一种光纤陀螺仪的萨格奈克相移跟踪方法

Sagnac phase shift tracing method of optical fiber gyroscope

Abstract

The invention discloses a Sagnac phase shift tracing method of an optical fiber gyroscope, belonging to the field of optical fiber sensors. The method comprises the following steps: 1) carrying out filter demodulation on the detected signal when K equals to zero to obtain first and second harmonic demodulation signals S1(0) and S2(0) when K equals to zero; 2) calculating the Sagnac phase shift (0) of the optical fiber gyroscope when k equals to zero based on the S1(0) and S2(0), and initializing the initial value of a phase offset parameter PB to zero; and 3) carrying out filter demodulation on the detected signals collected at a later K moment to obtain first and second harmonic demodulation signals S1(k) and S2(k) at the present moment; and based on S1(k), S2(k), a first harmonic demodulation signal S1(k-1) and a second harmonic demodulation signal S2(k-1) at the previous moment, determining a Sagnac phase shift (k) value at the present moment. The invention can greatly improve the dynamic range, precision and scale factor linearity of the high optical fiber gyroscope.
本发明公开了一种光纤陀螺仪的萨格奈克相移跟踪方法,属于光纤传感领域。本方法为:1)对k=0时刻采集的探测信号进行滤波解调,得到k=0时刻探测信号的一、二次谐波解调信号S1(0)和S2(0);2)根据S1(0)、S2(0)计算得到k=0时刻光纤陀螺的萨格奈克相移(0),并初始化一相位偏置参数PB的初始值为0;3)对后续k时刻采集的探测信号进行滤波解调,得到当前时刻的一、二次谐波解调信号S1(k)和S2(k);并根据S1(k)、S2(k)以及前一时刻的一次谐波解调信号S1(k-1)、二次谐波解调信号S2(k-1),确定当前时刻的萨格奈克相移(k)值。本发明能够大大提高光纤陀螺的动态范围、精度和比例因子线性度。

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