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�������պ����ѧѧ�� 2010, Vol. 36 Issue (5) :580-583    DOI:
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Modulation method for stabilizing zero-bias of FOG during warm-up

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To solve the zero-bias fluctuation problem of fiber-optic gyroscope (FOG) during its warm-up, the influences of initial alignment of 2π voltage and anterior gain fluctuation on the zero��bias of FOG were analyzed, respectively. A novel hybrid modulation method, namely four-state modulation method was proposed, by which the drawback of conventional square wave modulation method can be overcome. Due to this proposed four��state modulation and demodulation method, the rapid adjustment of Y waveguide 2π voltage was realized, which reduces the adjusting time of the warm-up from 5 minutes to 1 second. Owing to the analysis in the frequency domain, it was presented that the proposed four-state modulation and demodulation method can also suppress the crosstalk induced by modulation and suppress the influence of the anterior gain on the zero��bias fluctuation. As a result, the change of the anterior gain fluctuation induced zero-bias of FOG during warm��up is improved from 0.03(°)/h to 0.01(°)/h.

Keywords�� fiber optic gyroscope (FOG)   modulation   crosstalk   waveguides     
Received 2009-04-13;


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Xu Wenyuan��Zhang Chunxi��Wu Zhanjun��Zhang Xi��.Modulation method for stabilizing zero-bias of FOG during warm-up[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2010,V36(5): 580-583
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