Bispectrum Applied in the Leakage Detection of Urban Underground Gas Pipeline
Baoguang Wang · New Technology & New Process · 2008
Due to low pressure,complex circumstance noise and weak leakage signal of the urban underground gas pipeline,it is difficult to detect the signal through general signal processing method which is based on the second-order statistics.This paper applies bispectrum that can suppress Colored Gaussian noise and retain signal phase,to the leakage detection of low pressure pipe- line.According to the national standard,a 40-meter-long test system is established.Direct method is used to estimate the bis- pectrum and the corresponding criterion is presented.Experiment results show that this method is availability in leakage detection for the middle-low pressure pipeline.