简介:在72届SEG会上,BP公司LindaHodgson等人提出了一种新的噪声压制方法——频率切片滤波(FSF)。在复杂的X-Y频率域中,FSF应用二维平滑滤波器直接去噪。它可以任意选择特定的频率处理范围进行有针对性的滤波,而数据的其余部分不受影响;任何适合于空间滤波的噪声都能够去除,特别是低频噪声的消除和剩余多次波能量的衰减。具体实施过程分为4个步骤:①应用一维快速傅立叶变换到目的层时窗;②检查X-Y频率域数据体,确定频率范围,有针对性地进行噪声衰减;③在每一个频率切片上进行平滑处理,数据的其余部分不改变;④进行傅立叶逆变换,得到滤波结果。以下选取北海2个油田的实例展示其良好的滤波效果。
简介:我们核心之一与使用眼睛的人的计算机相互作用(HCI)系统有关发出的工作地址作为输入凝视。这个问题是在任何眼睛存在的传感器,传播和另外的延期基于追踪者的系统,减少它的表演。延期效果能被眼睛运动轨道的精确预言补偿。这篇论文介绍使用人的视觉系统的解剖性质预言眼睛运动轨道的人的眼睛的一个数学模型。眼睛数学模型被转变成一种Kalman过滤器形式在所有眼睛运动类型期间提供连续眼睛位置信号预言。在这篇论文介绍的模型使用在转变在之间期间采用的大脑茎控制性质快(急束勒马)并且慢(固定,追求)眼睛运动。在这篇论文介绍的结果显示在一种Kalman过滤器形式的建议眼睛模型改进眼睛运动预言的精确性并且能够即时表演。除了HCI,有直接眼睛的系统凝视输入,建议眼睛模型能立即被申请在即时凝视偶然的系统的bit-rate/computational减小。
简介:Formultisensorsystems,whenthemodelparametersandthenoisevariancesareunknown,theconsistentfusedestimatorsofthemodelparametersandnoisevariancesareobtained,basedonthesystemidentificationalgorithm,correlationmethodandleastsquaresfusioncriterion.SubstitutingtheseconsistentestimatorsintotheoptimalweightedmeasurementfusionKalmanfilter,aself-tuningweightedmeasurementfusionKalmanfilterispresented.Usingthedynamicerrorsystemanalysis(DESA)method,theconvergenceoftheself-tuningweightedmeasurementfusionKalmanfilterisproved,i.e.,theself-tuningKalmanfilterconvergestothecorrespondingoptimalKalmanfilterinarealization.Therefore,theself-tuningweightedmeasurementfusionKalmanfilterhasasymptoticglobaloptimality.Onesimulationexamplefora4-sensortargettrackingsystemverifiesitseffectiveness.
简介:Targetdynamicsareassumedtobeknowninmeasuringdigitalspeckledisplacement.Useismadeofasimplemeasurementequation,wheremeasurementnoiserepresentstheeffectofdisturbancesintroducedinmeasurementprocess.Fromtheseassumptions,Kalmanfiltercanbedesignedtoreducevarianceofmeasurementnoise.Anopticalandanalysissystemwassetup,bywhichobjectmotionwithconstantdisplacementandconstantvelocityisexperimentedwithtoverifyvalidityofKalmanfilteringtechniquesforreductionofmeasurementnoisevariance.
简介:这研究检验与一个整体Kalman过滤器(EnKF)联合确定的四维的变化吸收系统(4DVAR)为数据吸收生产一条优异混合途径的性能。当在阻止过滤器分叉利用4DVAR时,从使用州依赖者的不确定性的联合吸收计划(E4DVAR)好处由EnKF提供了:4DVAR分析通过费用的最小化生产以后的最大的可能性答案整体不安关于被转变的功能,和产生整体分析能为下一个吸收周期并且作为整体预报的一个基础向前被宣传。这条联合途径的可行性和有效性与模仿的观察在一个理想化的模型被表明。E4DVAR能够在完美模型、有瑕疵模型的情形下面超过4DVAR和EnKF,这被发现。联合计划的性能比为标准EnKF或4DVAR实现的那些对整体尺寸或吸收窗口长度也不太敏感。
简介:Anewhybridwavelet-Kalmanfiltermethodfortheestimationofdynamicsystemisdeveloped,Usingthismethod,thereal-timemultiscaleestimationofthedynamicsystemisimplemented,andtheobservationequationestablishedisfortheobjectsignalitselfratherthanitswaveletdecomposition.Thesimulationresultsshowthatthismethodcanbeusedtoestimatetheobject'sstateofthestackedsystem,whichisthefoundationofmultiscaledatafusion;besidestheperformanceofthenewalgorithmdevelopedintheletterisalmostoptimal.
简介:在地球中的错误方程修理了的IMU(惯性的测量单位)协调第一被介绍。过滤的褪色的Kalman简单地被介绍,它的缺点被分析,然后,适应过滤在IMU/GPS综合航行系统,适应因素被褪色的因素在代替被使用。一个实际例子被给。当在IMU/GPS综合航行系统适用时,结果证明与褪色的因素相结合的适应过滤器有效、可靠。
简介:Basedonthemulti-sensoroptimalinformationfusioncriterionweightedbymatricesinthelinearminimumvariancesense,usingwhitenoiseestimators,anoptimalfusiondistributedKalmansmootherisgivenfordiscretemulti-channelARMA(autoregressivemovingaverage)signals.Thesmoothingerrorcross-covariancematricesbetweenanytwosensorsaregivenformeasurementnoises.Furthermore,thefusionsmoothergiveshigherprecisionthananylocalsmootherdoes.
简介:TheunscentedKalmanfilterisadevelopedwell-knownmethodfornonlinearmotionestimationandtracking.However,thestandardunscentedKalmanfilterhastheinherentdrawbacks,suchasnumericalinstabilityandmuchmoretimespentoncalculationinpracticalapplications.Inthispaper,wepresentanovelsamplingstrongtrackingnonlinearunscentedKalmanfilter,aimingtoovercomethedifficultyinnonlineareyetracking.Intheaboveproposedfilter,thesimplifiedunscentedtransformsamplingstrategywithn+2sigmapointsleadstothecomputationalefficiency,andsuboptimalfadingfactorofstrongtrackingfilteringisintroducedtoimproverobustnessandaccuracyofeyetracking.ComparedwiththerelatedunscentedKalmanfilterforeyetracking,theproposedfilterhaspotentialadvantagesinrobustness,convergencespeed,andtrackingaccuracy.Thefinalexperimentalresultsshowthevalidityofourmethodforeyetrackingunderrealisticconditions.
简介:Channelfrictionisanimportantparameterinhydraulicanalysis.AchannelfrictionparameterinversionmethodbasedonKalmanFilterwithunknownparametervectorisproposed.Numericalsimulationsindicatethatwhenthenumberofmonitoringstationsexceedsacriticalvalue,thesolutionishardlyaffected.Inaddition,KalmanFilterwithunknownparametervectoriseffectiveonlyatunsteadystate.Forthenonlinearequations,computationsofsensitivitymatricesaretime-costly.Twosimplifiedmeasurescanreducecomputingtime,butnotinfluencetheresults.Oneistoreducesensitivitymatrixanalysistime,theotheristosubstituteforsensitivitymatrix.