相位光时域反射仪中信号处理方法的研究

Research on signal processing method of phase optical time domain

为提高相位光时域反射仪对扰动判断的准确性,研究了两种常用于对其后向散射信号处理的方法。实验结果表明,单一的叠加平均方法在一定程度上能抑制噪声,但耗费时间长,不利于系统的实时性,并且对扰动信息的提取不明显。小波阈值滤波的方法能比较有效地降噪并识别出扰动信息,但需要找到合适的小波基及其分解层次。在实际应用中通过采用多种小波基共同作用的综合判断法,可以减少系统的误判、漏判,提高系统的准确性。

In order to improve the accuracy of disturbance judgment in phase optical time domain reflector,two kinds of methods for dealing with the scattering signal are studied. The results show that the ensemble averaging method can suppress the noise in a certain extent,but it takes a long time and is not conducive to the real- time performance of the system,and the extraction of the disturbance information is not obvious. Wavelet threshold filtering method can effectively reduce the noise and identify the disturbance information,but it need to find a suitable wavelet basis and its decomposition level. In the practical application,we can reduce the errors and improve the accuracy by using the comprehensive judgment method.