Method for leaky coaxial cable fault diagnosis based on pulse compression

To solve the problem of limitation and low efficiency in traditional leaky coaxial cable (LCX) fault diagno-sis,a method of LCX fault diagnosis based on linear frequency modulation ( LFM) pulse compression technology was proposed. The common faults and fault diagnosis principle of leaky coaxial cable were discussed. The fundamentals of LFM pulse compression technology were described. In addition,the real part and magnitude spectrum of chirp signal and the design of matched filter were also analyzed. Application of LFM pulse compression in leaky coaxial cable fault diagnosis was proposed. The LCX fault diagnosis instance simulation and experimental validation with a conventional method and LFM pulse compression method were carried out. Results show that the main lobe of the echo signal re-ceived is narrower and the peak value is higher by the LFM pulse compression technique,and the signal-to-noise ratio (SNR) is very good. The method of LFM pulse compression can be used to diagnose the fault point of the LCX. It is feasible and effective for fault diagnosis by LFM pulse compression method.