysis chart of the modified Allan variance,which can reflect the error dynamic characteristics of laser gyro,and thus,the modified Allan variance method is more suitable for the analysis of laser gyro error characteristics.