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基于AD9364的CPM遥测发射机设计
Abstract:
ThispaperfocusesonthedesignofatelemetrytransmitterbasedontheAD9364chip.ContinuousPhaseModulation(CPM)isusedtotransmitdataoverlongdistanceswithahighdegreeofreliabilityandaccuracy.Thesystemisdesignedtooperateinawiderangeoffrequencies,makingitidealforuseinavarietyofapplicationssuchassatellitecommunication,remotesensing,andunmannedaerialvehicles.
Introduction:
Telemetryisacommunicationtechnologyusedtomeasureandtransmitdatafromremotelocations.Thistechnologyplaysacrucialroleinvariousfieldssuchasaerospace,defense,andmedicine.Telemetrysystemsrequireareliableandaccuratetransmissionofdataoverlongdistances.ContinuousPhaseModulation(CPM)isonesuchmodulationtechniquethatensureshighreliabilityandaccuracyintelemetrysystems.
TheAD9364chipisastate-of-the-artintegratedcircuitdesignedforuseinsoftware-definedradio(SDR)systems.Thechipsupportsawiderangeoffrequenciesandmodulationtechniques,makingitanidealchoicefortelemetryapplications.ThispaperdiscussesthedesignofatelemetrytransmitterbasedontheAD9364chip,whichusesCPMforreliableandaccuratetransmissionofdata.
Design:
Thetelemetrytransmitterconsistsofthreemaincomponents:theAD9364chip,amicrocontroller,andapoweramplifier.Themicrocontrolleractsasthecontrolunitforthesystem,whilethepoweramplifierbooststhepowerofthetransmittedsignal.TheAD9364chipservesasthetransmitter,anditconvertsthedigitalinputsignalintoananalogradiofrequency(RF)signal.
Thetransmitteroperatesinawidefrequencyrange,from70MHzto6GHz.ThemicrocontrollercontrolsthefrequencyofthetransmitterbyadjustingthesettingsoftheAD9364chip.Thisfeaturemakesthesystemversatileandidealforuseindifferentapplications.
ThedatatobetransmittedisfirstmodulatedusingContinuousPhaseModulation(CPM).CPMisaformofconstantenvelopemodulationthatusesphaseshiftstoencodedata.Thephaseshiftsarecarefullychosentoensurethatthetransmittedsignaliscontinuousandsmooth,whichreducesthechancesoferrorsduringtransmission.
ThemodulatedsignalisthenpassedthroughtheAD9364chip,whichconvertsitintoananalogRFsignal