Pre-estimate Relative Intensity Noise subtraction performance of FOG by using signal cross-correlation

Yonggang Zhang, Honggang Chen, Tao Li, Deshuang Wang
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引用次数: 2

Abstract

A method of pre-estimate Relative Intensity Noise (RIN) subtraction performance in Interference Fiber Optic Gyroscope (IFOG) is introduced. Experiment shows that the noise subtraction result depends on the cross-correlation coefficient between FOG's output and coupler's free port signal. The variance of the noise would rise when cross-correlation coefficient is lower then 0.5 and reduce to 17.16% with crosscorrelation coefficient 0.91. Estimating the cross-correlation coefficient before noise subtraction can avoid the situation that the noise increase after noise subtraction, and finally enhance the reliability of noise subtraction.
利用信号互相关预估光纤陀螺的相对强度减噪性能
介绍了干涉光纤陀螺仪(IFOG)中相对强度噪声(RIN)减法性能的预估方法。实验表明,减噪结果取决于光纤陀螺输出与耦合器自由端口信号之间的互相关系数。当相关系数小于0.5时,噪声方差增大;当相关系数为0.91时,噪声方差减小到17.16%。在降噪前估计相关系数,可以避免降噪后噪声增大的情况,最终提高降噪的可靠性。
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