一种光纤安防系统入侵定位及特征识别研究

发布时间：2018-06-15 09:18

本文选题：入侵定位 + TDC　；参考：《安徽理工大学》2017年硕士论文

【摘要】：目前光纤安防系统在技术上取得了很大的进步,但仍然存在一些问题,比如现有光纤周界安防系统的定位精度达不到某些重要部门的要求,不能对入侵事件的特征进行准确的分析,从而导致误报率非常高。针对目前光纤周界安防系统中存在的缺点,为了提高系统的定位精度,降低入侵特征的误判率。设计了一款基于把入侵定位信号和入侵特征信号的获取来源分开的一种区域周界光纤安防系统,取代原来的入侵定位信号和特征识别信号混合在一起的采集方案。本研究采用的是利用时间数字转换技术(TDC)来对入侵地点进行定位,取代目前常用的通过解调干涉信号的相位差进行定位的方案。由于现有的时间数字转换技术可以实现对超短时差进行测量,其分辨率能够达到皮秒级,非常适合应用在光纤安防定位方面,进行精确定位和连续测距。由于光纤安防系统的入侵信号中不可避免的包含很多干扰信号,为了提高识别入侵特征信号的性能,降低系统的误判率,本研究采用了基于入侵特征信号的数据库查询对比技术。本研究设计了以TDC获得入侵时间差做为信号采集单元、以DSP2812芯片为控制板核心的入侵定位设计方案。完成了 TDC与DSP的通信模块的结构和程序方案设计,DSP与上位机的通信模块设计;应用LabVIEW工具用来存储入侵信号以及进行信号特征量对比。通过搭建的实验平台,进行了基于TDC的入侵定位和上位机监控的联合实验调试,实验结果验证了系统的定位精度达到了预期设计目标;基于LabVIEW的监控界面显示了入侵位置和时间信息并报警。采用模拟入侵信号,设计的基于LabVIEW和数据库比对查询来实现特征量识别的系统,仿真实验结果证实了该设计是可行的。
[Abstract]:At present, great progress has been made in the technology of optical fiber security system, but there are still some problems. For example, the positioning accuracy of the existing optical fiber perimeter security system does not meet the requirements of some important departments. The characteristics of intrusion events can not be accurately analyzed, resulting in a very high false alarm rate. In order to improve the positioning accuracy of the optical fiber perimeter security system and reduce the error rate of the intrusion features, the shortcomings of the current optical fiber perimeter security system are discussed in order to improve the positioning accuracy of the system. Based on the separation of the source of intrusion location signal and intrusion characteristic signal, a zone perimeter optical fiber security system is designed to replace the original intrusion location signal and feature recognition signal. In this study, the time digital conversion (TDC) technique is used to locate the intrusion site, replacing the commonly used scheme of demodulating the phase difference of interference signal. Because the existing time-digital conversion technology can measure ultrashort time difference, and its resolution can reach picosecond level, it is very suitable for accurate location and continuous ranging in optical fiber security positioning. Because the intrusion signal of optical fiber security system inevitably contains a lot of interference signals, in order to improve the performance of identifying intrusion characteristic signal and reduce the misjudgment rate of the system, This research adopts the database query contrast technology based on intrusion feature signal. In this paper, an intrusion location scheme is designed, which takes TDC intrusion time difference as signal acquisition unit and DSP2812 chip as the core of control board. Structure and Program Design of Communication Module between TDC and DSP the communication module between DSP and host computer is designed, and LabVIEW is used to store the intrusion signal and compare the characteristic quantity of the signal. Through the experimental platform, the intrusion location based on TDC and the monitoring of the host computer are debugged. The experimental results verify that the positioning accuracy of the system has reached the desired design goal. The monitoring interface based on LabVIEW shows the intrusion location and time information and alarm. The system of feature recognition based on LabVIEW and database comparison query is designed by using simulated intrusion signal. The simulation results show that the design is feasible.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP212;TP277

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