地面目标辐射截面的建模与分析

第52卷第18期2007年9月论文2206(,210094.E-mail:[e-mail]),,.,,..2007-06-19,2007-08-31.,.,,,,,.,,[1~5]..,,.(RCS),.,,.,,.,.,.RCS,.1,,T(K).1200~300m[4],2[4].,,().,1200~300m(a)(b)论文第52卷第18期2007年9月(a)(b),(),,,,.2.2.13ΩTΩA,ΩTΩA.2TT/,ARΩ=(1)AT;R.2aMA2BA4,πDηλΩΩηη==(2)ηa;λ;ηA;D;ΩM;ηB.TATaTBTBAA(1),TTTTFTFΩΩΩΩΩ−=⋅+⋅=⋅+⋅−(3)3TTTAAA,ASFASΩΩ===(4)TT;TB;F;ST;SA;AA.,ΔTa,ΔTT:TaaTA.TTΩηΩΔ=Δ(5)ΔTmin,(SNR)1/=NS.ifminrarnN(),2BTKTTBΔ=+(6)Ta;Tm;BN;Bif;Kr[5~8].,-[8]12aTTAmin//.RATTSNηΩ⎡⎤=ΔΔ⎣⎦(7)(7),TT[]ATΔ,1/2TT[].RAT∝Δ(8),TT[]ATΔ.2.2,,TT[]ATΔ,.,(ΔTT)第52卷第18期2007年9月论文2208(AT)TT[]ATΔ,,σ′(radiationcrosssec-tion),TT,ATσ′=⋅Δ(9)m2K,(RCS),.σ′,:()AT,.()ΔTT,,TBT,TTTΔ=−(10)TB,TT.(),,TT11.nniiiiiATσσ==′′==⋅Δ∑∑(11):n,TiA,TiTΔ,iσ′.,,,“”“”.2.3(8),R(ATΔTT)1/2.,,R.,[8].494GHz.,.,3(3cm×6cm,6cm×9cm,9cm×12cm)ATTTΔ.,,,1.413cm×6cm6cm×9cm9cm×12cmAT/cm215.646.893.6ΔTT/K210210210σ′=AT·ΔTT/m2K0.330.981.9730ºΔU/mV84025005000AT/cm282448ΔTT/K164164164σ′=AT·ΔTT/m2K0.130.390.7960ºΔU/mV330100020001,.,.3,.94GHz30°,(1.5m),290K,.MATLAB,5.,TT1niiiATσ=′=⋅Δ∑≈1000m2K.,,6794GHz15m,15°45°.15°45°,2500800m2K.:论文第52卷第18期2007年9月(30º,1.5m)(a);(b)6(15m,15°)(a);(b)7(15m,45°)(a);(b)第52卷第18期2007年9月论文2210(),,,,;();(),,.4,,,8.,,.[]TTATΔ1/10,10dB,R32%.,,RCS,,.8RCS5——,.,.,.(),,()..1StewartWL.Passivemillimeterwaveimagingconsiderationsfortacticalaircraft.IEEEAESSSystMag,2002,12:1115[DOI]2LüthiT,MätzlerC.Stereoscopicpassivemillimeter-waveimagingandranging.IEEETransMicrowTheoryTech,2005,53(8):25942599[DOI]3YujiriL,ShoucriM,MoffaP.Passivemillimeter-waveimaging.IEEEMicrowMag,2003,4(3):3950[DOI]4OlsenR,ClarkS,GallianoJ,etal.Video-ratepassivemillime-ter-waveimager.In:Proceedingsof18thDigitalAvionicsSystemsConference,StLouis,USA,1999.3C113C185KJ,JC,..:,1989.1031236UlabyFT,MooreRK,FungAK.MicrowaveRemoteSensing,ActiveandPassive.Massachusetts:ArtechHouseInc,19817,..:,1995.125,1011058..:,1991.2628