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1、TheMetricationofLowProbabilityofInterceptWaveformsC.FanceyC.M.AlabasterCanadianNavyDept.Informatics&Sensor,CranfieldUniversityCFBEsquimaltShrivenhamEsquimalt,BritishColumbia,CanadaOxon,UK,SN68LAcam_fancey@hotmail.coomc.m.alabaster@cranfield.ac.ukI.INTRODUCTI
2、ONThemetricusedtoquantifytheLPIperformanceofwaveformsisbasedonstatisticalquantitiesdescribingtheInrecentyears,militaryradaroperatorshavebeenspectralpowerdensityofeachwaveform.Thespectrumwasconcernedthatthetransmittedradarsignalswillbeaconthederivedusinganumb
3、erofcloselyspacedfrequencysamples.presenceoftheradartoanenemy.Ifintercepted,theradarTwospectraaregiveninFigure1whichillustratesthesignalsalertatargettoanattackwhichcouldpromptevasiveproblemofquantifyingtheirLPIqualities.measuresorcountermeasurestobetakenbyth
4、etargetincludingthepossibilityofareprisalattackusingananti-radiationmissile.Furthermore,interceptedsignalscandivulgeoperatingparametersoftheradartotheenemy.Inresponsetothislowprobabilityofintercept(LPI)requirement,waveformshavebeendesignedtominimizetheprobab
5、ilityofinterceptbyanenemyreceiver.Thesearelargelybasedontheuseoflowpeakpowersandspreadspectrumwaveformsofferinglargeprocessinggains.Theinterceptionofsignalsisafunctionofboththetransmittedradarwaveformandtheinterceptreceiver.Theaimofthisworkistodeduceametricw
6、hichmaybeusedtoquantifyandhencecomparehow“discrete”manyofthecommonlyusedLPIradarwaveformsactuallyare.ThisstudyconsidersthefollowingLPIwaveforms[1]:LinearFrequencyModulation(LFM),SinusoidalFrequencyModulation(SinFM),Poly-PhaseShiftKeying(PPSK)techniquesinclud
7、ingFrank,P1,P2,P3,andP4codesCostascodeFrequencyShiftKeyingFigure1-PowerSpectraofTwoWaveforms.(FSK),andCostas-BarkerHybrid(FSK/PSK).ThisworkrepresentsthefirstattempttobepublishedintheopenliteraturetoquantifytheLPIpropertiesoftransmittedradarwaveforms.Securewa
8、veformcodingstrategiestominimizeIfthepeakspectralpowerofthewaveformaloneistheriskofdivulgingradarcapabilitiesisknownaslowconsidered,thenclearlywaveformB,withitspeakpowerprobabilityofexploitation
