简介:Thedegradationdataofmulti-componentsinmissileisderivedbyperiodicaltesting.Howtousethesedatatoassessthestoragereliability(SR)ofthewholemissileisadifficultproblemincurrentresearch.AnSRassessmentmodelbasedoncompetitionfailureofmulti-componentsinmissileisproposed.Byanalyzingthemissilelifeprofileanditsstoragefailurefeature,thekeycomponentsinmissileareobtainedandthecharacteristicsvoltageisassumedtobeitskeyperformanceparameter.Whenthevoltagetestingdataofkeycomponentsinmissileareavailable,astatespacemodel(SSM)isappliedtoobtainthewholemissiledegradationstate,whichisdefinedasthemissiledegradationdegree(DD).AWienerprocesswiththetime-scalemodel(TSM)isappliedtobuildthedegradationfailuremodelwithindividualvariabilityandnonlinearity.TheWeibulldistributionandproportionalriskmodelareappliedtobuildanoutburstfailuremodelwithperformancedegradationeffect.Furthermore,acompetitionfailuremodelwiththecorrelationbetweendegradationfailureandoutburstfailureisproposed.Anumericalexamplewithasetofmissilesinstorageisanalyzedtodemonstratetheaccuracyandsuperiorityoftheproposedmodel.
简介:Analgorithmofhighlymaneuveringtargettrackingisproposedtosolvetheproblemoflargetrackingerrorcausedbystrongmaneuver.Inthisalgorithm,anewestimator,namedasmulti-parameterfusionSinger(MF-Singer)modelisderivedbasedontheSingermodelandthefuzzyreasoningmethodbyusingradialaccelerationandvelocityofthetarget,andappliedtotheproblemofmaneuveringtargettrackinginstrongmaneuveringenvironmentandoperatingenvironment.ThetrackingperformanceoftheMF-Singermodelisevaluatedandcomparedwithothermanueveringtrackingmodels.ItisshownthattheMF-Singermodeloutperformsthesealgorithmsinseveralexamples.
简介:Inthispaper,weproposeadynamicmulti-descriptorfusion(DMDF)approachtoimprovingtheretrievalaccuracyof3-dimensional(3D)modelretrievalsystems.First,anindependentretrievallistisgeneratedbyusingeachindividualdescriptor.Second,weproposeanautomaticrelevant/irrelevantmodelsselection(ARMS)approachtoselectingtherelevantandirrelevant3Dmodelsautomaticallywithoutanyuserinteraction.Aweighteddistance,inwhichtheweightassociatedwitheachindividualdescriptorislearntbyusingtheselectedrelevantandirrelevantmodels,isusedtomeasurethesimilaritybetweentwo3Dmodels.Furthermore,adescriptor-dependentadaptivequerypointmovement(AQPM)approachisemployedtoupdateeveryfeaturevector.Thissetofnewfeaturevectorsisusedtoindex3Dmodelsinthenextsearchprocess.Four3DmodeldatabasesareusedtocomparetheretrievalaccuracyofourproposedDMDFapproachwithseveraldescriptorsaswellassomewell-knowninformationfusionmethods.ExperimentalresultshaveshownthatourproposedDMDFapproachprovidesapromisingretrievalresultandalwaysyieldsthebestretrievalaccuracy.
简介:Theanalog-to-informationconvertor(AIC)isasuccessfulpracticeofcompressivesensing(CS)theoryintheanalogsignalacquisition.Thispaperpresentsamulti-narrowbandsignalssamplingandreconstructionmodelbasedonAICandblocksparsity.Toovercomethepracticalproblems,theblocksparsityisdividedintouniformblockandnon-uniformblocksituations,andtheblockrestrictedisometrypropertyandsub-samplinglimitindifferentsituationsareanalyzedrespectivelyindetail.TheoreticalanalysisprovesthatusingtheblocksparsityinAICcanreducetherestrictedisometricconstant,increasethereconstructionprobabilityandreducethesub-samplingrate.Simulationresultsshowthattheproposedmodelcancompletesub-samplingandreconstructionformulti-narrowbandsignals.ThispaperextendstheapplicationrangeofAICfromthefiniteinformationratesignaltothemulti-narrowbandsignalsbyusingthepotentialrelevanceofsupportsets.Theproposedreceivingmodelhaslowcomplexityandiseasytoimplement,whichcanpromotetheapplicationofCStheoryintheradarreceivertoreducetheburdenofanalog-todigitalconvertor(ADC)andsolvebandwidthlimitationsofADC.
简介:由于嵌入的设备的限制尽最大努力以精力,处理力量,和记忆缩放的无线连接和资源和有损耗的网络(LLN)的unreliability,网络拥挤可以在一种紧急情况发生并且导致重要的包损失和端对端的延期。减轻网络拥挤的效果,这份报纸基于多度量标准(CCRPM)建议一个集中的拥挤控制路由协议。让候选人父母在网络建设的过程减少网络拥挤的概率联合一个节点,缓冲区占有率,无线连接质量,和亚节点的当前的数字的剩余精力。另外,当网络拥挤发生时,决定拥挤的节点的亚节点是否需要基于交通分析被交换采用一个集中的方法。理论分析和广泛的模拟结果证明与存在路由协议相比,CCRPM的性能在减少网络拥挤的概率显著地被改进,延长平均网络一生,增加网络产量,并且减少端对端的延期。
简介:Asanimportantapplicationresearchtopicoftheintelligentaviationmulti-station,collaborativedetectingmustovercometheproblemofscoutingmeasurementwithstatusof“fragmentation”,andtheNP-hardnessproblemofmatchingassociationbetweentargetandmeasurementintheprocessofscoutingtodata-link,whichhascomplicatedtechnicalarchitectureofnetworkconstruction.Inthispaper,takingadvantageofcooperationmechanismonsignallevelintheaviationmulti-stationsympatheticnetwork,amethodofobtainingtargettimedifferenceofarrival(TDOA)measurementusingmulti-stationcollaborativedetectingbasedontime-frequencyassociationisproposed.Themethodcannotonlyachievematchingbetweentargetanditsmeasurement,butalsoobtainTDOAmeasurementbyfurtherevolutionarytransactionthroughrefreshingsequentialpulsetimeofarrival(TOA)measurementmatrixformatchingandcorrelating.SimulationresultsshowthattheaccuracyofTDOAmeasurementhassignificantsuperiorityoverTOA,anddetectionprobabilityoffalseTDOAmeasurementintroducedbynoiseandfakemeasurementcanbereducedeffectively.
简介:Hyper-spectralimagingspectrometerhashighspatialandspectralresolution.Itsradiometriccalibrationneedstheknowledgeofthesourcesusedwithhighspectralresolution.Inordertosatisfytherequirementofsource,anon-orbitradiometriccalibrationmethodisdesignedinthispaper.Thischainisbasedonthespectralinversionaccuracyofthecalibrationlightsource.Wecompilethegeneticalgorithmprogresswhichisusedtooptimizethechanneldesignofthetransferradiometerandconsiderthedegradationofthehalogenlamp,thusrealizingthehighaccuracyinversionofspectralcurveinthewholeworkingtime.Theexperimentalresultsshowtheaveragerootmeansquarederroris0.396%,themaximumrootmeansquarederroris0.448%,andtherelativeerrorsatallwavelengthsarewithin1%inthespectralrangefrom500nmto900nmduring100hoperatingtime.Thedesignlaysafoundationforthehighaccuracycalibrationofimagingspectrometer.
简介:Atunableself-seededmulti-wavelengthBrillouin-erbiumfiberlaser(BEFL)isproposedanddemonstratedbasedonafew-modefiberfilter(FMFF)withvaryingtemperature.TheFMFFconfigurationisasectionofuncoatedfew-modefiber(FMF)sandwichedbetweentwoup-tapers.Asthetemperaturevariesfrom25°Cto125°C,thetransmissionspectrumofFMFFmovestowardsthelongerwavelength.Theself-excitedBrillouinpumpisinternallyachievedbycascadedstimulatedBrillouinscattering(SBS)inthesinglemodefiber(SMF).ThenemployingtheFMFFtemperaturevariationcharacteristicsintheringcavityfiberlaser,themulti-wavelengthoftheoutputlasercanbetuned,andthetunablerangeisabout8.0nm.Thegenerationofupto15BrillouinStokeswavelengthswith16dBopticalsignal-to-noiseratio(OSNR)isrealized.