雷达系统大作业题目文档格式.docx
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雷达系统大作业题目文档格式.docx
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6.合成孔径雷达
7.干涉合成孔径雷达
8.匹配滤波
9.脉冲压缩
10.多普勒滤波器组
二英译汉
1.RCS
2.DPCA
3.GMTI
4.GMTD
5.DiscreteFourierTransform
6.in-phaseandquadraturecomponents
7.PRF
8.Dopplerfrequencyofgroundreturn
9.Pulsecompression
10.Detectionprobabilityandthefalse-alarmprobability
三12选3
1
Thevelocityoftheairborneradaris100m/s,thebeamwidthoftheradaris3deg.(constantfordifferentlookdirection),thewavelengthofthetransmittedsignalis0.03m,computetheclutterDopplerbandwidthofthemainbeamforthefollowinglookdirection:
(a)0deg(relativetothevelocitydirection);
(b)30deg(relativetothevelocitydirection);
(c)60deg(relativetothevelocitydirection);
Iftheradarantennaisaphased-arrayantenna,andthebroadsideoftheantennaisparalleltothevelocitydirection,thencomputetheclutterDopplerbandwidthofthemainbeamforthefollowinglookdirection(Assumethatthebeamwidthofthephased-arrayat0degis3deg):
(c)60deg(relativetothevelocitydirection).
2
Themoonasaradartargetmaybedescribeasfollowings:
averagedistancetothemoonism(about208,000nmi);
experimentallymeasuredradarcrosssectionis(meanvalueoverarangeofradarfrequencies);
anditsradiusism.
(a)Whatistheround-triptime(seconds)ofaradarpulsetothemoonandback?
(b)Whatshouldthepulserepetitionfrequency(prf)beinordertohavenorangeambiguities?
(c)Forthepurposeofprobingthenatureofthemoon’ssurface,amuchhigherprfcouldbeusedthanthatfoundin(b).Howhighcouldtheprfbeifthepurposeistoobservetheechoesfromthemoon’shalf?
(d)Ifanantennawithadiameterof60ftandapertureefficiencyof0.6wereusedatafrequencyof430MHzwithareceiverhavingaminimumdetectablesignalofW,whatpeakpowerisrequired?
Doesyouranswersurpriseyou;
andifso,why?
(e)Theradarcrosssectionofasmoothperfectlyconductingsphereofradiusais.Whatwouldbetheradarcrosssectionofthemoonifitwereaspherewithaperfectlysmooth.conductingsurface?
Whymightthemeasuredcrosssectionofthemoon(givenabove)bedifferentfromthisvalue?
3
Aradarmountedonallautomobileistobeusedtodeterminethedistancetoavehicletravelingdirectlyinfrontofit.Theradaroperatesatafrequencyof9375MHz(Xband)withapulsewidthofl0ns(s).Themaximumrangeistobe500ft.
(a)Whatisthepulserepetitionfrequencythatcorrespondstoarangeof500ft?
(b)Whatistherangeresolution(meters)?
(c)Iftheantennabeamwidthwere.whatwouldbethecross-rangeresolution(meters)atarangeof500ft?
Doyouthinkthisvalueofcross-rangeresolutionissufficient?
(d)Iftheantennadimensionswere1ftby1ftandtheantennaefficiencywere0.6,whatwouldbetheantennagain(dB)?
(e)Findtheaveragepowerrequiredtodetecta10radarcrosssectionvehicleatarangeof500ft,iftheminimumdetectablesignalisW.
4
(a)Whatsignal-to-noiseratioisrequiredforaradarthatmakesadetectiononthebasisofasinglepulse,whentheprobabilityofdetectionis0.50andtheprobabilityoffalsealarmis?
Assumeanonfluctuatingtargetecho.
(b)Repeatfora0.99probabilityofdetectionandthesameprobabilityoffalsealarm.
(c)Repeatparts(a)and(b),butforaSwerlingCase1fluctuatingtarget.
(d)Compareyourresultsinatable.Whatconclusionscanyouobtainfromthis?
5
Acivilmarineradarisemployedonboatsandshipsforobservingnavigationbuoys,detectingland-seaboundaries,piloting,andavoidingcollisions.Considerthefollowingcivil-marineradar:
Frequency:
9400MHz(Xband)
Antenna:
horizontalbeamwidth=
Verticalbeamwidth=
Gain=33dB
Azimuthrotationrate=20rpm
Peakpower:
25kW
Pulsewidth:
0.15μs
Pulserepetitionrate:
4000Hz
Receivernoisefigure:
5dB
Receiverbandwidth:
15MHz
Systemlosses:
12dB
Averagetimebetweenfalsealarms:
4hours
(a)Plotthesingle-scanprobabilityofdetectionasfunctionofrange(nmi),assumingaconstantcross-sectiontargetof10(anavigationbuoy)andfree-spacepropagation.[Youwillfinditeasiertoselecttheprobabilityofdetectionandfindthecorrespondingsingle-to-noiseratio,ratherthanthereverse.Youneedonlyconsiderprobabilitiesofdetectionfrom0.30to0.99.Youmay,forpurposesofthisproblem,selectasingle(average)valueoftheintegrationimprovementfactorratherthantrytofinditasafunctionof(sincethecurveinthetextdoesnotpermitotherwise).]
(b)Repeat(a)foraSwerlingCase1targetfluctuationmodelwithaveragecrosssectionof10.Plotonthesamediagramas(a).
(c)Commentonwhethertheaveragepowerofthisradaristoolow,justright,ortoohighforthejobi
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