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Pre-whitening filter of fractal noise in fiber optic gyroscope
Hua Chunhong, Ren Zhang, Zhang Minhu*
School of Automation Science and Electrical Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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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.
Keywords�� fiber optic gyroscope (FOG)   random errors   difference equations   wavelet analysis     
Received 2009-12-24;
Fund:

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About author: ������(1976-),Ů,����������,��ʿ��,huachh@asee.buaa.edu.cn.
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������, ����, ������.�������ݷ���������Ԥ�׻��˲�����[J]  �������պ����ѧѧ��, 2011,V37(2): 216-219
Hua Chunhong, Ren Zhang, Zhang Minhu.Pre-whitening filter of fractal noise in fiber optic gyroscope[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2011,V37(2): 216-219
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