卫星通信—第四讲-链路计算

EIRPC/NG/T•24RPFtp=:R:tPhFAPr=)(2mW(W):hA)(2m,,,tGrG24RGPFttp=)(2mW2244⎟⎠⎞⎜⎝⎛==RGGPRAGPPrttttrplphηλπ=24AGr•()frttrfLGGPPcfRRL=⎟⎠⎞⎜⎝⎛=⎟⎠⎞⎜⎝⎛=2244plp()d(m),,[]llg20lg2022-+=dLf)(ml(dB)d(m),f(GHz)[]fdLflg20lg2045.92++=(dB):6GHz,4GHz,d40000,:[][][]53.19652.305.20064lg2005.20056.1504.9245.92=-=+==++=ufdfufLLL(dB)(dB)•EIRP(EffectiveIsotropicRadiatedPower))()()(dBGdBwPdBwEIRPGPEIRPttt+==(W)•C/N,,C/T0nCWkTPWAkTAPNCsrsr==AsTFMPSK,,C/N.kTNCNnCNC==0T0n)dBHz(B)HzKwdB(6.228)KdBw(TC)dBHz(B)dBHz(nC)dB(NC0+⋅+=-=•G/Tsr2tt2srttsrTGR4kWGPR4WkTGGPWkTPNC⎥⎦⎤⎢⎣⎡πλ=⎥⎦⎤⎢⎣⎡πλ==NCsrTG,G/T.•,,...INTELSATG/T.A(6/4)B(6/4)C(14/11)D(6/4)D-1D-2E(14/11)F(6/4)F-1F-2F-3≥+≥+≥TGfTGfTG4lg207.314lg200.3515-1811--144lg207.314lg207.22fTGfTG+≥+≥5114lg200.294lg200.274lg207.22fTGfTGfTG+≥+≥+≥4.5--57.5--89--10QualityGradeImpairmentWeightedS/NExcellent5Imperceptible48.0dBGood4Perceptiblebutnotannoying42.0dBFair3Slightlyannoying38.0dBPoor2Annoying34.0dBBad1Veryannoying30.0dB)()()()(dBLdBGdBWEIRPdBWPfrr-+=•:•La•LdeLdi•LTr•LppTrdideafrrLLLLLLGEIRPdBWP------+=)(•,••••,:(,)=43.12148.0mvff(GHz),νm(m)Vm50m50Vm200m200Vm500m••LdeLdi••5o:,(),()=TrLTrL)()0(qGG=())(qG)0(Gq)(qG22177.2)0()(⎟⎟⎠⎞⎜⎜⎝⎛-⋅≈qqqeGG22177.2⎟⎟⎠⎞⎜⎜⎝⎛≈qqeLTr21qf=4GHz,10mo21525.0D70=λ≈θ0.04odB4.0106.1eL2)525.004.0(27.2Tr=≈=•:[]⎥⎥⎦⎤⎢⎢⎣⎡++--+±+-=)1)(1(2cos)1)(1(4121lg102222RTRTRTPxxxxxxLa.TxRx•:[])lg(cos102a-=PLaα•••••••••LNARFGmGIFG+RFG+RFTinTLNAmTmG+IFTIFGnP•B,N=kTB•TeN=kTeBnWTTkGGGWkTGGWkTGPinRFRFmIFmmIFIFIFn)(+++=⎟⎟⎠⎞⎜⎜⎝⎛+++=IFmIFRFminRFRFmIFGGTGTTTkWGGGRFIFmGGGnPsTRFmIFRFmRFinssRFmIFnGGTGTTTTWkTGGGP+++==inT4GHzinT=50KRFTmTmGRFGIFTIFG=50K=500K=1000K=23dB=0dB=30dBKTs5.10720010002005005050=+++=LNA.PL)11(PPlLTT-=PTLNA)11(PPPainLTLTT-+=dBLP2=KTa50=KTP290=K8.1383.1075.31Tin=+=,,0.1dB,7K.KTs3.196=:::::0eTATWk=(Hz)(290K))(6.228)(1038.123kdBwksw-=⋅×-)1(0-=NFTTeNF==0001TTWAkTWAkTWAkTee+=+=qT(MHz)(K)000,10000,3000,16003002001004455556101.1105.6106.3106.4107109101××××××ו102~104K:LTG108.4Tq_6as-×=()_LG[]dBGi53=qT1,EIRP.2,,.1srttTGRKWGPNC24⎥⎦⎤⎢⎣⎡=plEDSSDEDSSDEDSSDTGLEIRPTCTGLEIRPNCWTGLEIRPNC⎟⎠⎞⎜⎝⎛+-=⎟⎠⎞⎜⎝⎛+⎟⎠⎞⎜⎝⎛+-=⎟⎟⎠⎞⎜⎜⎝⎛-+⎟⎠⎞⎜⎝⎛+-=⎟⎠⎞⎜⎝⎛1116.228lg106.22802:BOiBOooSSMSEDMSDBOEIRPEIRPWTGLEIRPNC-=-+⎟⎠⎞⎜⎝⎛+-=⎟⎠⎞⎜⎝⎛,,,lg106.2283,.CCIR(Rec.358-3Rep387-4,CCIR,VolIV/IX-2,1982),.1SUSEUSSUSUSEUTGLEIRPTCWTGFNCWTGLEIRPNC⎟⎠⎞⎜⎝⎛+-=⎟⎠⎞⎜⎝⎛-+⎟⎠⎞⎜⎝⎛+-=⎟⎠⎞⎜⎝⎛-+⎟⎠⎞⎜⎝⎛+-=⎟⎠⎞⎜⎝⎛,2,lg106.2284lg10lg106.228lp2WTGBOFNCWTGLBOEIRPNCWTGLEIRPNCSiSUSUiSEUSUMEUlg106.2284lg10lg106.228lg106.2282,,-+⎟⎠⎞⎜⎝⎛+-⎟⎟⎠⎞⎜⎜⎝⎛-=⎟⎠⎞⎜⎝⎛-+⎟⎠⎞⎜⎝⎛+--=⎟⎠⎞⎜⎝⎛-+⎟⎠⎞⎜⎝⎛+-=⎟⎠⎞⎜⎝⎛lp11111111--------⎟⎠⎞⎜⎝⎛+⎟⎠⎞⎜⎝⎛+⎟⎠⎞⎜⎝⎛=⎟⎠⎞⎜⎝⎛⎟⎠⎞⎜⎝⎛+⎟⎠⎞⎜⎝⎛+⎟⎠⎞⎜⎝⎛=⎟⎠⎞⎜⎝⎛IDUTIDUTTCTCTCTCNCNCNCNCINC⎟⎠⎞⎜⎝⎛:--()----,()--1,...thNC⎟⎠⎞⎜⎝⎛2,...DNC⎟⎠⎞⎜⎝⎛UNC⎟⎠⎞⎜⎝⎛DNC⎟⎠⎞⎜⎝⎛mNCD1⋅⎟⎠⎞⎜⎝⎛1111lg10lg10----⎟⎠⎞⎜⎝⎛⎪⎭⎪⎬⎫⎪⎩⎪⎨⎧⎟⎠⎞⎜⎝⎛-⎟⎠⎞⎜⎝⎛-⎟⎠⎞⎜⎝⎛==NCNCNCNCmMDTth3.4(EIRPF),,..,(3dB).10.SFD[][][]⎟⎟⎠⎞⎜⎜⎝⎛+-=⋅24lg10lpusesLEIRPSFD[]seEIRP⋅[]uLSFD,[]seEIRP⋅[][][]⎟⎠⎞⎜⎝⎛λπ-+=⋅2usse4lg10LSFDEIRP[][][][][][]OPBOEIRPEIRPIPBOSFDFDS-=-=SFD(SaturatedFluxDensity)SFD•Ku-4.5••512Kbps•BPSK•FEC1/2•10-7•Eb/N06dB•99.9%•2.4EIRPdBWG/T(dB/K)SFD(dBW/m2)(dB)•1.5-87.5•49.76.8•42.81.4SFDdBW/m2-87.5-87.5dB44.544.5IPBOdB6.06.0IPBOdB25.525.5EIRPdBW50.450.4dB207.8207.8dB0.00.0G/TdB/K1.51.5[C/N]udB11.811.8[C/Iim]udB18.618.6[C/Ix-pol]udB19.819.8[C/IAdj]udB17.017.0[C/ITer]udB60.060.0[C/(N+I)]udB9.69.6:EIRP(dBW)42.842.849.749.7OPBOdB3.03.03.03.0OPBOdB22.522.522.522.5EIRPdBW20.320.327.227.2dB206.5206.5206.5206.5dB0.01.40.06.8G/TdB/K25.924.325.922.4[C/N]ddB7.54.414.34.0[C/Iim]ddB10.910.910.910.9[C/Ix-pol]ddB20.820.520.820.5[C/IAdj]ddB27.027.027.027.0[C/ITer]ddB6060.06060[C/(N+I)]ddB5.73.49.03.2[C/(N+I)]TotaldB4.202.476.302.30[C/(N+I)]thdB2.202.202.202.20dB2.000.274.100.10%1.13%2.76