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ID:39065943
大小:671.67 KB
页数:8页
时间:2019-06-24
《Time Delay Digital Beamforming for Wideband Pulsed Radar Implementation英文资料》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、TimeDelayDigitalBeamformingforWidebandPulsedRadarImplementationColmanCheung,RonakShah,MichaelParkerAlteraCorporationSanJose,CAccheung@altera.com,rshah@altera.com,mparker@altera.comAbstract—RadarsystemhasbeenusingahybridofanalogTheFastFourierTransformmethodhasbeenverypopularan
2、ddigitalbeamforming.Sub-arraysofphaseshiftersintheindigitalbeamformingduetoitshighlyefficientanalogdomainaredigitizedatthesub-arrayoutputsforfurtherimplementation.Itworksverywellfornarrowband,butfardigitalbeamformingprocessing.Suchsystemsuffersfromfromidealforbroadbandsignals
3、.limitedbandwidthandisunabletocreatemorethanonesimultaneousbeam.DigitaltimedelaybeamformingbringsFullTimedelaydigitalbeamformingeliminatesdrawbacksmanybenefitssuchaswidebandwidthpulsewaveformandfromanalogbeamformingandprovidesadditionalbenefitslikesimultaneousbeamsatdifferent
4、angles,waveformsandsimultaneousbeamsatdifferentangles,waveformsandfrequencies.Suchcapabilitiesmayhavebeendeemedtoofrequencies.Arbitrarysegmentationofarrayandarbitraryexpensiveinthepast,butisnowwithinreachduetothehighshapeofantennapatterncanalsobeachieved.Thesepropertiesdensit
5、yofmultipliersintheFPGAandintroductionofarecriticalto(multiple)timesensitivemissions.FortransceiverbasedADC(AnalogtoDigitalConverter)/DAC(DigitaltoAnalogConverter).Thispaperwillpresentthedesignbroadbandsignals,timedelayswithdigitalsignalprocessingandimplementationofafractiona
6、ldelay(FD)filterusedintimecanproduceverypreciseresults.SuchcapabilitiesmayhavedelaybeamformingwithAlteraFPGAsandtools.Otherbeendeemedtooexpensiveinthepastbutisnowwithinreachbeamformingissueslikewidebandwidth,adaptivebeamformingduetothehighdensityofmultipliersintheFPGAandthean
7、dhighdensityinterconnectarchitecturesforphasedarraysrobusthighspeedserialinterfacesofADC(AnalogtoDigitalwillalsobeinvestigated.Converter)/DAC(DigitaltoAnalogConverter).Keywords—Timedelay;Beamforming;Nyquistfilter;FPGA;SectionIIdescribesthedesignandimplementationofanPhasedarra
8、y;Cholesky;QRDecomposition;FPGAefficientFD(FractionalDelay)filter.Se
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