谐振腔光纤陀螺 (R FOG)是利用光学Sagnac效应实现对转动检测的一种高精度的惯性传感器件。在谐振腔光纤陀螺系统中 ,信号检测系统占有非常重要的地位 ,其检测精度的大小直接影响陀螺的分辨率。光纤环形谐振腔是谐振腔光纤陀螺的核心敏感部件。采用两种频率的锯齿波组合调制 ,考虑激光器有限光谱线宽条件下 ,采用洛仑兹线型描写光纤环形谐振腔的输出光强表达式。针对输出光强与谐振频率偏差在靠近谐振点附近的近似线性关系 ,利用多次反馈频率操作来依次跟踪谐振腔光纤陀螺顺时针和逆时针光束的谐振点 ,从而避免了谐振频率偏差复杂的求根算法。仿真结果表明 ,多次反馈频率操作 ,可以较快地锁定到谐振点 Resonator fiber optic gyro (R FOG) is the use of optical Sagnac effect on the rotation detection of a high-precision inertial sensor. In the resonator fiber optic gyro system, the signal detection system occupies a very important position, the size of its detection accuracy directly affects the resolution of the gyro. Fiber ring resonators are the core sensitive components of fiber optic gyroscopes. The combination of sawtooth wave modulation with two frequencies is adopted. The output light intensity expression of Lorentz-type fiber ring resonator is considered under the condition of finite spectral linewidth of the laser. Aiming at the approximate linear relationship between the output light intensity and the deviation of resonance frequency near the resonance point, the resonance points of the CW and CW light beams of the FOG are sequentially tracked by the operation of multiple feedback frequencies to avoid the complicated resonance frequency deviation Root algorithm. Simulation results show that multiple feedback frequency operation can lock to the resonance point faster