光纤陀螺分形噪声的预白化滤波方法

华春红; 任章; 张敏虎

光纤陀螺分形噪声的预白化滤波方法

北京航空航天大学自动化科学与电气工程学院, 北京 100191

基金项目: 航空科学基金资助项目(20070851011)

详细信息

作者简介:
华春红(1976-),女,江西崇仁人,博士生,huachh@asee.buaa.edu.cn.

中图分类号: V 241.5
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- 被引次数: 0
出版历程
- 收稿日期: 2009-12-24
- 网络出版日期: 2011-02-28

Pre-whitening filter of fractal noise in fiber optic gyroscope

School of Automation Science and Electrical Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

摘要

摘要: 光纤陀螺分形噪声往往具有长相关特性,导致陀螺输出信号慢漂移.为了滤除这类分形噪声,提出了一种分数阶预白化差分方法,通过该方法可以将分形噪声转化为高斯白噪声;利用小波变换,在小波变换域中采用Bayes软阈值去噪方法去除该白化噪声,从而形成了一种光纤陀螺分形噪声的预白化滤波方法.对VG949p型光纤陀螺实测数据处理结果表明,该方法能够有效地去除其中的分形噪声,抑制了陀螺低频漂移,同时也滤掉了其高频噪声项.
- 光纤陀螺 /
- 随机误差 /
- 差分方程 /
- 小波分析
Abstract: Fractal noise in fiber optic gyroscope (FOG) usually is long-term dependent, which causes FOG a rather slow drift. In order to filter this noise, a pre-whitening filter based on fractional difference (FD) was proposed. By this filter, fractal noise could be transformed into Gaussian white noise (GWN). And through wavelet analysis, the pre-whitening noise could be eliminated by Bayes soft-threshold denoising in wavelet domain. On the two aforementioned steps, it came into a pre-whitening filter method of fractal noise. After the test data processing of FOG-VG949p, the results show that its fractal noise was removed efficiently, so the slow drift is restrained. The high frequency noise terms of FOG also greatly decrease.
- fiber optic gyroscope (FOG) /
- random errors /
- difference equations /
- wavelet analysis

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