本文首先通过正弦波调制下干涉信号光强分析解调出光纤陀螺的输出信号,进而得出残余强度调制存在的情况下陀螺输出信号的变化情况,同时,通过分析陀螺信号的变化说明残余强度调制对光纤陀螺性能的影响与陀螺精度要求有关,精度越高,其影响越明显。其次,具体分析了数字闭环光纤陀螺受残余强度调制影响的情况下,其解调输出电压变化引起的数字阶梯高度变化,并通过残余强度调制系数与数字阶梯高度的关系式,说明了残余强度调制对光纤陀螺零偏和标度因数的影响。最后,对所得出的残余强度调制系数与光纤陀螺标度因数稳定性的关系进行了Matlab 仿真,通过仿真结果,更进一步说明残余强度调制对数字闭环光纤陀螺标度因数稳定性的影响。

Through the interferencing light intensity under a sine-wave modulation signal analysis, the output signal of fiber-optic gyroscope is demodulated. And then the change of the output signal of gyro is gotten. Through the analysis of the change we know that the effect of residuary intensity modulation on the performance of Interferometric Fiber Optic Gyroscope (IFOG) is related with the precision and accuracy requirements of IFOG. The higher precision, the more obvious effect. Secondly, we analyze the digital ladder height change caused by the demodulation output voltage change in the condition of the effect of residuary intensity modulation on the digital closed-loop fiber-optic gyro. Moreover, through the residuary intensity modulation coefficient and digital ladder height formula, explain the influence of residuary intensity modulation on the fiber-optic gyro zero bias and scale factor. Finally, we simulate the relationship of the residuary intensity modulation coefficient and the scale factor stability of fiber-optic gyro by using the Matlab simulation tool. The simulation results further explain the effect of residuary intensity modulation on digital closed-loop fiber-optic gyro scale factor stability.