本文介绍了一种计算由偶次谐波引起光纤陀螺零偏误差仿真方法,根据计算光纤陀螺的零偏误差可以用贝塞耳函数和三角函数表示。在计算中我们发现光纤陀螺的零偏误差与调制信号中的偶次谐波和光纤中由于偏振现象引起的角度误差有关。当调制深度设置到3π/5附近时,零偏误差可以减少到最小。由于制信号中的偶次谐波是引起零偏误差的主要原因,我们使用频谱分析仪测量了调制信号中的偶次谐波。此外,我们还通过光纤陀螺的输出测量了光纤陀螺的零偏误差。通过仿真得到的光纤陀螺零偏误差结果得到了试验的验证。

We demonstrate a simulation method to estimate the bias error in fiber optic gyroscope caused by the even order distortion.The bias error can be expressed by the Bessel functions and trigonometric identities.Corresponding to theoretical simulation,the bias error varies dependence on the even order distortion crosstalk and birefringence phase angle.The bias error can be minimized by choosing the modulation depth around 3π./5 The even order distortion is measured by using the spectrum analyzer since the even order distortion is a main factor in the causing bias error.Moreover,the bias error is measured through the output of fiber optic gyroscope.The experiment data of the bias error is fit well with the simulation result.