简介：Dispersionandnonlineardistortionhaveaneffectontransmissionperformancesofopticalfibertransimissionsystems,Theschemesofdispersioncompensationandnonlineardistortionself-compensationintelecom-CATVco-networktransmissionsystemsarereported,followedbyinvestigationon(1)theimpactofdispersioncompensationfiber(DCF)onfibernonlineareffectswithacascadeoferbium-dopedfiberamplifiers(EDFAs)anddifferentdispersioncompensationschemes,(2)theimpactofthecomplexonthetotalnonlineardistortioninducedbyEDFAgaintiltandthelightsource.Asaresult,dispersioncompensationoptimalschemeandEDFAnegativegaintiltaresuggestedasasolutiontodispersioncompensationoptimalschemeandEDFAnegativegaintiltaresuggestedasasolutiontodispersioncompensationandthenonlineardistortionself-compensation.

简介：Amodifiedblockmatchingalgorithm(BMA)withmotioncorrelationconstraint(MCCBMA)isproposedatfirst.Thenanovelmotioncompensationalgorithm(INTPMC)whichcomputesmotionvectorforeachpixelbyinterpolatingmotionvectorsispresented.Inordertoincreaseinterframepredictionperformanceanddecreasethecomputationalcomplexity,anoptimizingalgorithmforpartialmotionvectorsisdescribedatlast.Experimentalresultsshowthattheproposedalgorithmcanimprovethepredictionperformanceobviouslywithamoderatelyincreasedcomplexitycomparedwiththeconventionalfullsearchblockmatchingalgorithm(FSBMA).

简介：MultiwavelengthchirpedfiberBragggrating(MCFBG)isamorevaluableapproachtochromaticdispersioncompensation.AndadjustingthestructureofFBGwilloptimizetheperformanceofdispersioncompensatorin8×10Gb/sDWDMnetwork,whichisprovedbysimulatingcalculation.

简介：Anadaptiveactuatorfailurecompensationschemeisproposedforattitudetrackingcontrolofspacecraftwithunknowndisturbancesanduncertainactuatorfailures.Anewfeatureofthisadaptivecontrolschemeistheadaptationofthefailurepatternparameterestimates,aswellasthefailuresignalparameterestimates,fordirectadaptiveactuatorfailurecompensation.Basedonanadaptivebacksteppingcontroldesign,theestimatesofthedisturbanceparametersareusedtosolvethedisturbancerejectionproblem.Theunknowndisturbancesarecompensatedcompletelywiththestabilityofthewholeclosed-loopsystem.Theschemeisnotonlyabletoaccommodateuncertainactuatorfailures,butalsorobustagainstunknownexternaldisturbances.Simulationresultsverifythedesiredadaptiveactuatorfailurecompensationperformance.

简介：在有低极化模式的40个Gb/s系统分散(PMD)纤维，一阶的PMD是有相当小的价值的dominate因素。由一个电的极化控制器(PC)组成的一个适应PMD赔偿者，维持纤维(PMF)的极化的节，极化(DOP)的度察觉者和一个反馈控制模块在40Gb/sNSFCNet被采用。这个赔偿者有简单结构和高速度，它能适应地补偿一阶的PMD直到20ps，平均寻找时间是2ms。CLC数字TN929.11

简介：AneffectivemethodisintroducedtocompensatetheeffectsofmutualcouplingfortheEstimationofSignalParameterviaRotationalInvarianceTechniques(ESPRIT)directionfindingalgorithminapplicationofsignalsnapshotarrayprocessing.ChangingthecovariancematrixintoaTeoplitzmatrixcanachievehighresolutionintheDirectionOfArrive(DOA)estimation.Howthemutualcouplingaffectsthearrayantennashasbeendiscussedandanewdefinitionofmutualim-pedancehasbeenusedtocharacterizethemutualcouplingeffectsbetweenthearrayelements.Basedonthenewmutualimpedancematrix,apracticalmethodispresentedtoeliminatetheeffectsofmutualcouplingforESPRITinthesinglesnapshotdataprocessing.Thesimulationresultsshowthat,thisnewmethodnotonlyproperlyreducestheeffectsofmutualcoupling,butalsomaintainsitssteadyperformanceevenforweaksignals.

简介：Anovelsystemconfigurationoffiberopticsensorbasedonopticalabsorptionisproposed.Severalcompensationmeasuresarediscussed.Asimulatedexperimentisdesignedandtheoutputcurveofsystemisgiven.Theexperimentalresultshowsthatthesecompensationmeasuresareeffectiveondynamicdisturbanceswhicharecausedbybackgroundlightandopticalfiberbend,Inaddition,thedriftsinthelightsourceintensity,fiberlosses,andphotodetectorefficiencyareaslocompensated.

简介：Beingdirectedagainettwokinksofnoiseinopticalfibersensors,asim-pleandeffectivemethodofautomaticcompensationforopticalfibersensorsispresented.Notonlytheunstabilityeffectoflightsource,butalsozerodriftofphotoelectronicde-vices,canbeeliminatedorenormouslyrestranedwiththeaidofthismethod.Inanotherway,byusingsingle-chipmrcrocomputer,theopticalfibersensorsystemfabricatediscaonnetedtoacopmuternetworkstorealizeanautomaticcompensation.

简介：Theeffectofsystemmismatchesonanadaptivelinearconstrainedgeneralizedsidelobecanceller(LC-GSC)isdiscussedinthispaper.Basedonthearraygainindex,twoclassicsystemmismatches,thedirectionofarrival(DOA)mismatchandthemismatchesarisingfromarraydisturbance,arestudied,respectively.Toobtaintheeffectivemethodsforcompensatingforthesystemmismatches,weanalyzetheperformanceoftheimprovedLC-GSCwiththediagonalloadingandadditionalconstraints(suchasthedirectionalconstraintsandderivativeconstraints).Thecomputersimulationsshowthatthetechniquesofdiagonalloadingandadditionalconstraintscaneffectivelycompensateforthesystemmismatches.Thelossofarraygainscanbecontrolledwithin3dBinthepresenceof20%ofarraydisturbancesorDOAmismatchwhenthesignal-to-noiseratioislessthan10dB.Theanalysisillustratesthattheproposedcompensationmethodsarevalidandfeasible.

简介：Duetothespecialcharacteristicsoflightinwater,theinformationoftheredchannelisseriouslyattenuatedincollectedimage.Thiscausesothercolorstodominatetheimage.Thispaperproposesanunderwaterimageenhancementalgorithmbasedonredchannelweightedcompensationandgammacorrectionmodel.Firstly,byanalyzingtheattenuationcharacteristicsofRGBchannels,theintensityandtheedgeinformationofredchannelarecompensatedbyweightingtheattenuationcoefficientratiobetweendifferentchannelstocorrectthechromaticity.Thenthegammacorrectionmodelisemployedtostretchtheintensityrangetoenhancethecontrastwhichmakestheimagelookclearer.Theexperimentalresultsshowthattheproposedalgorithmcancorrectthecolorcasteffectandimprovethecontrastbynearly2timesfortheunderwaterimageswithtoomuchredcomponentattenuation.

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简介：极化模式分散(PMD)被认为是在高速度的光纤维通讯系统的最终的限制。证实为适应PMD赔偿的一个有效控制算法是一项挑战性的任务，因为PMD拥有变化时间、统计的性质。粒子群优化(PSO)算法作为反馈控制算法被介绍进自我适应的PMD赔偿。实验结果证明没有在以前从来没在PMD赔偿被完成过的光纤维传播行在本地sub-optima和好坚韧性被套住到噪音，那个基于PSO的控制算法有快速的集中的一些唯一的特征到全球最佳。

简介：A10Gbit/srecirculatingsystemisconfiguredwithChirpedFiberBraggGrating(CFBG)forthedispersioncompensation.Forthefirsttime,thetransmissiondistanceintheloopreaches1000kmwithbiterrorrateof10-9.Theeffectofthegroupdelayrippleofthefibergratingisalsoinvestigatedintherecirculatingsystems,anditisshownthatthetransmissiondistanceislimitedto4cycles(4×167.1km)intheloopwiththepowerpenaltyfluctuationbelow1.0dB.Thusthegroupdelayrippleshouldbereducedtoallowforthewavelengthdriftof±5GHz.Attheendofthisletter,theprinciplesaregivenfordesigninglonghaulrecirculatingsystemswithdispersioncompensationCFBG.

简介：一个有效、灵活的旋转和赔偿计划被设计改进旋转惯性的航行系统(RINS)的精确性。单人赛轴的RINS的精确性被错误在旋转的轴上限制。有为纤维的旋转的轴的错误赔偿的一个新奇惯性的测量单位(IMU)计划眼的旋转罗盘(雾)RINS被介绍。在计划，有类似的错误特征的二对惯性的传感器在旋转斧子上相对地被装补偿传感器错误。没有为旋转周期的任何变化，这个计划改进系统精确和可靠性，并且也为系统提供冗余性。36h航行模拟的结果证明系统的精确性尤其是与正常strapdownINS相比被改进，除出发精确性以外与单人赛轴的RINS相比到3次被增加，并且位置精确性被1个数量级改进。

简介：Thispaperpresentsanewmethodforresynchronizationattack,whichisthecombinationofthedifferentialcryptanalysisandalgebraicattack.Byusingthenewmethodonegetsasystemoflinearequationsorlow-degreeequationsaboutinitialkeys,andthesolutionofthesystemofequationsresultsintherecoveryoftheinitialkeys.Thismethodhasalowercomputationalcomplexityandbetterperformanceofattackincontrasttotheknownmethods.Accordingly,thedesignoftheresynchronizationstreamgeneratorsshouldbereconsideredtomakethemstrongenoughtoavoidourattacks.WhenimplementedtotheToyocrypt,ourmethodgainsthecomputationalcomplexityofO(217),andthatofO(267)forLILI-128.

简介：一根双横梁在红外线附近的分光计被开发在紧张补偿水吸收和仪器的飘移。分光计可以被用于单个、双的横梁大小，并且二个操作模式被比较。结果证明双横梁技术在单个横梁测量消除仪器的飘移，因此，系统的稳定性增加超过20%。水吸收上的双横梁系统的赔偿被胖内容的测量在牛奶验证。结果证明光谱数据比传统的单个横梁模式基于两倍横梁模式得到更好的刻度模型和更低的预言错误。CLC数字TH744.1-TN219-O433.1这个工作被中国(号码2004BA706B12)和天津(No.023800411)的自然科学关键基础的第10五个年计划支持。

简介：Aimingatthehigherbit-rateoccupationofmotionvectorencodingandmoretimeloadoffull-searchingstrategies,amulti-resolutionmotionestimationandcompensationalgorithmbasedonadjacentpredictionofframedifferencewasproposed.Differentialmotiondetectionwasemployedtoimagesequencesandproperthresholdwasadoptedtoidentifytheconnectedregion.Thenthemotionregionwasextractedtocarryoutmotionestimationandmotioncompensationonit.Theexperimentresultsshowthattheencodingefficiencyofmotionvectorispromoted,thecomplexityofmotionestimationisreducedandthequalityofthereconstructionimageatthesamebit-rateasMulti-ResolutionMotionEstimation(MRME)isimproved.

简介：EstimationprecisionofDisplacedPhaseCenterAlgorithm(DPCA)isaffectedbythenumberofdisplacedphasecenterpairs,thebandwidthoftransmittingsignalandmanyotherfactors.DetailedanalysisismadeonDPCA'sestimationprecision.AnalysisresultsshowthatthedirectionalvectorestimationprecisionofDPCAislow,whichwillproduceaccumulatingerrorswhenphasecen-ters'trackisestimated.Becauseofthisreason,DPCAsuffersfromaccumulatingerrorsseriously.Toovercomethisproblem,amethodcombiningDPCAwithSubApertureImageCorrelation(SAIC)ispresented.Largesyntheticapertureisdividedintosub-apertures.Microerrorsinsub-apertureareestimatedbyDPCAandcompensatedtorawechodata.Bulkerrorsbetweensub-aperturesareesti-matedbySAICandcompensateddirectlytosub-apertureimages.Afterthat,sub-apertureimagesaredirectlyusedtogenerateultimateSASimage.Themethodisappliedtothelake-trialdatasetofa20kHzSASprototypesystem.ResultsshowthemethodcansuccessfullyremovetheaccumulatingerrorandproduceabetterSASimage.

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简介：Anewiterativemethodforsignal,restorationhasbeenpresented.AnestimateoperatorW_κwhichisrelatedtoerroroperatorB_κintherestorationprocessisintroducedtodecreasetheestimateerrorandincreasetheconvergencerate.Theeffectofnoiseontheestimateprocesshasalsobeendescribed.Finally,themethodhasbeenappliedtothedeconvolutionofablurredsignal,andtheresultsvalidatethemethod.Acomparisonbetweenthepresentedmethodandthegeneralmethodhasalsobeengiven.