无线电信息接收机

1、无线电信息接收机发展动态无线电信息接收机发展动态1无线信道的基本特性无线信道的基本特性2无线接收机设计无线接收机设计3无线接收机中的部件无线接收机中的部件4无线接收机最新进展无线接收机最新进展5软件无线电发展动态软件无线电发展动态1数字中频技术数字中频技术2零中频技术零中频技术3案例分析案例分析4 ： lgRSSIKALR 无线信道基本特性无线信道基本特性1无线信道非线性效应无线信道非线性效应2案例分析案例分析3h(, t) s(t)r(t)n(t)21 hh 3/421一般取值为等效地球半径因子折射率随高度的变化率实际地球半径等效地球半径其中：KKdhdnRRdhdnRRKRRee为收发之间

2、的距离。为收发天线高度，其中：dhhdhhmmEEtr212/1212,22cos21为衰落深度频率、距离有关，分别和、关的因子，表示和地形、气候有其中：010/0/lg10)()(10)()(/PPFdNfMdNfMPPUrFr10/10FCBdfQAU0)(cmT0)( fcfmcTf1)(0;21*0;212121);();(21);,()(ttccttctcEtdeffjcC2)()(0t)( tCdcBt1)(t0)(CSdBct)(0*0);();(21);()(ffCCttfCtfCEtfttdetStjCC2)()(的正态随机变量表示标准偏差为为路径损耗指数，其中：XnXddn

3、dPLdBPL)log(10)()(00),()()(thtxty51501ccBB或，/vfmmcmcmcfTfTfT423. 0169,1或，或0, 00),2exp()(222rrrrrp。为特定电平的归一化值其中：,22efNmR212mfe)()exp()()exp()(2211tjtjthb( )( )cos( )sinRe( )( )Re ( )cccIcQcjtjtIQjts ts ttstts t ejst es t e ( )Re ( )cjtr tr t en t 8226F2223 23 10()350 10L =-10log=-10log=83.3dB(4) d(4)

4、(1 10 )muA(350MHz(1km)16dBAREAG3dBteteh30G(h )=20log()=20log()=-46dB200200rereh1.7G(h )=10log()=10log()=-2.5dB3350FmutereAREAL (dB)=L +A(f,d)-G(h )-G(h )-G=83.3dB+16dB-(-46dB)-(-2.5dB)-3dB=144.8dBr50rP (d)=EIPR(dBm)-L (dB)+G (dB)=30dBm-144.8dB+2dB=-112.8dBmS=-174+5+10lg(10103)+10=-119dBm接收机指标分析及测试接收

5、机指标分析及测试1案例分析案例分析3高线性动态接收机设计方法高线性动态接收机设计方法224nVkTBR1010dBm10log10logAPkTB1ooiiNSNSF输出端信噪比输入端信噪比oiNFGNdBdBdBoiNNFGNiNkTB1aoNNGkTBFGkTBoNFGkTB2121121211ooNNFFFG kTBGG kTBG312111212111nnFFFFFGGGGGGminSNPDkTF B231.38 10J/Kmin17410lg10lg10lg(dBm)SNPDFB ,111dBin dBdBPPG31 2sinIPRP 3323IPPIMin17110lg10lgNM

6、DSFB 332uMSDPIP3123uPMDSIPL310210log171 dBm3uSFDRPPIPNFB RF1dBDRPMDS |( ,1,2,)pqLsIfpfqffF p q 1sIpffqpIKLpfffqq0,1pqKIff1,1pqKLIfffLfKfsfIfIff镜像干扰本振信号有用信号 33244cos33()cos22iiiLLSLSiiIta Va VVa V Vt 001120022(cos1cos)cos2sSSSksif Vf V mtfV V mtt 2002201122011cos2cos12SkfSkfV V mtKf V mtmfVmf干扰信号所转移的

7、调制有用信号调制 121212122121221221coscoscos()cos() 3cos(2)43cos(2)4ssssssssssssssssiftftf V VttfV VtfV Vt .3121)0(332210 2 vavavaavfvfvffiReceiverGainAGCPin(dBm)0-20-60-40-80-100-120Pout(dBm)0-5-15-10-20高高增增益益低增益输入动态范围输输出出动动态态范范围围输入信号功率基基带带处处理理CaVeKP1CaVioeKVV121lnVaV22( )()( )(ln)crroVF s VVF s VK VicoVKa

8、VV1lnlniocVKVaV1lnln21ln)(ln)(ln)(1 lnKsaFKVsaFVsaFVriorioVsaFVsaFV)(ln)(1 lnooVV10log3 . 2lnoooVVV115. 0203 . 2ln)(1)(7 . 8)(1saFVsaFsaFeerio)0(1aFeeio1/)(BsKsFaKeeio1aKaKVaKeerio1655. 811)1 (11aKBsBsaKeeioMLaKB)1 (aCsaVaCssseserio6 . 8)()(CVterot6 . 8)(limFVVVorc)(iiiiiodVdPVPPVdVddVdV)(iociooccic

9、cidVdVFdVdPdVdVdVdVdVdPdVdVdVdPdVdP)(PdVdPFVdVdVciio)1 (1)1 (ciiioodVdPFVVdVVdVcidVdPVsFL)(iVsKLssVViii)(iiooKVssVV)(tKViooietVV)(TRVVsceII/ToVVscsiieIIRVI/ssiToIRVVVln VGA可变增益放大器可变增益放大器AGC设计设计VGA可变增益放大器可变增益放大器dBNNS12)(系统线性度指标系统线性度指标11112,123.1.ninnGGGGGIPIPIPIPIPLGIPIPin,3系统总噪声系数计算及灵敏度指标系统总噪声系数计算及灵

10、敏度指标321112121111.nnFFFFFGGGGGGMDSPdBDRdBin1 ,)(3210log171953SFDRIPNFBdBmdB3211200.02792MHzHzF FE ET TF FE ET T输输入入匹匹配配输输入入匹匹配配输输入入匹匹配配输输入入匹匹配配R RF F 输输入入N NF F= =1 1. .2 2d dB B; ;I IP P3 3= =+ +4 42 2d dB Bm mG G= =1 18 8d dB B ; ;P P1 1d dB B= =+ +2 23 3d dB Bm m F FE ET T参参数数: :前端预选器与系统中的滤波器实现前端预

11、选器与系统中的滤波器实现图图6 6- -5 5 预选器滤波器组结构预选器滤波器组结构2-3MHz3-5MHz5-8MHz8-13MHz20-30MHz13-20MHz单刀六掷开关单刀六掷开关HITTITEHITTITE公司公司HMCHMC252252QSQS2424DCDC3 3GHzGHzL L0 0. .8 8dBdBIPIP3 34646dBmdBmDDSDDS2 2TXCOTXCO120120MHZMHZDDSDDS1 1MCUMCUFcFc= =4040MHzMHz* *2 2倍频器倍频器FoFo= =6565MHzMHzBWBW= =1515MHzMHzAMPAMP. .衰减器衰减

12、器LoLo. .1 1 + +1010dBmdBmstepstep= =1010KHzKHz5050. .8 87878. .8 8MHzMHz2525. .4 43939. .9 9MHzMHz衰减器衰减器AMPAMP. .FcFc= =4040MHzMHzLoLo. .2 2 + +1010dBmdBmstepstep= =1 11010HzHzfofo= =3838. .1 1MHzMHzTXCOTXCO1010. .245245MHZMHZAMPAMP. .衰减器衰减器LoLo. .3 3 + +1010dBmdBmfofo= =1010. .245245MHzMHz混频器设计混频器设

13、计1LNA和限幅器设计和限幅器设计2VGA设计设计3对数中放设计对数中放设计4AFC设计设计6案例分析案例分析8单脉冲雷达接收机单脉冲雷达接收机7AGC设计设计522minoptopt()()nsssRFFGGBBG2minopt1212uncnccnGFRGGRGGR optcBB 2optucnGGGR222112212212111221222122111211SSkSSSSSSSS11221221S SS S2minoptnssRFFYYG2minoptnssGFFZZRoptopt0opt11YY2soptmin220sopt411nRFFZ1221in11221LLS SSS1221

14、out22111SSS SSS*12211111222211LLSLLS SSSSS *12212222111111SSLSLS SSSSS 2*111MS1111422CBBCCC*11122CSS222122111SSB 2*222ML2221422CBBCCC*22211CSS222211221SSB ML1221*MS11ML221S SSSMS1221*ML22MS111S SSSo11o1inLVKVVVin1iain1ia()()VVVVoinlgVkVini1omLVK VVmVini11lglgVmKVinoi1lglgLVVVKVoininoooioinoilg()()aa

15、abbVKVVVVVVVVVViniiainiiniabbVVVVVVVoin/1ddadKKKVVKiniiiniiniaabbVVVVVVV1ininaV KV1inoooilg()naaaV KVVVV2ininaV KV2inooilg()naaaV KVVV2inoinoiooooi()lg()()nbbaabaaV KVVVVVVVVV3inoooooilg()2()naabaaV KVVVVVVinoooooilg()(1)()n maabaaV KVVVmVVV21oinininin21in()()nnDnnDVKKVK VKVK VK VKKKKi1o1221/1111()n

16、LDLDLnnVVKVK VK VKKKK1i2o122/1112()nLDLDLnVVKVK VK VKKK1io12/111()n mmLDLDLn mVVKVmK VK VKKKinon/LDLVVKVnK V1i1lg()lgnmLV KmKV1io2111lg()()lgnmDLmn mLV KK VVKVKKK1inini1/nLnLVVKDRKVVK111dtB1dtLC LC1/ddLCttnWLRCoHioiL(1)1VKVVVV iLHiLH/VVKVVKoHiL(1)n mVKVmVLHi11H/(1)nVKVKLo1LHVVVKLHi2Hi12H/(1)(1)nVKVK

17、VKLo2Lo1LH2VVVVVK1LHiHi1H/(1)(1)mmn mVKVKVKLoLo1LH(1)mVVmVVmVK1LiHi1H(1)nnVVKVKLoLo1LH(1)nVVnVVnVKLi1HH1H(1)(1)nniVVKKVKLo1Lo1LH(1)nVVnVVmVKiHi111lg()lg(1)mVmKV iLoo1Hi1lg()lg(1)mmVVVVKVLHLi11HH/(1)(1)nnVKVVKKLo1LLHVVVVKi1Hi1L(1)nnVKVVo1o1LL(1)nVVnVnVin 1inHi1(1)nVDRKV1inHH1(dB)20lg(1)20lgnDRKKnH1Ko

18、1Loo1L(1)1nVnVDRnVV1iHi1(1)mxVKV 1oHi1L(1)mxeVKVmV 1LoHo1HLLLHLHlg(1)lg(1)(1)1mxeVVKVKVmx VVKVmxK 1oooHi1LH1(1)()mxetVVVKVVxK Li1H/11lglg(1)lg(1)HVVxmKK od()0dVxHomaxLHHH111lglg(1)lg(1)KVVKKKHomaxHHHmaxHoHHH111lglg(1)lg(1)11lglg(1)lg(1)tKVKKKKVmKKK442OACEIII L14222OAPOAPIVRIR44e4C mCPPVIRI P e4ibee4

19、2( 56)1mIVrIRR ie4be2/(1)56mVIrRRi4be2/(1)5mPC mV RVrR4Hibe2/(1)5C mPmVRKVrRbe12(/(1)2)PLRKrRe2o1L2nPIVVRoe22EIIe22oBII22DEke22d/d2DEeke21 1eAe2DDEkeE2ddDEke1eCaVpGKoi1eCaVVV K21lnVaV 222olnlnCrrrVF sVVF sVaVF sVaK Vo1io1ilnlnlnlnCCVaVKVaVVKV 22oi12ln1lnlnrVa F sVKa F s KaF s V212lnKa K010oln2.3lgVV

20、 o228.711riaF s Veea F sa F s io210eea Fio221111SeBeSa KBa K等强信号方向0图11 振幅定向法单脉冲雷达测角等强信号方向天线11RR2Rl图 12 相位定向法单脉冲雷达测角混频器对数中频放大器检波器本振减法电路混频器对数中频放大器检波器2( )f1( )f( )s图13 振幅角度鉴别器方框图自适应天线自适应天线1分集技术分集技术2软件无线电软件无线电3案例分析案例分析41122sinsinsinsincossincossin02222iqiqddddWWWW1122sinsinsinsincossincossin02222qiqiddddWWWW1122sinsinsinsincossincossin12222iqiqddddWWWW1122sinsinsinsincossincossin02222qiqiddddWWWWout12expj( sin )/2exp j( sin )/2SW sdW sdout12expj( sin )/2exp j( sin )/2NW ndW nd111iqWWjW1sin( sin )/2cos( sin )/22sin (si