FDR土壤墑情傳感器的研究與實(shí)現(xiàn).pdf

1、論文題目：FDR土壤墑情傳感器的研究與實(shí)現(xiàn)工程領(lǐng)域：電子與通信工程碩士生：阮磊（簽名）__________指導(dǎo)教師：張曉莉（簽名）__________摘要豐富而準(zhǔn)確的土壤墑情信息對(duì)研究水循環(huán)變化規(guī)律、水資源合理利用、農(nóng)林牧業(yè)精準(zhǔn)灌溉和抗旱救災(zāi)等工作發(fā)揮重要作用。而現(xiàn)今我國(guó)土壤墑情檢測(cè)主要依靠經(jīng)驗(yàn)估計(jì)，墑情信息獲取難度大且準(zhǔn)確性差。隨著數(shù)據(jù)通信技術(shù)的發(fā)展，將無(wú)線(xiàn)通信技術(shù)、計(jì)算機(jī)網(wǎng)絡(luò)及土壤檢測(cè)技術(shù)結(jié)合起來(lái)實(shí)現(xiàn)對(duì)土壤墑情的準(zhǔn)確智能檢測(cè)是大勢(shì)所

2、趨。本文對(duì)比了國(guó)內(nèi)外土壤墑情檢測(cè)方法的優(yōu)劣，選定頻域反射法（FDR）為土壤墑情檢測(cè)實(shí)現(xiàn)方法，以S3C2440A為嵌入式處理器，Linux為嵌入式操作系統(tǒng)提出了土壤墑情傳感器的設(shè)計(jì)方案。該傳感器由模擬信號(hào)輸入模塊、信號(hào)處理模塊、顯示模塊、存儲(chǔ)模塊、通信模塊和供電單元組成，模擬信號(hào)輸入模塊實(shí)現(xiàn)墑情信息與電信號(hào)的轉(zhuǎn)換，由LC諧振電路、128分頻電路、波形轉(zhuǎn)換電路、濾波電路和信號(hào)放大電路組成。在嵌入式Linux平臺(tái)上，完成uboot的修改，ke

3、rnel的定制和root的構(gòu)建，并將其移植到傳感器上?；贚inux軟件開(kāi)發(fā)環(huán)境實(shí)現(xiàn)傳感器驅(qū)動(dòng)和測(cè)試功能。對(duì)FDR土壤墑情傳感器進(jìn)行實(shí)地測(cè)試，測(cè)試結(jié)果表明，該傳感器能夠準(zhǔn)確測(cè)量、顯示土壤墑情，并且將其通過(guò)3G模塊，以PDU格式發(fā)送至終端設(shè)備，具有高精度、高靈敏性、高實(shí)時(shí)性和操作便捷等特點(diǎn)。關(guān)鍵詞：頻域反射法；嵌入式系統(tǒng)；PDU；3G模塊研究類(lèi)型：應(yīng)用研究型Subject：ResearchimplementationofFDRsoilmo

4、isturesensSpecialty：ElectronicCommunicationEngineeringName：RuanLei(Signature)Instruct：ZhangXiaoli(Signature)ABSTRACTRichaccuratesoilmoistureinfmationplaysanimptantroletothestudyofchangelawonwatercyclerationalutilizationo

5、fwaterresourcesprecisionirrigationonagriculturefestryanimalhusbrydroughtreliefwk.ButnowsoilmoisturedetectionreliesmainlyontheempiricalestimateshavinggreatdifficultiespoaccuracyinsoilmoistureinfmationacquisitioninChina.Wi

6、ththedevelopmentofdatacommunicationtechnologythegeneraltrendistocombinethewirelesscommunicationtechnologycomputerwkssoildetectiontechnologytorealizedetectionofsoilmoistureinfmation.Thispapercomparesdifferentsoildetection

7、methodsinChinaabroadchoosesfrequencydomainreflectometry(FDR)torealizethesoilmoisturedetectionproposesthedesignschemefsoilmoisturesenswithS3C2400AastheembeddedprocessLinuxastheembeddedoperatingsystem.Thesensiscomposedofan

8、alogsignalinputmodulesignalprocessingmoduledisplaymodulememymodulecommunicationmodulepowersupplyunit.TheanalogsignalinputmoduleimplementstheconversionofmoisturetoelectricsignalwhichconsistsLCresonancecircuit128frequencyd

9、ividingcircuitwavefmconversioncircuitfilteringcircuitsignalamplificationcircuit.ThepapersetsuptheembeddedLinuxplatfmmodifiestheubootcustomsthekernelconstructstheroottransplantsthemtothesens.BasedontheLinuxsoftwaredevelop

10、mentenvironmentthesensdrivertestingproceduresaredesignedcompleted.ThefieldtestingresultofFDRsoilmoisturesensshowsthatthesenscouldmeasuredisplaythemoisturepreciselytransmitthemoisturetoterminalequipmentinPDUfmatthrough3Gm