简介：Themainfunctionofelectronicsupportmeasuresystemistodetectthreatingsignalsinordertotakecountermeasuresagainstthem.Toaccomplishthisobjective,aprocessofassociatingeachinterleavedpulsewithitsemittermustbedone.Thisprocessistermedsortingorde-interleaving.Anovelpointsymmetrybasedradarsorting(PSBRS)algorithmisaddressed.Inordertodealwithallkindsofradarsignals,thesymmetrymeasuredistanceisusedtoclusterpulsesinsteadoftheconventionalEuclideandistance.Thereferencepointsofthesymmetricalclustersareinitializedbythealternativefuzzyc-means(AFCM)algorithmtoamelioratetheeffectsofnoiseandthefalsesorting.Besides,thedensityfiltering(DF)algorithmisproposedtodiscardthenoisepulsesorclutter.Theperformanceofthealgorithmisevaluatedundertheeffectsofnoiseandmissingpulses.IthasbeenobservedthatthePSBRSalgorithmcancopewithalargenumberofnoisepulsesanditiscompletelyindependentofmissingpulses.Finally,PSBRSiscomparedwithsomebenchmarkalgorithms,andthesimulationresultsrevealthefeasibilityandefficiencyofthealgorithm.

简介：Windshearreflectsthatthewindfieldisnotuniform,whichisoneoftheprimaryfactorswhichmaketheretrievalofthewindfielddifficult.Basedonvolumevelocityprocess(VVP)windfieldretrievaltechnique,theintensityofwindshearisidentifiedinthispaper.Afteranalyzingthetraditionaltechniquesthatrelyonthedifferenceofradialvelocitytoidentifywindshear,afixeddifferenceamongradialvelocitiesthatmaycausefalseidentificationinauniformwindfieldwasfound.Becauseofthenon-uniformityinwindshearareas,thedifferenceofretrievedresultsbetweensurroundinganalysisvolumescanbeusedasameasurementtoshowhowstrongthewindshearis.AccordingtotheanalysisofasevereconvectiveweatherprocessthatoccurredinGuangzhou,itcanbefoundthattheareasofwindshearappearedwiththestrengthsignificantlylargerthaninotherregionsandthemagnitudegenerallylargerthan4.5m/(s·km).Besides,bycomparingthevariationofwindshearstrengthduringtheconvection,itcanbefoundthatnewcellswillbemorelikelytogeneratewhenthestrengthisabove3.0m/(s·km).Therefore,theanalysisofstrongwindshear'smovementanddevelopmentishelpfultoforecastingsevereconvections.

简介：Orthogonalfrequencydivisionmultiplexing(OFDM)waveformenablesradarandcommunicationfunctionssimultaneously,whichencounterslowangleresolutionandpoordataratefortraditionalsingleinputsingleoutput(SISO)systems.Tosolvetheseproblems,anintegratedradarandcommunicationsystem(IRCS)withmultipleinputmultipleoutput(MIMO)OFDMwaveformisproposed.Thedifferentlimitationsofradarandcommunicationindesigningsuchasystemareinvestigated.Then,anoptimizationproblemisdevisedtoobtainsuitablesystemparameters,includingthenumberofsubcarriers,subcarrierspacing,numberofsymbols,pulserepetitionfrequency(PRF)andlengthofcyclicprefix(CP).Finally,tosatisfytherequirementsofbothradarandcommunication,theIRCSparametersarederivedinthreetypicalcases.Severalnumericalresultsarepresentedtoillustratethedemandsofradarandcommunication,inconsistentorconsistent,fortheIRCSparametersandthesuperiorityoftheproposedsystem.

简介：与极化单人赛的合成的孔相比，雷达(SAR)想象，完整的测定偏振的SAR图象包含不仅几何、向后散布的特征，而且散布目标的极化特征。因此，测定偏振的SAR在海表面上为油喷洒察觉有更多的优点。作为在油喷洒察觉的关键步，特征抽取直接影响油喷洒辨别的精确性。海油喷洒的测定偏振的特征例如测定偏振的熵，平均散布角度，在完整的测定偏振的SAR图象第一被分析。并且反映在布拉格和镜子的散布信号之间的比例的新测定偏振的参数P被建议。为了为观察multipolarization的油喷洒，系统的比较和分析调查测定偏振的特征的能力，特征根据SIR-C/X-SAR和Radarsat-2获得的完整的测定偏振的SAR图象被提供。在C乐队SAR图象，油流出的实验结果表演能比在L乐队SAR想象在下面的更容易被检测对中等的风速度条件低。而且，它也发现新测定偏振的参数对散布机制的海表面敏感。并且实验结果证明新测定偏振的参数和柱脚高度在C乐队SAR图象为油喷洒察觉比另外的测定偏振的参数更好表现。

简介：在综合评价过程中,Radar图既可以进行可视化定性分析,同时也具有定量分析的能力。针对传统的Radar图综合评价方法进行缺陷分析,并提出三条改进思路：（1）采用Radar图各指标轴之间的夹角大小表示指标的重要程度;（2）简化综合评价函数为特征值分量的几何均值法;（3）采用有序加权的Radar图综合评价方法。改进后的Radar图法评价结果不再受评价者主观取向的影响,评价结果具有唯一性。实例表明Radar图综合评价方法具有可操作性和有效性。

简介：作为由地面生产的数据的数量，为根渗透雷达(GPR)大，传播和数据的存储消费大资源。减轻这个问题，我们这里用混乱粒子群建议一个根成像算法最佳(CPSO)压缩了根据根空间的稀少基于GPR数据察觉到。雷达数据以稀少的方式被分解，观察，测量并且代表，因此根图象能与有限数据被重建。第一，雷达信号测量和稀少的表示被实现，并且解决方案空格被小浪基础和高斯随机矩阵建立；第二，匹配的功能被看作健康功能，并且最好的健康价值被一个PSO算法发现；然后，混乱搜索被用来获得全球最佳的操作员；最后，根图象被最佳的操作符重建。分别地，从美国GSSIGPR的A扫描数据，B扫描数据，和复杂数据在试验性的测试被使用。为B扫描数据，计算时间被减少60?%和PSNR被改进5.539?dB；为实际的根数据成像，重建PSNR是26.300?dB，和全部的计算时间仅仅是67.210?s。CPSO-OMP算法克服本地最佳套住的问题并且包括地在重建期间提高精确。

简介：A2D-directionofarrivalestimation(DOAE)formultiinputandmulti-output(MIMO)radarusingimprovedmultipletemporal-spatialsubspacesinestimatingsignalparametersviarotationalinvariancetechniquesmethod(TS-ESPRIT)isintroduced.InordertorealizetheimprovedTS-ESPRIT,theproposedalgorithmdividestheplanararrayintomultipleuniformsub-planararrayswithcommonreferencepointtogetaunifiedphaseshiftsmeasurementpointforallsub-arrays.TheTS-ESPRITisappliedtoeachsub-arrayseparately,andinthesametimewiththeotherstorealizetheparallellytemporalandspatialprocessing,sothatitreducesthenon-linearityeffectofmodelanddecreasesthecomputationaltime.Then,thetimedifferenceofarrival(TDOA)techniqueisappliedtocombinethemultiplesub-arraysinordertoformtheimprovedTS-ESPRIT.Itisfoundthattheproposedmethodachieveshighaccuracyatalowsignaltonoiseratio(SNR)withlowcomputationalcomplexity,leadingtoenhancementoftheestimatorsperformance.

简介：Datacollectedusingthemicrorainradar(MRR)situatedinJinancity,easternChina,wereusedtoexplorethealtitudinalandtemporalevolutionofrainfallmicrophysicalcharacteristics,andtoanalyzethebrightband(BB)characteristicsandhydrometeorclassification.Specifically,alow-intensityandstablestratiformprecipitationeventthatoccurredfrom0000to0550UTC15February2015andfeaturedaBBwasstudied.Duringthisevent,therainfallintensitywaslessthan2mmh-1ataheightof300m,whichwasabovetheradarsitelevel,sotheerrorscausedbytheverticalairmotioncouldbeignored.ThefreezingheightfromtheradiosondematchedwellwiththetopoftheBBobservedbytheMRR.Itwasalsofoundthatthenumberof0.5–1mmdiameterdropsshowednonoticeablevariationbelowtheBB.Themaximumfallvelocityandthemaximumgradientfallvelocity(GFV)oftheraindropsappearedatthebottomoftheBB.Meanwhile,amethodthatusestheGFVandreflectivitytoidentifythealtitudeandthethicknessoftheBBwasestablished,withwhichtheMRRcanprovideareliableandreal-timeestimationofthe0?Cisotherm.ThedropletfallvelocitywasusedtoclassifythetypesofsnowcrystalsabovetheBB.Inthefirst20minoftheselectedprecipitationevent,graupelprevailedabovetheBB;andatanaltitudeof2000m,graupelalsodominatedinthefirst250min.After150min,theexistenceofgraupelanddendriticcrystalswithwaterdropletsabovetheBBwasinferred.

简介：Nyquistfoldingreceiver(NYFR)isatypicalwidebandanalog-to-informationarchitecture.Focusingonthenoncooperativereceiving,thepulseradarsignalinterceptedbytheNYFRintimedomainisanalyzed.TheNYFRoutputsunderdifferentinputconditionsareinvestigatedbasedontheextendedFouriertransform(EFT)andthesamplingtheorem.CombiningwiththecharacteristicoftheNYFRoutputintimedomain,anewtimeofarrival(TOA)estimationmethodbasedontheenergyenvelopeandthewavelettransformisproposed.Theproposedestimationmethodcanbeadaptedforthenon-cooperativesituation.Ithasnorequirementforpriorinformationtodeterminethethresholdandisnotnecessarytotransformthesignalintobaseband.SimulationresultsprovethecorrectnessoftheNYFRoutputexpressionsandshowtheefficacyoftheproposedestimationmethod.

简介：这份报纸在海洋动力学介绍吸收技术当模特儿并且讨论转换的可行性在由吸收单个车站HF检测的光线的速度扎根了的海水流的察觉地区的海表面水流在海洋动力学的波浪雷达模型。基于伴随吸收和POM模型，纸成功地转换通过单个车站HF的海表面水流磨擦了在Zhoushan海的波浪雷达区域。单个车站HF雷达倒置结果也与bistatic相比合成结果和固定的点测量了的HF雷达由Annderaa电流结果米。错误分析证明从单个车站HF雷达的速度和流动方向数据基于伴随吸收和POM建模的流动的获得是可行的，数据获得有高度与流动域的关联和一致性由HF观察了雷达。