改进Allan方差法在船用光纤陀螺随机漂移分析中的应用

随机漂移是影响船用光纤陀螺精度的主要因素。对随机漂移进行建模并在系统中加以补偿是提高船用光纤陀螺及其导航系统精度的关键。本文对可用于精密仪器随机漂移研究的Allan方差法加以改进，将数字信号处理中加窗函数的方法应用于计算Allan方差，解决了某些频段内由于频混造成的随机漂移表征不唯一的问题。通过对光纤陀螺仿真数据进行计算，得出各种随机漂移的系数，仿真试验表明这是对光纤陀螺随机漂移进行研究的有效方法。

Improving Allan Variance Method Applied in Analysis of Marine FOG Random Drift

Modeling of random drift and compensating in navigation system is the key of improving the performance of marine FOG. In the paper, Allan variance method that can be applied to the random drift research of any precision instrument is modified with the application of window function to resolve the non-unique characterization of random drift caused by frequency alias. The measured data of FOG are researched and various coefficients of random drift are also obtained. The experiments have proved that this method is effective to evaluate FOG random drift.