线性调频脉冲压缩在漏缆故障定位中的应用研究

摘要

为了增强通信漏缆故障定位中的信号强度及故障定位精度,研究线性调频脉冲压缩技术在通信漏缆故障定位中的应用.介绍线性调频脉冲压缩技术的基本原理及线性调频信号的频谱特性,以及其匹配滤波器和窗函数的设计与实现,分析脉冲压缩参数对回波信号的影响,构建通信漏缆故障定位检测系统,对GSM-R型漏缆进行检测试验.试验结果表明,相对于常规脉冲检测方式,线性调频脉冲压缩检测可提高同轴漏缆故障检测精度,载频频率与GSM-R工作频率相接近时效果最佳.在高铁隧道泄漏电缆故障现场检测中,漏缆故障检测效果得到了明显改善.%In order to enhance the signal intensity and fault location precision in positioning of leaky coaxial cable fault, the linear frequency modulation pulse compression technology applied in positioning of communication leaky coaxial cable fault is proposed in this paper. The basic principle of linear frequency modulation pulse compression technology and the spectrum characteristics of linear frequency modulation signals are introduced,the design and implementation of the matched filter and window function are described,and the effect of pulse compression parameters on echo signals are analyzed to construct the com-munication leaky coaxial cable fault location detection system for testing GSM-R leaky coaxial cables. The experimental results show that the method of the linear frequency modulation pulse compression can improve the detection accuracy of leaky coaxial cable fault compared to the conventional pulse detection method,the effect reaches best when the carrier frequency is close to the operating frequency of GSM-R,and the leaky coaxial cable fault detection effect is obviously improved at the scene of high-speed railway tunnel leaky coaxial cable fault detection.