Stability improvement enabled by four-state modulation in dual-polarization fiber optic gyroscopes

Stability improvement enabled by four-state modulation in dual-polarization fiber optic gyroscopes
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双偏振光纤陀螺仪中的四态调制提高了稳定性

DOI:
10.1016/j.optcom.2019.07.013
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发表时间:
2019-12
影响因子:
2.4
通讯作者:
Li Zhengbin
Li Zhengbin
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
He Dong;Wu Yangjun;Li Yulin;Zhang Zhenrong;Peng Chao;Li Zhengbin

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为了提高双偏振光纤陀螺仪(IFOG)在开环状态下的稳定性,克服了闭环状态下的死区问题,并获得了比传统正弦调制更好的信噪比(SNR),提出了一种四态调制方案。我们从理论上和实验上证明,由于双偏振IFOG中共存的两个正交光偏振之间的交叉耦合,在方波调制下旋转速率不是严格可解的。相反,即使交叉耦合强度随时间变化,四态调制也能准确地提取旋转速率。改进的角度随机漫步(ARW)为2。2× 10−4°∕h,偏置不稳定性(BI)为3。5× 10−4°∕h的测量结果,验证了所提出方法的有效性。
A four-state modulation scheme is proposed to improve the stability performance of a dual-polarization fiber optic gyroscope (IFOG) operating under an open-loop configuration, overcoming the dead-zone issue that occurs in a closed-loop configuration and achieving a better signal-to-noise ratio (SNR) than conventional sinusoidal modulation. We prove theoretically and demonstrate experimentally that owing to the cross-coupling between the two orthogonal light polarizations co-existing in the dual-polarization IFOG, the rotation rate is not rigorously solvable under square-wave modulation. Instead, four-state modulation accurately extracts the rotation rate, even when the cross-coupling strength varies in time. An improved angular random walk (ARW) of 2. 2× 1 0− 4∘∕ h and bias instability (BI) of 3. 5× 1 0− 4∘∕ h were achieved in detecting the rotation rate of the Earth, verifying the effectiveness of the proposed method.
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期刊: Sensors (Basel, Switzerland)
影响因子: --
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