关键词: 无源互调, 故障定位, 参考信号, 校准技术, 参考平面

Abstract:

Passive inter-modulation fault location technology based on the reference signal is researched.The technology has one more reference channel than the traditional passive inter-modulation measurement techniques,to provide a reference signal,to demodulate phase response of the inter-modulation signal,while introducing calibration technology in the measurement port to build the reference plane,Obtained Time domain response relative to the reference plane By the time-frequency conversion and effective troubleshooting.Based on this,the fault location test is simulated to prove the validity of theory,and the phase reference board is designed and fabricated,the experimental results and the actual value showed that:Absolute value of the difference between the actual value and the measured value of two fault location on the cables are ≤ 1m,the actual relative error of approximately 5.1%,2.4%,proves the correctness and feasibility of this approach.The technology will overcome the shortcomings of traditional fault location,adapts to the nasty geographical environment.

Key words: passive inter-modulation, fault location, reference signal, calibration technology, reference plane