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1、HybridRadarSignalFusionforUnresolvedTargetDetectionN.Nandakumaran,A.SinhaandT.KirubarajanEstimation,TrackingandFusionLaboratory(ETFLab)DepartmentofElectricalandComputerEngineering,McMasterUniversityHamilton,Ontario,Canadananthi@grads.ece.mcmaster.ca,abhijit@mail
2、.ece.mcmaster.ca,kiruba@mcmaster.caABSTRACTRadarsystemshavegoodradialresolution,buttheyhavepoorangularresolutionthatresultsinunresolvedmeasurements.Thisproblemcanbemitigatedbyutilizingthespatialdiversityofmultistaticradarsystem.Inthispaper,thedetectionofunresolv
3、edtargetswithahybridradarsystemusingsignallevelfusionisconsidered.Thesystemconsistsoftworeceivers:oneisco-locatedwiththetransmitterandtheotherislocatedfarfromthetransmitter.Theareaofinterest,wherethetransmitterisfocusedon,isdividedintogrids,whichareformedbycircu
4、larrangebinsofthemonostaticreceiverandellipticalrangebinsofthebistaticreceiver.Assumingthesegridsaregoodenoughtoresolvethetargets(i.e.,eachgridhasatmostonetargetandviceversa),theamplitudesofthetargets(correspondingtoallgrids)thatmaximizethelikelihoodsofthesignal
5、sobtainedfrombothreceiversaredetermined.Theseoptimumvaluesarethencomparedagainstathresholdforthefinalde-cision.Simulationstudiesareperformedtodemonstratetheproposedalgorithmforhybridradarsystemwithunresolvedtargets.Thesimulationresultsconfirmtheenhancementindetect
6、ionofunresolvedtargetsbyfusingcoherentlyreceivedsignalsfrombothmonostaticandbistaticreceivers.Keywords:Unresolvedtargets,closely-spacedtargets,hybridradar,bistaticradar,signalfusion.1.INTRODUCTIONRadarsystems,ingeneral,havegoodradialresolution,buttheyhavepoorang
7、ularresolution[11].Thispoorresolutionmayresultinmergedmeasurements,whichinturnresultinhigherrorsintheensuingdataassociationandtrackfilteringalgorithms.Someattemptshavebeenmadeintheliteraturetomitigatethisproblem.Forexample,in[1]and[10],thecomplexmonopulsesignalso
8、famonostaticsystemaresuccessfullyexploitedinthedetectionofunresolvedtargets.However,itisshownin[14]thatthesemethodsarerestrictedtoresolvetwounresolvedtargetsbytheavai
