1、北京工業(yè)大學碩士學位論文基于DDS技術的移動水聲遙控信號發(fā)射平臺的研究姓名：羅維平申請學位級別：碩士專業(yè)：電路與系統(tǒng)指導教師：王鐵流20070501北京工業(yè)大學工學碩士學位論文ABSTRACTThispaperpresentsaemitterofunderwateracousticremotecontrolsystemwithlowpowercostandportabilityfeatuersThepartoftheemitterwhi

2、chproducesunderwateracousticsignaladoptsdirectdigitalfrequencysynthesis(DDS)technologyDuetotheuseof(DDS)technologytherequirementofmodemunderwateracousticcommunicationisbesatisfied，andthecircuit’ssoftwareandhardwarebecome

3、verysimpleThemaincontributionsinthisdissertationareasfollows：1AnalysingthephysicalcharactefistiesofunderwateracousticchannelAccordingtothecorrelativeunderwateracousticcommunicationtechnologyandthecharacteristicofunderwat

4、eracousticremotecontrolsystemtochooseaappropriatemodulationmodeforsignalencodinganddecoding2BasingontheDDSchipAD9833anditsSPIinterfacetosimplifythecircuit’Ssoftwareandhardware，andproducetheunderwateracousticremotecontrol

5、signalbyadoptingFSKmodulationmode；anymore，AD9833hasexpandabilityitCanimplementsweepfrequencymodulationandproducePSKandASKmodulatingsignal3Esmblishingahardwaredevelopmentplatformbasedon32bitsARM7microcontrollerThepowerful

6、controlandprocessingcapabilityofARM7microcontrollerimpmvestheperformenceoftheemitterandsettlesthefoundationforthefuturecomplicatedapplication4Establishingasoftwaredevelopmentplatformbasedonathreelayersframeworkthatcontai

7、nscore、driverandapplicationprogram，toimplementeffectivemutitasksmanagementandenhancesystemrealtimecapability5AdoptingLCDtoshowtherealtimestatusesandparametersoftheemitterandimplementwellman—machineconversitom6Accomplishi