数字闭环光纤陀螺温度误差分析

Analysis of temperature errors in digital closed-loop fiber optic gyroscope

分析了数字闭环光纤陀螺温度误差的来源,指出温度误差主要包括温度噪声、标度因数漂移、偏置漂移。提出一种基于离散小波变换的分离陀螺温度噪声和温度漂移的方法,利用该方法对测试数据进行了分析,证实了在零偏稳定性大于0.3(°)/h的光纤陀螺中,温度漂移是主要温度误差。将简化的光纤陀螺等效相位模型与温度敏感参数模型结合得到光纤陀螺温度漂移误差分布模型,利用该模型分析了影响温度漂移误差的各因素,并对主要因素进行了测试和分析。最后总结了抑制温度漂移误差的几点措施。

The cause of the temperature errors in digital close-loop fiber optic gyroscopes （FOG） was analyzed. The temperature errors mainly included temperature noise,scale factor drift, and bias shift. A method for separating the temperature noise from temperature drift of the FOG, which was based on discrete wavelet transformation, was presented. The method was used to analyze the test data. It is evidenced that temperature drift is the main temperature error when the zero bias instability of FOG was higher than 0.3 （°）/h. Through combination of the simplified effective phase model with the temperature-sensitivity parameter model of FOG, its distribution model of temperature drift error was obtained. From this model, the factors that influence the temperature drift error were analyzed. And the main factors were tested and discussed. In the end, several measures to suppress the temperature drift error were summarized.