采用3×3耦合器构成非互易结构的开环光纤陀螺,具有灵敏度高、测量范围大等优点。信号检测在光纤陀螺系统中占有非常重要的地位,其解调精度的大小直接影响光纤陀螺的分辨率。根据使用3×3耦合器的开环光纤陀螺输出信号模型的特点,采用一种新的信号解调算法,可以准确解调任意动态范围的输入,克服在工作点附近灵敏度低的缺点,改善被测信号的精度。实验结果表明,算法能快速、准确解调被测物理量。 The use of 3 × 3 coupler to form a non-reciprocal structure of open-loop fiber optic gyroscope, with high sensitivity, large measuring range and so on. Signal detection occupies a very important position in the fiber optic gyroscope system, and its demodulation accuracy directly affects the resolution of the fiber optic gyroscope. According to the characteristics of the open-loop FOG output signal model using a 3 × 3 coupler, a new signal demodulation algorithm can be used to accurately demodulate the input of any dynamic range to overcome the shortcomings of low sensitivity in the vicinity of the working point and improve Measure the accuracy of the signal. Experimental results show that the algorithm can quickly and accurately demodulate the measured physical quantities.