为了实现对信号和噪声的有效分离, 从而对光缆线路中的故障点进行准确定位, 避免对故障点的漏判/误判, 改善故障的定位精度, 文章提出一种对通信光缆线路中的故障点进行定位和检测的方法, 基于小波变换模极大值监测信号奇异点的理论, 并结合阈值去噪法来对OTDR(光时域反射仪)测试曲线进行去噪。结果表明, 该方法能对OTDR测试曲线进行有效去噪, 更准确地确定光缆故障点的位置。

In order to effectively separate signal from noise so as to accurately locate the fault points in optical cable lines, avoid missing or misjudging the point of failure and improve the positioning accuracy, this paper presents a method for locating and detecting the fault points in communication cable lines. In this method, it eliminates or decreases the noise in Optical Time Domain Reflectometer (OTDR) testing curve by using the theory of supervising the signal singularity with Wavelet Transform Modulus Maxima (WTMM) in connection with the Threshold De-noising Method (TDM). The results show that using the proposed de-noising method, it is possible to effectively de-noise OTDR test curve and more accurately locate the fault points in cable lines.