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对光纤陀螺中光相位差的检测是得到所需角速度的基础。简要分析了陀螺输出信号的特点 :噪声大、非线性、周期性 ,以及这些特点对检测有效信号的影响。提出了一种单通道光相位差跟踪的方法。这种方法采用正弦调制 ,通过对信号 (包括输出信号和跟踪信号 )的三角和乘法运算 ,并在必要的环节进行滤波得到光相位差。它能够解决光纤陀螺动态范围和刻度因子线性度问题 ,并具有简明、成本低、易实现的特点。最后进行了相位跟踪的计算机模拟和电路的实现 ,并给出了实验结果
The detection of optical retardation in FOGs is the basis for obtaining the required angular velocity. The characteristics of the gyro output signal are briefly analyzed: large noise, non-linearity, periodicity, and the influence of these characteristics on the detection of valid signals. A single channel optical phase difference tracking method is proposed. This method uses sinusoidal modulation, through the signal (including the output signal and the tracking signal) of the triangular and multiplication, and the necessary part of the filter to get the optical phase difference. It can solve the linearity problem of FOG dynamic range and scale factor, and has the characteristics of conciseness, low cost and easy implementation. Finally, the phase tracking computer simulation and circuit implementation, and gives the experimental results