Li Yongxiao, Wang Zinan, Yang Yi, Peng Chao, Zhang Zhenrong, Li Zhengbin
Opt Express. 2014 Jan 27;22(2):1608-18. doi: 10.1364/OE.22.001608.
The bias stability and random walk coefficients (RWC) of interferometric fiber-optic gyroscopes (IFOGs) are directly affected by characteristic noises produced by optoelectronics interactions in optic sensors. This paper documents a novel demodulation method for square wave modulated IFOGs, a method capable of suppressing the white noise that results from optical intensity noises and circuit noises as well as shot noises. In addition, this paper provides a statistical analysis of IFOG signals. Through use of orthogonal harmonic demodulation followed by deployment of matched filters to detract the Sagnac phase from the IFOGs, these channels we then processed, using principle component analysis (PCA), to establish optimal independent synchronous quadrature signal channels. Finally a difference procedure was carried out for the outputs. Our results showed that an experimental sample of the proposed IFOG (1982 m coil under uncontrolled room temperature) achieved a real-time output variance improvement in detecting the Earth's rotation rate, which is well matched with theoretical calculations of its Cramèr-Rao bound (CRB).
干涉式光纤陀螺仪（IFOG）的偏置稳定性和随机游走系数（RWC）直接受到光学传感器中光电相互作用产生的特征噪声的影响。本文记录了一种用于方波调制IFOG的新型解调方法，该方法能够抑制由光强度噪声、电路噪声以及散粒噪声产生的白噪声。此外，本文还对IFOG信号进行了统计分析。通过使用正交谐波解调，随后部署匹配滤波器以从IFOG中减去萨尼亚克相位，然后我们使用主成分分析（PCA）对这些通道进行处理，以建立最优独立同步正交信号通道。最后对输出进行差分处理。我们的结果表明，所提出的IFOG的一个实验样本（在不受控室温下1982米的线圈）在检测地球自转速率时实现了实时输出方差的改善，这与它的克拉美 - 罗界（CRB）的理论计算结果非常匹配。
