光纤陀螺零偏误差特性及噪声分析方法研究

光纤陀螺为典型的光纤干涉仪，非互易误差主要是由各类寄生干涉引起，零偏误差具有明显的周期性特征。结合Allan方差分析方法，发现由寄生干涉引入的正弦噪声为其零偏误差的主要来源。通过加入正弦噪声进行仿真计算和分析，发现光纤陀螺Allan方差曲线中“速率斜坡和速率随机游走”部分实际是由正弦噪声引起。基于小波分析和傅里叶变换实现了陀螺中正弦噪声的辨识，并在此基础上，提出了结合小波分析法和Allan方差法计算零偏不稳定性、随机游走和量化噪声的方法，并进行了实际计算验证。

Abstract

Fiber optic gyroscope (FOG) is a typical optical fiber interferometer. The nonreciprocal errors in its output are mainly induced by parasitic interferences and its zero bias error demonstrates a periodical characteristic. The sinusoidal noise induced by the parasitic interferences is found to be the main impact factor of bias error by using the Allan variance analysis method. By adding the sinusoidal noise to the original FOG output, we find that the “rate ramp and rate random walk” sections in the Allan variance curve are due to the sinusoidal noise. The sinusoidal noise identification method is implemented by using wavelet analysis and Fourier analysis. Based on this, the calculation methods for bias instability coefficient, angle random walk coefficient and quantization noise coefficient are proposed with wavelet analysis and Allan variance analysis and validated in experiment.

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杨远洪, 孟晨雪. 光纤陀螺零偏误差特性及噪声分析方法研究[J]. 光学学报, 2014, 34(12): 1206006. Yang Yuanhong, Meng Chenxue. Research on the Characteristic of Bias Error and Noise Analysis Method of Fiber Optic Gyroscope[J]. Acta Optica Sinica, 2014, 34(12): 1206006.

光纤陀螺零偏误差特性及噪声分析方法研究

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