简介：Vehicleanti-collisiontechniqueisahottopicintheresearchareaofIntelligentTransportSystem.Theresearchonprecedingvehiclesdetectionandthedistancemeasurement,whicharethekeytechniques,makesgreatcontributionstosafe-driving.Thispaperpresentsamethodwhichcanbeusedtodetectprecedingvehiclesandgetthedistancebetweenowncarandthecarahead.Firstly,anadaptivethresholdmethodisusedtogetshadowfeature,andashadow!areamergingapproachisusedtodealwiththedistortionoftheshadowborder.Regionofinterest(ROI)isobtainedusingshadowfeature.ThenintheROI,symmetryfeatureisanalyzedtoverifywhethertherearevehiclesandtolocatethevehicles.Finally,usingmonocularvisiondistancemeasurementbasedoncamerainteriorparametersandgeometricalreasoning,wegetthedistancebetweenowncarandtheprecedingone.Experimentalresultsshowthattheproposedmethodcandetecttheprecedingvehicleeffectivelyandgetthedistancebetweenvehiclesaccurately.

简介：反假冒的一个纸信息和基于人的视觉特征和形态学屏幕，编码技术被建议的tamper-proofing方法。通过控制屏幕点阵式的数学形态学的分发，警告标记和信息在背景质地被隐藏。因为人的视觉和拷贝机器的副本特征之间的差别，不能被人的眼睛区别的警告标记将出现在拷贝以后。捣弄或假冒的证书能被比较从证书的扫描图象被提取，普通文本在证书上打印了的嵌入的信息验证。这个方法在许多钞票和证书被使用。试验性的结果证明鉴定精确性超过98%

简介：获得supercontinuum(SC)的一个新方法为散布的复合协调反司烧拉曼(汽车)的来源显微镜学被建议。在有在800.9nm的中央波长的femtosecond脉搏激光的photonic水晶纤维(PCF)的非线性的繁殖与分级的波浪理论被学习。基于事件激光力量和PCF的分散，为复合汽车显微镜学的超级宽带来源被设计。

简介：Atpresentwhatarethekeypointsfocusedintheresearchofloop-delayestimationforthedigitalpredistorterintheradiofrequency(RF)poweramplifiersystemisreducingitscomplexityofengineeringrealizationandimprovinganti-jammingabilityandcomputationalspeed.Besides,openingupitsapplicationscopeshouldbecontained.Forthesetargets,anovelmethodincludingintegerloopdelayestimationandfractionalpartisproposed.Theintegerpartappliesamplitude-differencesummationfunctionandthefractionaloneadoptsthemethodoffiniteimpulseresponse(FIR)linearinterpolation.Thealgorithmfindswideapplications.Whatismore,stronganti-jammingabilityandlowcomplexityarealsoitsmerits.Simulationresultssupporttheaboveopinion.Digitalpredistortion(DPD)systembasedonthisalgorithmachievesgoodperformance.

简介：UsingTime-VaryingAR(TVAR)modelandadaptivenotchfilterisanewmethodforthenon-stationaryjammersuppressioninDirectSequenceSpreadSpectrum(DSSS).TheperformanceofTVARmodelforInstantaneousFrequency(IF)estimationwillbeaffectedbysomefactorssuchasbasisfunctions.Focusingonthisproblem,theoptimalbasisfunctionofTVARmodelfortheIFestimationoftheLFMsignalisobtainedinthispaper.Besidesthedepthandwidthofnotching,thephasepropertiesofnotchfilteraffecttheSignal-to-Interferenceplus-NoiseRatio(SINR)ofcorrelationoutputtothenarrowbandjammersuppressioninDSSS,inresponsetotheproblemtheclosedsolutionofcorrelationoutputSINRimprovementhasbeenderivedwhenasinglefrequencyjammerpassesthroughdirectIIRnotchfilter,anditsperformancehasbeencomparedwiththoseoffivecoefficientFIRfilters.Later,anovelmethodforLFMjammersuppressionbasedonFourierbasisTVARmodelanddirectIIRnotchfilterisproposed.Thesimulationresultsshowtheeffectivenessoftheproposedmethod.

简介：Toeliminatethealiasingthatappearedduringthemeasurementofmulti-componentsnonstationarysignals,anovelkindofanti-aliasingalgorithmbasedontheshorttimeFouriertransform(STFT)isbroughtforward.Firstthephysicalessenceofaliasingthatoccursisanalyzed;secondtheinterpolationalgorithmmodelissetupbasedontheHammingwindow;thenthefastimplementationofthealgorithmusingtheNewtoniterationmethodisgiven.Usingthenumericalsimulationthefeasibilityofalgorithmisvalidated.Finally,theelectricalcircuitexperimentshowsthepracticalityofthealgorithmintheelectricalengineering.

简介：Tosolvetheflightsafetyproblemcausedbynonlinearinstabilities(categoryIIpilotinducedoscillations,PIOs)oftheclosed-looppilot-vehiclesystemwithrate-limitingactuator,theantiwindup(AW)compensationmethodtoavoidcategoryIIPIOsisinvestigated.Firstly,theAWcompensationmethodoriginallyusedforcontrollinginputmagnitudelimitedsystemisintroduced,thenthismethodisextendedforcontrollinginputrate-limitingsystemthroughacirclecriteriontheorem.Secondly,theestablishmentoftheAWcompensatoristransformedintothesolvingoflinearmatrixinequalities.Finally,anAWcompensatorestablishmentalgorithmfortheclosed-looppilot-vehiclesystemwiththerate-limitingactuatorisobtained.TheeffectivenessoftheAWcompensationmethodtoavoidcategoryIIPIOsisvalidatedbytime-domainsimulations,andcomparedwithrate-limitedfeedback(RLF)commandratecompensationmethod.TheresultsshowthattheAWcompensationmethodcaneffectivelysuppresscategoryIIPIOsandmaintainthenominalperformancewhentheclosed-looppilot-vehiclesystemisnormal.Unlikethecommandratecompensatorwhichworksuponsystemuninterruptedly,theAWcompensationmethodaffectstheclosed-looppilot-vehiclesystemonlywhentherate-limitingofactuatorisactivated,soitisanovelPIOavoidancemethod.