發(fā)布時(shí)間：2018-03-29 07:04

  本文選題：實(shí)驗(yàn)室　切入點(diǎn)：ZigBee　出處：《沈陽理工大學(xué)》2017年碩士論文

【摘要】：實(shí)驗(yàn)室作為高等院校進(jìn)行教學(xué)和科研的重要場所,存放著種類眾多的精密科研儀器,也有一些易燃、易爆、劇毒等危險(xiǎn)物品,加之使用頻繁,人員集中且流動(dòng)性大,常有突發(fā)性事故發(fā)生,在嚴(yán)重威脅到師生人身安全的同時(shí),還會(huì)給學(xué)校帶來巨大財(cái)產(chǎn)損失。因此如何以較低的投入,保證科研儀器運(yùn)行環(huán)境的安全可靠,確保危險(xiǎn)物品的存放安全,盡可能消除對人身和財(cái)產(chǎn)安全的隱患,已成為社會(huì)關(guān)注的問題。在此背景下,針對高等院校實(shí)驗(yàn)室環(huán)境監(jiān)測需求,本文通過對ZigBee技術(shù)、無線傳感器網(wǎng)絡(luò)技術(shù)、ZigBee抗干擾技術(shù)的研究,設(shè)計(jì)了基于ZigBee的實(shí)驗(yàn)室環(huán)境監(jiān)測系統(tǒng)。另外對相關(guān)干擾技術(shù)進(jìn)行研究,使得系統(tǒng)能夠抵御WiFi干擾,實(shí)現(xiàn)無線傳感器網(wǎng)絡(luò)對溫濕度及紅外數(shù)據(jù)的采集、傳輸和處理,最終達(dá)到對實(shí)驗(yàn)室環(huán)境進(jìn)行監(jiān)測的目的。本文取得的具體成果有以下幾方面:(1)結(jié)合高校對實(shí)驗(yàn)室監(jiān)測系統(tǒng)的需求,本文設(shè)計(jì)了監(jiān)測系統(tǒng)總體結(jié)構(gòu):利用無線傳感器網(wǎng)絡(luò)對環(huán)境進(jìn)行數(shù)據(jù)采集,并通過協(xié)調(diào)器的USB串口與PC端相連接,PC端的上位機(jī)通過對數(shù)據(jù)包的分析處理,將相關(guān)信息存儲至數(shù)據(jù)庫,最后通過對數(shù)據(jù)庫的連接和訪問,實(shí)現(xiàn)對數(shù)據(jù)的統(tǒng)計(jì)和展示。在節(jié)點(diǎn)硬件選型方面,對目前市場上存在的多種型號芯片進(jìn)行了分析對比,結(jié)合成本的考慮,本系統(tǒng)決定采用TI公司的CC2530芯片,成都無線龍公司的SMBD-14底板、GDH的高精溫濕度傳感器和HC-SR501人體紅外探測傳感器。(2)通過分析目前存在的干擾檢測技術(shù)和干擾規(guī)避技術(shù),發(fā)現(xiàn)大部分檢測方法僅通過接收信號強(qiáng)度指示或誤包率來判斷網(wǎng)絡(luò)是否正在遭受WiFi干擾,而這種判斷并不準(zhǔn)確。因此本文提出了一種基于鏈路質(zhì)量和PER的干擾檢測改進(jìn)方法,該方法通過對普通節(jié)點(diǎn)和重要節(jié)點(diǎn)誤包率、出現(xiàn)誤包率節(jié)點(diǎn)所占的比重、鏈路質(zhì)量以及接收信號強(qiáng)度指示的綜合判斷,最終決定是否存在WiFi干擾。在干擾規(guī)避方法中,發(fā)部分算法即耗時(shí)又耗資源。因此本文改進(jìn)了信道選擇方式,采取前后掃描的方式,直到發(fā)現(xiàn)合適的信道,提高了規(guī)避速度。(3)利用C及C#開發(fā)語言,在IAR Embedded Workbench 8.10開發(fā)平臺實(shí)現(xiàn)了ZigBee網(wǎng)絡(luò)的設(shè)計(jì),包括:初始化網(wǎng)絡(luò)、建立網(wǎng)絡(luò)路由、溫濕度和人體紅外采集、節(jié)點(diǎn)暫時(shí)脫離網(wǎng)絡(luò)處理、探測故障節(jié)點(diǎn);在Visual Studio 2010開發(fā)環(huán)境實(shí)現(xiàn)了上位機(jī)和網(wǎng)站的開發(fā);在SQL Server 2008 R2數(shù)據(jù)庫管理系統(tǒng)實(shí)現(xiàn)了數(shù)據(jù)庫創(chuàng)建與數(shù)據(jù)存儲。最終完成了基于ZigBee的實(shí)驗(yàn)室環(huán)境監(jiān)測系統(tǒng)的設(shè)計(jì),實(shí)現(xiàn)了對環(huán)境信息的采集、傳輸、分析處理、存儲和統(tǒng)計(jì)展示,對用戶信息和被監(jiān)測房間信息的管理,并對系統(tǒng)進(jìn)行了詳細(xì)的性能測試。
[Abstract]:As an important place for teaching and scientific research in colleges and universities, the laboratory stores many kinds of precision scientific research instruments, as well as some dangerous materials, such as flammable, explosive, highly toxic, and so on. In addition, they are frequently used, and their personnel are concentrated and mobile. Sudden accidents often occur, which seriously threaten the safety of teachers and students, and at the same time bring huge losses of property to schools. Therefore, how to ensure the safety and reliability of the operating environment of scientific research instruments with lower investment, It has become a social concern to ensure the storage safety of dangerous goods and eliminate the hidden danger to the personal and property safety as far as possible. Under this background, aiming at the needs of laboratory environment monitoring in colleges and universities, this paper adopts the ZigBee technology, Based on the research of ZigBee anti-jamming technology, a laboratory environment monitoring system based on ZigBee is designed. In addition, the related jamming technology is studied to make the system resist WiFi interference. To realize the collection, transmission and processing of temperature and humidity and infrared data in wireless sensor network, Finally achieve the purpose of monitoring the laboratory environment. The concrete results obtained in this paper are as follows: 1) combined with the requirements of the laboratory monitoring system in colleges and universities, The overall structure of the monitoring system is designed in this paper: the data collection is carried out by using wireless sensor network, and the PC terminal is connected to the PC through the USB serial port of the coordinator, and the data packet is analyzed and processed. The related information is stored to the database. Finally, through the connection and access to the database, the statistics and display of the data are realized. In the aspect of node hardware selection, the paper analyzes and compares the various types of chips that exist in the market at present. Considering the cost, the system decided to adopt TI's CC2530 chip. Chengdu Wireless Dragon Company's SMBD-14 bottom board GDH high precision temperature and humidity sensor and HC-SR501 human body infrared detection sensor. 2) by analyzing the existing interference detection technology and interference circumvention technology, It is found that most detection methods only judge whether the network is suffering from WiFi interference by receiving signal strength indication or packet error rate, but this judgment is not accurate. Therefore, an improved interference detection method based on link quality and PER is proposed in this paper. This method determines whether there is WiFi interference or not by synthetically judging the packet error rate of common node and important node, the proportion of the node with packet error rate, the link quality and the indication of received signal strength. The algorithm is time consuming and resource consuming. Therefore, this paper improves the channel selection method, adopts the way of scanning before and after, until the appropriate channel is found, and improves the speed of evading. 3) using C and C # development languages. The design of ZigBee network is realized on the IAR Embedded Workbench 8.10 development platform, including: initializing the network, setting up the network route, collecting temperature and humidity and infrared data of human body, leaving the network processing temporarily, detecting the fault node; The host computer and website are developed in the Visual Studio 2010 development environment, the database creation and data storage are realized in the SQL Server 2008 R2 database management system. Finally, the design of the laboratory environment monitoring system based on ZigBee is completed. It realizes the collection, transmission, analysis and processing of environmental information, storage and statistical display, management of user information and monitored room information, and the detailed performance test of the system.
【學(xué)位授予單位】：沈陽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TP274

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