基于宽带准正交的CPPM信号实现电缆网络故障检测

Cable Network Fault Detection Based on the Broadband Quasi-Orthogonal CPPM Signal

电缆网络故障频发会给社会生产与生活造成严重的经济损失和安全隐患,因此需要对电缆网络进行实时监控以确保其正常运行。提出了利用多路宽带准正交的混沌脉冲位置调制信号(Chaotic Pulse Position Modulation,CPPM)结合分布式检测方法进行电缆网络故障检测,通过对构建的Double-Y形网络中的故障进行检测,从而证明该方法的可行性。实验结果表明:该方法不仅能够有效解决单端检测中故障定位模糊的问题,而且能够克服分布式检测中信号相互干扰的问题,准确高效地对电缆网络故障进行定位,并能够进行在线检测,在测量范围达到850m时,相对误差小于2.3%。

Frequent failure of cable network may cause serious economic lost and potential safety hazard in the social production and daily life. Therefore, it＇ s necessary for real-time monitoring in the cable network. A reflectometry- based cable detection method is presented to determine faults position in a multi-branch network by using a distributed diagnosis strategy. The idea is based on the use of wide-band quasi-orthogonal chaotic pulse position modulation （CP- PM） signals for distributed diagnosis. The feasibility of the method is proved by detecting the fault in the built double- Y network. The experimental results show that the proposed method can not only effectively solve the problems of loca- tion ambiguity in single end detection, but also overcome the mutual interference of signals in distributed detection. Thanks to this, the exact position of defects can be detected online in the multi-branch cable network. The maximum range is about 850 m and the relative error of measurement results is less than 2.3%