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1、壓力式水深測量儀的研制摘要水深測量，一直是水文研究領(lǐng)域的一項(xiàng)重要研究內(nèi)容．隨著現(xiàn)代電子技術(shù)、檢測技術(shù)和計(jì)算機(jī)控制技術(shù)的發(fā)展，人們對檢測到的水深數(shù)據(jù)的精確性要求越來越高，而且測深儀表向高精度、數(shù)字化、智能化、小型化方向發(fā)展。本文介紹了一種壓力式水深測量儀器的設(shè)計(jì)方案，主要內(nèi)容包括：液位變送器設(shè)計(jì)原理；GPS接收機(jī)的原理和應(yīng)用：USB主機(jī)方式的實(shí)現(xiàn)；測量系統(tǒng)硬件設(shè)計(jì)，主要包括：電源電路設(shè)計(jì)、數(shù)據(jù)采集電路設(shè)計(jì)、時(shí)鐘電路設(shè)計(jì)、打印機(jī)電路設(shè)計(jì)、液晶顯示電路設(shè)計(jì)、數(shù)據(jù)存儲電路設(shè)計(jì)，u盤讀寫電路設(shè)計(jì)、串口擴(kuò)展電路
2、設(shè)計(jì)、鍵盤電路設(shè)計(jì)等：測量系統(tǒng)驅(qū)動軟件設(shè)計(jì)和上位機(jī)人機(jī)界面設(shè)計(jì)。設(shè)計(jì)出的儀器具有多種數(shù)據(jù)輸出方式，測得的水深數(shù)據(jù)配以時(shí)問和經(jīng)緯度，為水深監(jiān)測和繪制水底地形圖奠定了基礎(chǔ)。實(shí)驗(yàn)結(jié)果表明：該系統(tǒng)具有精度高、可靠性好的特點(diǎn)，適用于湖泊、水庫、江河等水域的水深測罱工作。此外，為了保證系統(tǒng)長期穩(wěn)定運(yùn)行，本系統(tǒng)設(shè)計(jì)從硬件和軟件兩方面出發(fā)盡可能提高系統(tǒng)的可靠性。硬件可靠性主要從：g片選型、電路設(shè)計(jì)、布局布線等方面考慮，軟件的可靠性主要通過模塊化編程和較好的異常化處理等方面保證?，F(xiàn)在本系統(tǒng)在實(shí)驗(yàn)室已經(jīng)調(diào)試成功，各項(xiàng)指
3、標(biāo)基本達(dá)到了設(shè)計(jì)要求。關(guān)鍵詞：測深，液位變送器，GP$，u盤StudyandDesignofthePressedWater-DepthMeterAbstractThemeasurementforwaterdepthisallimportantissueinthefieldofhydrologicstudy．Withtherapiddevelopmentofelectronictechnology,measurementtechnologyandcomputercontroltechnology,pe
4、opleaskformoreandmoreaccuratewaterdepthdata,andthemeasuringinstrumentdevelopstowardsthedirectionofhighaccumcy,Digitization，intelligenceandminiaturization．Thisintroducesaproposeddesignontheplungedwaterdepthmeteringequipment,whichmainlyincludesthefollowi
5、ngaspects：designprincipleofliquid-leveltransmitter,theprincipleandapplicationofGPSreceiver,therealizationofUSBhostway,hardwarecircuitdesignwhichincludespowersupplycircuit,datacollectingcircuit,clockcircuit，printercircuit,LCDcircuit,U-diskR／Wcircuit,ser
6、ialportcircuit,keyboardcircuit,softwaredesign，Man-machineinterfacedesign．Thisinstrumentisdesignedtooutputdatainmulti—ways,thosewater-depthdatatogetherwiththerelateddatasofdate,longitudeandlatitudecanlaythegroundforwater-depthinspectionandunderwatertopo
7、graphicplotting．Thetrialrunningofthisinstrumentshowedthatthissystemcanworkwithhighaccuracyandreliabilityandabetterchoiceformeasuringwaterdepthofriver,lakeandreservoir．inaddition,formakingsurethelong-playingrunningofthesystem，thisthesisimprovesitsreliab
8、ilityintwoways．Theselectionofthechips，thedesignofthecircuitandthelayoutoftheprintedcircuitarealltakenintofullconsiderationduringthehardwaredesign．Thereliabilityofthesoftwareisensuredbymodulecodingandabnormityprocessing．Atpresentthissyst
