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1、武漢理f大學(xué)碩士學(xué)位論文摘要針對(duì)設(shè)備以有線方式接入Intemet的不足,本文研究了一種基于GPRS網(wǎng)絡(luò)的無(wú)線接入Intemet方案。利用GPRS網(wǎng)絡(luò)的覆蓋范圍廣、數(shù)據(jù)傳輸率高等特點(diǎn)【”,可以方便快捷地將設(shè)備接入Internet,特別適合用于野外工業(yè)現(xiàn)場(chǎng)或不方便通過(guò)有線方式接入的設(shè)備。論文以路燈監(jiān)控系統(tǒng)為例,詳細(xì)介紹了基于GPRS網(wǎng)絡(luò)的無(wú)線接入Internet方案的具體實(shí)現(xiàn)過(guò)程,并分析了GPRS網(wǎng)絡(luò)傳輸中的問(wèn)題。該監(jiān)控系統(tǒng)實(shí)現(xiàn)的主要功能為按照設(shè)定的日出日落時(shí)間設(shè)定開(kāi)關(guān)燈時(shí)間,監(jiān)控節(jié)點(diǎn)由電壓互感器和電流互感器對(duì)各路段路燈的電力參數(shù)進(jìn)行實(shí)時(shí)采集,將采集到的數(shù)據(jù)進(jìn)行分析和存儲(chǔ)。監(jiān)控
2、節(jié)點(diǎn)通過(guò)GPRS網(wǎng)絡(luò)連入Intemet,將采集到的工作參數(shù)上傳到監(jiān)控中心,監(jiān)控中心可以通過(guò)順序查詢(xún)不同遠(yuǎn)程監(jiān)控節(jié)點(diǎn),監(jiān)視個(gè)設(shè)備的運(yùn)行狀態(tài)。主要的內(nèi)容包括以下幾個(gè)方面:1)分析目前常見(jiàn)的四種數(shù)據(jù)傳輸?shù)姆绞?,通過(guò)比較分析各自的優(yōu)缺點(diǎn),確定了通過(guò)GPRS技術(shù)進(jìn)行遠(yuǎn)程數(shù)據(jù)的傳輸方案。2)對(duì)控制節(jié)點(diǎn)的整體結(jié)構(gòu)進(jìn)行框架搭建,完成了監(jiān)控節(jié)點(diǎn)的電力參數(shù)采集電路、開(kāi)關(guān)狀態(tài)量檢測(cè)電路、繼電器輸出電路、GPRS通訊電路等硬件設(shè)計(jì),實(shí)現(xiàn)了采集數(shù)據(jù)的存儲(chǔ)和讀取;開(kāi)關(guān)量輸入\輸出的控制、時(shí)間設(shè)定和讀取以及數(shù)據(jù)的傳輸。上位機(jī)通過(guò)Internet實(shí)現(xiàn)對(duì)監(jiān)控節(jié)點(diǎn)的遠(yuǎn)程控制。3)從GPRS網(wǎng)路和VPN兩方面增
3、強(qiáng)了系統(tǒng)的安全性,使數(shù)據(jù)在網(wǎng)路傳輸過(guò)程中的可靠性得到保證。通過(guò)實(shí)驗(yàn)測(cè)試了網(wǎng)路傳輸中的數(shù)據(jù)時(shí)延和丟包率,并進(jìn)行分析提出解決方案。關(guān)鍵詞:GPRS通訊,CMS91,TCP/IP協(xié)議,Intemet武漢理工大學(xué)碩士學(xué)位論文ABSTRACTInviewoftheinsufficiencywiththewiredaccesstoInternet.thisthesisresearchesaschelne曲outthemethodbasingontheGPRSwirelessnetworkforaccessingtoInternet.WiththefeaturesofbroadCOVel
4、"andllighrateofdataoutput,itisconvenientt0connecttheequipmentswithIntemetandsuitabletoapplyintheOpeTtindustryso髓臻OrSOl'fiefacilitywhichholdsbackthewiredway.Takingthemonitoringsystemofstreetlightastheexample,thisarticleintroducestheprocessofmonitoringnodesIndetail,andanalyzesthetransmission
5、intheGPRSnetwoIkThemainfunctionsofthissystemistosetthetimeofturning011orturningo行l(wèi)ightsforthesunri∞orsunsettime,themonitoringnodes02tiTlesonreal—timesamplingbythevoltagetmnsformcrandthecurrenttransformertoanalyzeandstoreall1"Oadsectionsstreetlightelectricparameter.ThemonitoringnodesentersI
6、nteractthroughtheGPRSne咖fl('gatherstheoperationalparameterandpasstothemonitoringcerttel'.Themonitoringcentermayinquirydiffercntlong-distancemonitoringnodesiIlorder,thusgettheinformationoftheequipment’srunningstate.Thist11esisreferstoseveralpointsaSfollows:nItanalyzescommonwaysofdatatransmi
7、ssionanddeterminesaplanoflong-distancetransmissionbasingOnthetechnologyofGPRS2)Afterschematicd/agramsdesign,pratedcircuitboardsdesignandelementsjointing,itachievessomecircl
8、itsincludingthedrcuitforgatheringtheparametersofnodes,thecircuitformonitoringthestateof