频率调制在谐振腔光纤陀螺中的应用

对被动式谐振腔光纤陀螺进行双光路频率调制是降低瑞利背向散射最简便、效果最好的方法，且可以提高系统精度，改善开、闭环控制效果。文中简述了对陀螺信号进行调制的两种基本方法，即对谐振腔体进行调制和对入射光频率进行调制，得出后者在性能上的优势。采用洛仑兹公式描述光纤陀螺的传递函数，结合输入信号特征，建立其频域的数学模型，并给出了计算结果和相关图形，以及一些关键参数的优化值，且对全光路的结构提出了具体的配置

Application of Frequency Modulation in Resonator Fiber Optic Gyro

For passive resonator fiber optic gyro, the dual path frequency modulation is the most effective and easy way to reduce Rayleigh back scattering induced error, and is the necessary measure to increase the system's precision and to improve the open loop and close loop controlling efficiency. First, two methods of signal modulation, including cavity length modulation and frequency modulation, were discussed. The advantages of the latter can be seen compared with the former in their characteristics. Second, Lorentzent formula was used to approximate the resonator's transfer function, so its mathematical model in frequency field can be built according to the feature of the input signal. The result and related diagrammatic curves, as well as some optimized necessary parameters were given. Finally, a particular operation system scheme was suggested.