基于Φ-OTDR的列车行驶轨迹检测方法

Trains Track Detection Method Based on Φ-OTDR

提出一种基于相位敏感光纤传感技术(Φ-OTDR)的列车行驶轨迹检测方法。该方法采用(Φ-OTDR)采集列车行驶中的振动信息,对紧邻的两个不同时刻的信号进行差值计算,并采用阈值和基于小波变换的低通滤波处理,对处理后的差值信号进行幅值特征提取,根据幅值特征来区分有用信号和外界干扰信号,最后根据识别出的有用信号来确定列车当前位置、速度和行驶方向等信息。该方法仅使用现有的轨旁光缆,无需额外的施工工作量,具有维护成本低、抗干扰能力强,可实现大范围分布式检测等诸多优点,可为当前列车行驶提供一种可靠的辅助判断手段,对于列车安全行驶具有重要的潜在应用价值。

This paper presents a trains track detection based on phase sensitive optical fiber sensing technology （Φ-OT- DR）.The method uses Φ-OTDR to acquire the vibration information of running trains,calculate the difference between two close different time signal,and uses the threshold processing and low-pass filtering treatment based on wavelet transform, extract the amplitude feature and distinguish the useful signal and interference signal according to the amplitude feature,ac- cording to the identification of useful signal to determine trains current position,speed and driving direction.