光纤陀螺基于SNR检测的EMD滤波方法

Filtering Method with EMD Based on SNR Testing in FOG

光纤陀螺的输出信号是一种非线性、非平稳的随机信号。针对光纤陀螺信号的特点采用经验模分解(EMD)滤波法对陀螺输出信号进行滤波存在一个如何重构信号的问题,为此提出了基于信噪比检测的EMD滤波法。该方法通过连续检测相邻两个重构信号信噪比提高的程度来确定滤波后的输出信号。实验结果表明,该法能有效消除光纤陀螺信号中的噪声,并为EMD滤波法重构信号提供了一个客观的判断方法,且无需任何先验知识。

Abstract.. The output signal of fiber-optic gyroscope （FOG） is a kind of nonlinear, nonstationary random signal. How to reconfigurate the signal is a problem for the output signal being filtered with empirical mode decomposition （EMD） filtering method, therefore the filtering method with EMD based on SNR testing is proposed in this paper. The filtered output signal is determined by testing continuously the enhanced grade of SNR between the two adjacent reconfiguration signal. The experimental results shows that this method can efficiently eliminate the noise in the output signal of FOG, and is an objective judgment means for the reconfigurating signal of EMD filtering method without any prior knowledge about noise in FOG.