简介：

简介：Withoutassumptionsmadeonmotionstatesofmissileandtarget,anextendeddifferentialgeometricguidancelawisderived.Throughintroducingalineofsightrotationcoordinatesystem,thederivationissimplifiedandhasmoreexplicitphysicalsignificances.Theextendedlawistheoreticallyapplicabletoanyengagementscenarios.Then,onbasisoftheextendedlaw,amodifiedoneisdesignedwithouttherequirementoftargetaccelerationandanapproachisproposedtodeterminingtheapplieddirectionofcommandedmissileacceleration.Qualitativeanalysisiscarriedouttostudythecaptureperformanceandacriterionforcaptureisgiven.Simulationresultsindicatethetwolawsareeffectiveandmakeupthedeficiencythatpureproportionalnavigationsuitableforendoatmosphericinterceptionscannotdealwithhigh-speedmaneuveringtargets.Furthermore,thecorrectnessofthecriterionisvalidated.

简介：Byusingtwo-directionalS-roughsets,theconceptsof(f,f)-interferencegenerationand(f,f)-inter-ferencelawgenerationofknowledge,F-interferencegenerationandF-interferencelawgenerationoftwo-directionalS-roughsetsareproposed.Basedontheconceptsabove,therelationtheoremsbetweenF-interferencelossandF-interferencedegree,therelationtheoremsbetweenF-interferencelosslawandF-interferencedegreelaw,thediscernibilitytheoremsbetweenF-interferenceandF-interferencelawarepresented.Atlast,therecognitioncriterionofF-interferencelawanditsapplicationaregiven.

简介：Aseachtypeofsatellitenetworkhasdifferentlinkfeatures,itsdatatransmissionmustbedesignedbasedonitslinkfeaturestoimprovetheefficiencyofdatatransferring.Thetransmissionofnavigationintegratedservicesinformation(NISI)inaglobalnavigationsatellitesystem(GNSS)withinter-satellitelinks(ISLs)isstudiedbytakingtherealsituationofinter-satellitecommunicationlinksintoaccount.Anon-demandcomputingandbufferingcentralizedroutestrategyisproposedbasedondynamicgroupingandthetopologyevolutionlawoftheGNSSnetworkwithinwhichthesatellitenodesareoperatedinthemannerofdynamicgrouping.Dynamicgroupingisbasedonsatellitesspatialrelationshipsandthegrouproleofthesatellitenodechangesbyturnsduetoitsspatialrelationships.Theroutestrategyprovidessignificantadvantagesofhighefficiency,lowcomplexity,andflexibleconfiguration,bywhichtheestablishedGNSScanpossessthefeaturesandcapabilitiesoffeasibledeployment,efficienttransmission,convenientmanagement,structuralinvulnerabilityandflexibleexpansion.

简介：Aguaranteedcostcontrolproblemforaclassoflineardiscrete-timeswitchedsystemswithnorm-boundeduncertaintiesisconsideredinthisarticle.Thepurposeistoconstructaswitchingruleanddesignastatefeedbackcontrollaw,suchthat,theclosed-loopsystemisasymptoticallystableandtheclosed-loopcostfunctionvalueisnotmorethanaspecifiedupperboundforalladmissibleuncertaintiesundertheconstructedswitchingrule.AsufficientconditionfortheexistenceofguaranteedcostcontrollersandswitchingrulesisderivedbasedontheLyapunovtheorytogetherwiththelinearmatrixinequality(LMI)approach.Furthermore,aconvexoptimizationproblemwithLMIconstraintsisformulatedtoselectthesuboptimalguaranteedcostcontroller.Anumericalexampledemonstratesthevalidityoftheproposeddesignapproach.

简介：Theimpactanglecontroloverguidance(IACG)lawagainststationarytargetsisproposedbyusingfeedbacklinearizationcontrol(FLC)andfinitetimecontrol(FTC).First,thispapertransformsthekinematicsequationofguidancesystemsintothefeedbackablelinearizationmodel,inwhichtheguidancelawisobtainedwithoutconsideringtheimpactangleviaFLC.Forthepurposeofthelineofsight(LOS)angleanditsrateconvergingtothedesiredvalues,thesecond-orderLOSangleisconsideredasadouble-integralsystem.Then,thispaperutilizesFTCtodesignacontrollerwhichcanguaranteethestatesofthedouble-integralsystemconvergingtothedesiredvalues.NumericalsimulationillustratestheperformanceoftheIACG,incontrasttotheexistingguidancelaw.

简介：Inthispaper,anewadaptiveoptimalguidancelawwithimpactangleandseeker’sfield-of-view(FOV)angleconstraintsisproposed.Tothisend,thegeneralizedoptimalguidancelawisderivedfirst.Achangeableimpactangleweighting(IAW)coefficientisintroducedandusedtomodifytheguidancelawtomakeitadaptiveforallguidanceconstraints.Afterintegratingtheclosed-formsolutionoftheguidancecommandwithlinearizedengagementkinematics,theanalyticpredictivemodelsofimpactangleandFOVanglearebuilt,andtheavailablerangeofIAWcorrespondingtoconstraintsiscertain.Next,acalculationschemeispresentedtoacquirethereal-timevalueofIAWduringtheentireguidanceprocess.Whenapplyingtheproposedguidancelaw,theIAWwillkeepsmalltoavoidatrajectoryclimbinguptolimitFOVangleataninitialtimebutwillincreasewiththeclosingtargettoimproveimpactpositionandangleaccuracy,therebyensuringthattheguidancelawcanjuggleordersofguidanceaccuracyandconstraintscontrol.