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简介:Arithmeticcodingisarelativelynewloss-lessdatacompressiontechniquethathasattractedmuchattentioninrecentyears.Weshowtheiterationofbit-levelarithmeticcodingcanbespecifiedbyacontinuousfunction.Theanalysisexpressionandsomepropertiesofthisfunctionarediscussed.Anapplicationofthefunctionisprovidedforexploringthesecurityofarithmeticcodeswhentheyareusedfordataencryption.
简介:Advantagesofdieselenginecontrolusingin-cylinderpressureinformationforclosed-loopcontrol.Analogcontrolsystemcomponents.Applicationoflasercollimationtechnologyinlargecurvedsurfacemachining.Areneuralnetworktechniquesthesolutiontomeasurementvalidation,monitoringandautomaticdiagnosisofsensorfaults?Artificialneuralnetwork-basedcontrolsystems.
简介:地震当(SWD)钻是新兴的地上凿穿时把downhole练习小点颤动用作地震的地震成像技术采购原料。没有打断钻,SWD技术能在小点前做岩石形成的在即时附近的图象并且优化钻操作,与费用的减小和钻的风险。然而,到表面SWD数据的噪音比率(SNR)的信号为SWD数据的表面获得是严重地低的。这里,我们建议一个新方法从一连串的宽带测震表记录的表面数据检索练习小点信号。利用wavefield分析,噪音的不同类型被识别并且从表面SWD数据搬迁了,导致SNR的重要改进。我们最佳地也综合位来源的地震反应,用统计跨连贯的分析指导然后被用来证实一个反向的垂直地震侧面(RVSP)数据为连续的钻深度设定的到达和思考进一步改进SNR并且两个都检索练习小点。从这些数据导出的表面下的图象与三尺寸的表面的相应图象作比较很好地震调查十字很好。
简介:Currently,1bitor2bitsignalquantizationiswidelyusedinsatellitenavigationsoftwarereceivers.Thebit-wiseparallelalgorithmhasbeenproposedfor1bitand2bitsignalquantization,whichperformscorrelationwithhighefficiency.Inordertoimprovetheperformanceofthecorrelator,thispaperproposesanew1.5bitquantizationmethod.Theoreticalanalysesaremadefromtheaspectsofcomplexityandquantizationloss,andperformancecomparisonbetween1.5bitquantizationcorrelatorandtraditionalcorrelatorsisdiscussed.Theresultsshowthatthe1.5bitquantizationalgorithmcansaveabout30percentcomplexityundersimilarquantizationloss,reducemorethan0.5dBsignalnoiseratio(SNR)lossundersimilarcomplexity.Itshowsgreatperformanceimprovementforcorrelatorsofsatellitenavigationsoftwarereceivers.