發(fā)布時(shí)間：2018-06-15 09:18

  本文選題：入侵定位 + TDC　； 參考：《安徽理工大學(xué)》2017年碩士論文

【摘要】：目前光纖安防系統(tǒng)在技術(shù)上取得了很大的進(jìn)步,但仍然存在一些問(wèn)題,比如現(xiàn)有光纖周界安防系統(tǒng)的定位精度達(dá)不到某些重要部門(mén)的要求,不能對(duì)入侵事件的特征進(jìn)行準(zhǔn)確的分析,從而導(dǎo)致誤報(bào)率非常高。針對(duì)目前光纖周界安防系統(tǒng)中存在的缺點(diǎn),為了提高系統(tǒng)的定位精度,降低入侵特征的誤判率。設(shè)計(jì)了一款基于把入侵定位信號(hào)和入侵特征信號(hào)的獲取來(lái)源分開(kāi)的一種區(qū)域周界光纖安防系統(tǒng),取代原來(lái)的入侵定位信號(hào)和特征識(shí)別信號(hào)混合在一起的采集方案。本研究采用的是利用時(shí)間數(shù)字轉(zhuǎn)換技術(shù)(TDC)來(lái)對(duì)入侵地點(diǎn)進(jìn)行定位,取代目前常用的通過(guò)解調(diào)干涉信號(hào)的相位差進(jìn)行定位的方案。由于現(xiàn)有的時(shí)間數(shù)字轉(zhuǎn)換技術(shù)可以實(shí)現(xiàn)對(duì)超短時(shí)差進(jìn)行測(cè)量,其分辨率能夠達(dá)到皮秒級(jí),非常適合應(yīng)用在光纖安防定位方面,進(jìn)行精確定位和連續(xù)測(cè)距。由于光纖安防系統(tǒng)的入侵信號(hào)中不可避免的包含很多干擾信號(hào),為了提高識(shí)別入侵特征信號(hào)的性能,降低系統(tǒng)的誤判率,本研究采用了基于入侵特征信號(hào)的數(shù)據(jù)庫(kù)查詢對(duì)比技術(shù)。本研究設(shè)計(jì)了以TDC獲得入侵時(shí)間差做為信號(hào)采集單元、以DSP2812芯片為控制板核心的入侵定位設(shè)計(jì)方案。完成了 TDC與DSP的通信模塊的結(jié)構(gòu)和程序方案設(shè)計(jì),DSP與上位機(jī)的通信模塊設(shè)計(jì);應(yīng)用LabVIEW工具用來(lái)存儲(chǔ)入侵信號(hào)以及進(jìn)行信號(hào)特征量對(duì)比。通過(guò)搭建的實(shí)驗(yàn)平臺(tái),進(jìn)行了基于TDC的入侵定位和上位機(jī)監(jiān)控的聯(lián)合實(shí)驗(yàn)調(diào)試,實(shí)驗(yàn)結(jié)果驗(yàn)證了系統(tǒng)的定位精度達(dá)到了預(yù)期設(shè)計(jì)目標(biāo);基于LabVIEW的監(jiān)控界面顯示了入侵位置和時(shí)間信息并報(bào)警。采用模擬入侵信號(hào),設(shè)計(jì)的基于LabVIEW和數(shù)據(jù)庫(kù)比對(duì)查詢來(lái)實(shí)現(xiàn)特征量識(shí)別的系統(tǒng),仿真實(shí)驗(yàn)結(jié)果證實(shí)了該設(shè)計(jì)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.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TP212;TP277

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本文編號(hào)：2021526