北京航空航天大学学报 ›› 2010, Vol. 36 ›› Issue (5): 580-583.

• 论文 • 上一篇    下一篇

提高光纤陀螺开机零偏稳定性的调制方法

  

  1. 北京航空航天大学 仪器科学与光电工程学院, 北京 100191)
  • 收稿日期:2009-04-13 出版日期:2010-05-30 发布日期:2010-06-07
  • 基金资助:

    航空科学基金资助项目(2008ZC51030)

Modulation method for stabilizing zero-bias of FOG during warm-up

  • Received:2009-04-13 Online:2010-05-30 Published:2010-06-07

摘要: 针对光纤陀螺在开机启动时零偏不稳定的问题,从机理上分析了2π电压初始对准及前向增益变化对零偏的影响.提出了一种新的组合调制方法,通过4种状态的调制、解调,实现了对Y波导2π电压的快速调整,有效缩短2π电压在陀螺开机时的初始对准时间,由5min缩短至1s,克服了目前方波调制的缺陷.经频域分析和实验验证,该组合调制方法还可以抑制由调制引起的交叉干扰,能够有效抑制前向增益变化对陀螺零偏的影响,从而使前向增益变化导致的陀螺开机零偏变化由0.03(°)/h减小至0.01(°)/h.

Abstract: 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.

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