Time Delay Digital Beamforming for Wideband Pulsed Radar Implementation英文资料

Time Delay Digital Beamforming for Wideband Pulsed Radar Implementation英文资料

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时间:2019-06-24

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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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