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1、http://www.paper.edu.cnBayesianMaximumAPosteriorDOAEstimatorBasedonImportanceSamplingDaXie,JianguoHuangCollegeofMarine,NWPUCollegeofMarine,NWPUXi'an,710072,ChinaXi'an,710072,Chinaxieda527@mail.nwpu.edu.cnjghuang@nwpu.edu.cnXiongLiQunfeiZhangCollegeofMarine,NW
2、PUCollegeofMarine,NWPUXi'an,710072,ChinaXi'an,710072,Chinalixiongxa@hotmail.comqfzhang7@nwpu.edu.cnAbstractDOAestimationisanimportantresearchareainarraysignalprocessing.BayesianmaximumaposteriorprobabilitydensityDOAestimator(BMDOAestimator)hasbeenshowntoperfo
3、rmperfectly.However,theBMestimatorrequiresamultidimensionalgridsearchandthecomputationalburdenincreasesexponentiallywiththedimension.Soitisdifficulttobeusedinrealtimeapplications.Inordertoreducethecomputation,MonteCarlomethodsarecombinedwithBMDOAestimator.Ano
4、velBayesianmaximumaposteriorDOAestimatorbasedonimportancesampling(ISBMDOAestimator)isproposedinthispaper.ISBMDOAestimatornotonlykeepsthegoodperformanceoftheoriginalBMDOAestimator,butalsoreducesthecomputationobviouslybecauseitneedsnotmultidimensionalsearchandr
5、educesthecomputationalcomplexityoftheoriginalKmethodfromO(L)toO(K×H).SimulationresultsshowthatISBMDOAestimatorkeepsthesuperiorperformanceofBMDOAestimator,butalsoreducesthecomputationevidentlyandperformsbetterthanMUSICandMiniNorm,especiallyinthecaseoflowSNRs.K
6、eywords:DOA,Bayesian,importancesampling,computation1IntroductionHigh-resolutionDOAestimationisanimportantresearchareainarraysignalprocessing.Thebreakthroughofthetechniqueisgreatlymeaningfulinmanyresearchfieldssuchassonar,radar,communication,biomedicalengineer
7、ing,geologyandsoon.Theunderwateracoustichighresolutionmultisourcedirectionfindingisoneofthekeytechniquetounderwatersearchingandoceanexploration.DOAestimationhascapturedmuchattentioninpasttwodecades,andmanymethodshavebeenproposedforimprovingtheperformanceofthe
8、conventionalbeamformers.supportedbySpecializedResearchFundfortheDoctoralProgramofHigherEducationofChina(20020699021)andNationalNaturalScienceFoundationofChina(No.60272076).1http://www.pap
