Chaotic Ultra-wideband Radar Detection Pipeline Leakage Based On XFDTD Simulation

With the development of the pipeline industry,due to the advantages of low cost,good safety,and stable supply of pipeline transportation,pipeline transportation has been rapidly developed,and its status in people's production and life has become increasingly important.However,with the long-term wear and tear,the natural aging of the equipment,and human damage,pipeline leakage often occurs.At the same time,waste of resources and environmental pollution are caused,and explosions and fires occur,resulting in dangerous accidents such as casualties.Therefore,it is of great practical significance to establish an efficient real-time monitoring and detection system for pipeline leakage,to timely and accurately report the occurrence and exact location of pipeline leakage accidents,and to minimize or even avoid losses and environmental pollution.In recent years,pipeline leakage detection technology has developed rapidly,mainly through the monitoring of pipeline parameters such as pressure,temperature,and flow velocity,or special detection sensors are used in leak detection.At the same time,researchers at home and abroad have carried out research on ground penetrating radar leak detection in pipelines,and have made important progress,becoming a major research hotspot in pipeline leak detection methods.The ground penetrating radar has features such as portable equipment and high distance resolution.To further improve its positioning accuracy,the researchers proposed combining ultra-wideband(UWB)technology with ground penetrating radar to form an ultra-wideband ground penetrating radar.Ultra-wideband ground penetrating radar has strong penetrating power,high resolution,accurate positioning,and low power consumption.However,to ensure a higher range resolution,a narrower pulse width is required,which results in a shallower depth of detection.In order to solve this problem,chaotic ultra-wideband radar enters people's field of vision.In this paper,the chaotic UWB signal is used as the signal source.Through a series of data processing on the echo signal,the leak location of the pipe is finally determined.The main work of the dissertation includes:(1)The research status of pipeline leakage detection technology at home and abroad is reviewed,and some pipeline leakage detection methods are listed.The research progress of current chaotic UWB ground-penetrating radar is described.(2)The chaos phenomenon,the method of determining chaos,the definition of UWB signal,and the experimental principle and experimental device of chaotic generation by the doped fiber ring laser are introduced.The chaotic signal was obtained through experiments,and the performance of the obtained signal was further analyzed.(3)By analyzing the advantages and disadvantages of existing methods for de-noising chaotic signals,a de-noising method combining empirical mode decomposition(EMD)and wavelet thresholds is further proposed.At the same time,the content of empirical mode decomposition,Hilbert spectrum and wavelet thresholds are also performed.And quantitative analysis of proposed noise reduction methods and existing methods are performed.(4)Introduced a finite time domain difference method.Then,a pipeline leakage detection scheme using chaotic radar combined with Hilbert-Huang transform and broadband correlation method is proposed.The oil pipeline leakage model was established by AutoCAD drawing software and XFDTD modeling and simulation software,and the use of software was explained.Finally,the simulation experiment was conducted based on XFDTD software.The data results were processed and analyzed,and the leakage location can be determined simply and conveniently.