【摘要】：目前常用的周界入侵檢測(cè)系統(tǒng)雖然能夠?qū)θ肭终哌M(jìn)行檢測(cè),但系統(tǒng)存在受環(huán)境影響較大、漏檢率和誤檢率高等一系列問題,近幾年發(fā)展起來的基于泄漏電纜的周界入侵檢測(cè)系統(tǒng)很好地解決了上述問題。然而,上述各種周界入侵檢測(cè)系統(tǒng)普遍存在的問題是無法對(duì)入侵者進(jìn)行精確定位。針對(duì)以上周界入侵檢測(cè)系統(tǒng)存在的問題,本文設(shè)計(jì)了泄漏電纜導(dǎo)波雷達(dá)周界入侵檢測(cè)系統(tǒng)用于對(duì)入侵者進(jìn)行精確定位。一旦精確定位,工作人員可在最短的時(shí)間內(nèi)到達(dá)入侵發(fā)生處,目標(biāo)針對(duì)性強(qiáng),可迅速排除安全隱患,同時(shí)該系統(tǒng)的成功研制將填補(bǔ)國(guó)內(nèi)無法對(duì)入侵者進(jìn)行精確定位的空白。信號(hào)在泄漏電纜中傳播時(shí)向外耦合信號(hào),在電纜周圍形成圓柱狀表面波并形成穩(wěn)定的電磁場(chǎng),當(dāng)有入侵發(fā)生時(shí),穩(wěn)定電磁場(chǎng)受到擾動(dòng),部分信號(hào)發(fā)生反射并耦合進(jìn)入接收電纜傳送至系統(tǒng)接收端,精確計(jì)算出信號(hào)從發(fā)射至被接收回來所用的延時(shí)時(shí)間?t即可對(duì)入侵者進(jìn)行精確定位。通過理論分析和仿真實(shí)驗(yàn)可知,運(yùn)用互相關(guān)算法可將入侵發(fā)生定位到某一碼元內(nèi),實(shí)現(xiàn)對(duì)入侵者的粗定位,在此基礎(chǔ)上,對(duì)硬件系統(tǒng)和軟件部分進(jìn)行了設(shè)計(jì),硬件設(shè)計(jì)主要包括系統(tǒng)主控、發(fā)射機(jī)以及接收機(jī)三個(gè)部分,軟件部分包括程序總流程控制以及相關(guān)模塊的程序設(shè)計(jì),結(jié)合脈沖延遲測(cè)距技術(shù)、二相編碼技術(shù)以及游標(biāo)測(cè)距原理實(shí)現(xiàn)對(duì)入侵者的精定位,最終將入侵發(fā)生定位到某一碼元的某一載波周期內(nèi),實(shí)現(xiàn)精確定位。將硬件系統(tǒng)置于文中所述的四種情況下進(jìn)行現(xiàn)場(chǎng)測(cè)試,對(duì)實(shí)驗(yàn)數(shù)據(jù)進(jìn)行分析和計(jì)算,結(jié)果表明:系統(tǒng)可實(shí)現(xiàn)對(duì)入侵者的精確定位,系統(tǒng)探測(cè)概率、誤報(bào)率、漏報(bào)率以及定位精度與是否有干擾及入侵防護(hù)區(qū)域目標(biāo)個(gè)數(shù)有關(guān),單目標(biāo)入侵無干擾時(shí),系統(tǒng)工作性能表現(xiàn)最佳,定位精度為3.81m,大于理論值(3m)僅0.81m;多目標(biāo)入侵有干擾時(shí),系統(tǒng)性能指標(biāo)最差,定位精度為4.65m大于理論值1.65m;絕對(duì)誤差隨電纜長(zhǎng)度增加而增大,相對(duì)誤差隨電纜長(zhǎng)度增加而減小,且系統(tǒng)對(duì)小動(dòng)物并不敏感。
[Abstract]:Although the commonly used perimeter intrusion detection system can detect intruders at present, the system has a series of problems, such as high rate of missed detection and high rate of false detection, which are greatly affected by the environment. The perimeter intrusion detection system based on leakage cable developed in recent years has solved the above problems well. However, the common problem of all kinds of perimeter intrusion detection systems is that they can not locate intruders accurately. In order to solve the problems existing in the above-mentioned perimeter intrusion detection system, a leakage cable guided wave radar perimeter intrusion detection system is designed for accurate location of intruders. Once the location is accurate, the staff can reach the invasion place in the shortest time, the target is strong, and the hidden danger of security can be eliminated quickly. At the same time, the successful development of the system will fill the blank that the intruder can not be accurately located in our country. When the signal propagates in the leakage cable, the signal is coupled outward, forming a cylindrical surface wave around the cable and forming a stable electromagnetic field. When there is an invasion, the stable electromagnetic field is disturbed. Part of the signal is reflected and coupled into the receiving cable to be transmitted to the receiving end of the system, and the delay time of the signal from transmitting to being received can be accurately calculated? t can accurately locate the intruder. Through theoretical analysis and simulation experiments, it can be seen that the intrusion can be located within a certain symbol by cross-correlation algorithm, and the coarse location of intruders can be realized. On this basis, the hardware system and software part are designed. The hardware design mainly includes the main control of the system, the transmitter and the receiver. The software part includes the general flow control of the program and the program design of the related modules, combining with the pulse delay ranging technology. The two-phase coding technique and the Vernier ranging principle realize the precise location of intruders, and finally locate the intruders to a certain carrier period of a symbol to achieve accurate positioning. The hardware system is put into the four cases described in this paper for field testing, and the experimental data are analyzed and calculated. The results show that the system can realize the accurate location of intruders, the detection probability of the system, the false alarm rate, and so on. The missing alarm rate and positioning accuracy are related to whether there is interference or not and the number of targets in the intrusion prevention area. When the single target invades without interference, the performance of the system is the best, the positioning accuracy is 3.81m, which is only 0.81m higher than the theoretical value (3m). When the multi-target intrusion is interfered, the system performance index is the worst, and the positioning accuracy is 4.65m higher than the theoretical value 1.65m. The absolute error increases with the increase of cable length, while the relative error decreases with the increase of cable length, and the system is not sensitive to small animals.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN957.51

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