基于数模混合对消的远距离泄漏电缆入侵探测系统  

Design of Long-distance Leakage Cable Intrusion Detection System Based on Digital-analog Hybrid Cancellation

作　　者：王华宇 汪楠 凌小峰 WANG Huayu;WANG Nan;LING Xiaofeng(School of Information Science and Engineering,East China University of Science and Technology)

机构地区：[1]华东理工大学信息科学与工程学院

出　　处：《仪表技术与传感器》2024年第10期51-56,63,共7页Instrument Technique and Sensor

基　　金：上海市2021年度“科技创新行动计划”科学仪器领域专项(21142201300)。

摘　　要：针对现有泄漏电缆入侵探测系统存在的单套作用距离短的问题,提出了一种基于数模混合对消的远距离泄漏电缆周界入侵探测系统。使用FPGA作为主控,实现信号发射和采集等功能,并采用LMS算法对收发电缆间直接耦合强信号进行计算,将输出的对消信号与泄漏电缆回波信号在模拟域中对消,扩大入侵信号的接收动态范围,从而提升系统在远距离场景下的探测能力。采用上位机通过UDP获取数据并判断入侵,并设计了基于AD8324的模拟对消板和FPGA收发处理板。实验结果表明:系统在保持良好入侵检测性能的前提下,将泄漏电缆回波信号中的直接耦合强信号幅度降低了12.99 dB,而入侵信号的强度仅损失了0.14 dB,理论上能将单套泄漏电缆的作用距离提升1070 m。In response to the short operating distance problem of existing leakage cable intrusion detection systems,a longdistance leakage cable perimeter intrusion detection system based on digital-analog hybrid cancellation was proposed.The system utilized an FPGA as the main controller to implement functions such as signal transmission and acquisition.The LMS algorithm was employed to calculate the direct coupling strong signals between the transmitting and receiving cables,and the output cancellation signal was combined with the leakage cable echo signal for cancellation in the analog domain.This expanded the dynamic range for receiving intrusion signals and improves the systems detection capability in long-distance scenarios.The host computer acquires data through UDP and detects intrusions,and an analog cancellation board based on AD8324 and FPGA transceiver processing boards were designed.Experimental results demonstrate that,while maintaining good intrusion detection performance,the system reduces the amplitude of the direct-coupled strong signal in the echo signal of the leakage cable by 12.99 dB,while the intensity of the intrusion signal loses only 0.14 dB,and theoretically improving the effective distance of a single set of leaking cables by 1070 m.

关 键 词：泄漏电缆传感器 数模混合对消 远距离入侵探测 FPGA 

分 类 号：TP277[自动化与计算机技术—检测技术与自动化装置]