雷达系统大作业题目.doc

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1、雷达系统大作业一汉译英1.线性调频信号2.二相编码信号3.侦察和监视雷达4.杂波抑制5.恒虚警检测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.RCS2.DPCA3.GMTI4.GMTD5.DiscreteFourierTransform6.in-phaseandquadraturecomponents7.PRF8.Dopplerfrequencyofgroundreturn9.Pulsecompression10.Detectionprobabilityandthefalse-alarmprobability三12选31Thevelocityof

2、theairborneradaris100m/s,thebeamwidthoftheradaris3deg.(constantfordifferentlookdirection),thewavelengthofthetransmittedsignalis0.03m,computetheclutterDopplerbandwidthofthemainbeamforthefollowinglookdirection:(a)0deg(relativetothevelocitydirection);(b)30deg(relativetothevelocitydirection);(c)60deg(re

3、lativetothevelocitydirection);Iftheradarantennaisaphased-arrayantenna,andthebroadsideoftheantennaisparalleltothevelocitydirection,thencomputetheclutterDopplerbandwidthofthemainbeamforthefollowinglookdirection(Assumethatthebeamwidthofthephased-arrayat0degis3deg):(a)0deg(relativetothevelocitydirection

4、);(b)30deg(relativetothevelocitydirection);(c)60deg(relativetothevelocitydirection).2Themoonasaradartargetmaybedescribeasfollowings:averagedistancetothemoonism(about208,000nmi);experimentallymeasuredradarcrosssectionis(meanvalueoverarangeofradarfrequencies);anditsradiusism.(a)Whatistheround-triptime

5、(seconds)ofaradarpulsetothemoonandback?(b)Whatshouldthepulserepetitionfrequency(prf)beinordertohavenorangeambiguities?(c)Forthepurposeofprobingthenatureofthemoon’ssurface,amuchhigherprfcouldbeusedthanthatfoundin(b).Howhighcouldtheprfbeifthepurposeistoobservetheechoesfromthemoon’shalf?(d)Ifanantennaw

6、ithadiameterof60ftandapertureefficiencyof0.6wereusedatafrequencyof430MHzwithareceiverhavingaminimumdetectablesignalofW,whatpeakpowerisrequired?Doesyouranswersurpriseyou；andifso，why?(e)Theradarcrosssectionofasmoothperfectlyconductingsphereofradiusais.Whatwouldbetheradarcrosssectionofthemoonifitwereas

7、pherewithaperfectlysmooth．conductingsurface?Whymightthemeasuredcrosssectionofthemoon(givenabove)bedifferentfromthisvalue?3Aradarmountedonallautomobileistobeusedtodeterminethedistancetoavehicletravelin