基于暂态过程优化的谐振式光纤陀螺背向散射噪声抑制方法研究

Research on A Method for Suppressing Backscatter Noise in A Resonant Fiber Optic Gyro Based on Transient Process Optimization

摘要:

针对谐振式光纤陀螺受背向散射噪声影响严重的问题,在优化三角波调制解调参数的基础上,提出了一种基于暂态过程优化的噪声抑制方法。该方法通过部分采样和均值滤波,在不改变陀螺光、电硬件配置的前提下,优化了三角波调制时存在的暂态过程现象,提高背向散射噪声的抑制比,改善解调曲线工作区的线性度。搭建样机并进行实验后,结果表明,基于暂态过程优化的噪声抑制方法能将暂态过程的占空比由64.3%降低至12.1%,解调后背向散射噪声的抑制比达到46.8%,且解调曲线工作区线性度达99.6%。可见,基于暂态过程优化的方法能有效提高谐振式光纤陀螺背向散射噪声的抑制能力,并改善解调曲线工作区的线性度。

Abstract:

A method for suppressing backscatter noise based on transient process optimization is proposed. This method optimizes the parameters of triangular wave modulation and demodulation to address the serious effect of backscatter noise on a resonant fiber optic gyro (RFOG). The method optimizes the phenomenon of the transient process present in triangular wave modulation by partial sampling and mean filtering to improve the rejection ratio of backscatter noise and the linearity of the workspace of the demodulation curve without changing the optical and electrical hardware of the gyro. The results of experiments conducted with a prototype showed that the noise suppression method based on transient process optimization could reduce the duty cycle of the transient process from 64.3% to 12.1%, and the suppression ratio of backscatter noise reached 46.8%. At the same time, the workspace of the demodulation curve had a linearity of 99.6%. The method based on transient process optimization efficiently improved the suppression of backscatter noise in an RFOG, along with the linearity of the workspace of the demodulation curve.