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1、ABSTRACTABSTRACTAsthespeedofspaceflyingobjectssuchasaircraftandsatellitegenerallyrangesfrom100m/sto8000m/s,itisnecessarytoreplacetheflyingobjectsandtheirinternalequipmentwithhigh-speedmotionmodelstoresearchthehigh-speedperformanceofflyingobjects.Inthecon
2、ventionalphotoelectricspeed-measuringmethod,photo-electricitysensorsarearrangedalongthemovementpatchofmodel,andthevelocitycanbecalculatedbythetimethatthemodelreachesthesensors.Comparedwithphotoelectricvelocitymeasurement,themethodofradarvelocitymeasureme
3、nthastheadvantagesoflow-cost,easytoinstall,continuousmeasuring,etc.Basedonthebackgroundofhigh-speedmovementmodel,thepaperrepresentsafront-endofspeed-measuringX-bandDopplerradar,whichworksasacontinuousspeed-measuringdeviceforthemodelandcollectsbasicdatafo
4、rfurtherstudy.Thefront-endadoptsthecoherentcontinuouswaveradartechnology,workingatthefrequencyof9GHz.Thispapercompletesschemedesignandquotadistributionofthefront-endwhichconsistsofthreefunctionalmodules:signalsourcemodule,transmittingmoduleandreceivingmo
5、dule.Thesignalsourcemoduleismadeupofaphase-lockedloopsignalsource,amicrowaveband-passfilter,asingle-stagemicrowaveamplifier,andaWilkinsonpowerdivider.Thetransmittingmoduleiscomposedoftwo-stagemicrowavepoweramplifierandtransmittingantenna.Inaddition,arece
6、ivingantenna,alow-noiseamplifier,amixer,anIFlow-passfilterandanamplifiermakeupthereceivingmodule.Inthispaper,theprincipleanddesignmethodofeachcomponentsarepresented.Thedesign,simulationandoptimizationofmicrowaveband-passfilter,powerdividerandotherpassive
7、componentsandmicrowaveamplifierarecompletedwithsoftwareADSandHFSS,whilethecircuitlayoutandcavityaredrawnwithAutoCAD.Withtheuseofspectrumanalyzerandoscilloscope,thispaperhascompletedthetestingandcommissioningofthehardwarecircuittoverifythecorrectnessofeac
8、hmodule’sdesign.Inthefont-end,transmittingandreceivingantennasadoptscoaxiallinefeedingmicrostrippatchantennas,withmicrowaveband-passfilteradoptingmicrostriplineII万方数据ABSTRACTparallelcoupledstructure,IFlow-passfilteradoptin
