Phi-OTDR技术信号处理中的特征提取方法

在相位光时域反射(Phi-OTDR)技术分布式振动信号的处理中,为了保证时间轴上的信噪比和长度轴上的作用域同时得到提升,同时兼顾保留信号特征和时域快速处理2个条件,采用了"信噪分类、信号保留、噪声归零"的方式进行信号处理.在信噪分类的过程中,首次提出利用改进的实时编码信号处理算法,在时域上对Phi-OTDR分布式振动信号数据进行时域编码和特征提取.所提方法可以同时提高长度轴上的作用域和时间轴上作用域内各点的信噪比,运算速率也得到了一定的提升.

Feature Extraction Research in Signal Process with Phi-OTDR Technology

In the phase-sensitive optical time domain reflectometer ( Phi-OTDR ) , noise-signal ratio on time axis and effective range on length axis are two important factors. Reservation of signal characteristics and rapid processing in time domain are also two important conditions. To optimize these factors and con-ditions, the signal by signal-noise classification, signal reservation and noise reduction was processed. In signal-noise classification, the time encode signal processing algorithm was improved for coding and ex-tract feature of distributed vibration signal in time domain. The signal range on the length axis and the signal-to-noise ratio of each point on the time axis can be improved. At the same time, the calculation speed is also improved.