1.11818871901Hz)18951-11.20Hz 20kHz20Hz2020kHz-80kHz220VCTm =/2x220V = 314Vc10次声0I蚂和海豚对超宦波 很敏感,它们奁行进 中发超声滾.井接收 其折射浚.拿超声渡 定位和测距./20000 80000二/(Hz)十)粗声1-2220VCTm =/2x220V = 314Vc220VCTm =/2x220V = 314Vc200001-3tUq(1)/tHz。50Hz50(2TsT“电压/-yo(3AA = TC A = y,CJVZ7町1円C = 3.00xi08m/soT(4)u周期Vsuum1-3u = LLsinoz2.十入15 20000kmSc fcFfcfc3 fc(1(2)(3)4.AMGSMMSKRF1-1-2220VCTm =/2x220V = 314VcIF)RFfcFF1-4鮮调是将巳询浪 还原为音频，是 反调制”的过程放大1-42.3./ffc = fflfc/o fc/4.IF IF5FAMFMGSM6900MHz,RFIF：(3)RFTX-IFTX-IFRF22.5.2IF】1.2-11-5OL/1-5A Bfi A(1)(2)(3)(4)(5)2.1-6A B(1)IJ1-61.2.2AB1-71.3131(1)30m(41.3-2、/MS.YMS, Ifl50km o1-91-9fl flA Bme D/l2.1-101-103.(1lkm 30km“网2.1BBSSSMSBBSBTSBSCMSCVLRAUCHLK2-13MSnrBSCq一个MSC和若本地网J空中接（ !、匕HLR是佛存用户 原輪參数的静态2-1-12-1.2BSSBTSiMS一个圣站有数BTS.BTS.MSC用户数据流 控制流AUC对用户另份 认证防止盗机VLR足存储MS2-12030BTSBSCo1.BTSBTS,BTS,TCH50 BTS50BCH(1)MNCBCH(2)(3)FCH(4SCH(5)PCH(6)RSSI2BSCBSCBTSBSC BTSBTSBSCBS)BS2.1.3ssMSCVLRHLREIRAUCOMCoMSCo1.MSCMSCMSCMSCMSCPLMNPSTNISDNMSCVLRHLRAUCEIRoMSC(1(2)MSC(3)2.VLRMSCVIRVLRVLRMSRNHLRVLRMSVLRMSVLR3.HLRHLRMSCHLRIMS1HLRVLRMSCMSMSMSCHLRMSVLRMSVLRVLRMSHLRIMEI4.AUCAUCAUCVLR5.EIREIRIMEI,EIR6.OMCOMCAUC2.2MSC890 -915MHz45MHz935 960MHz。45MHzTACS25MHz25kHzGSM200kHz2-2GSM900MHz2.2-2 GSMDCS1800GSMGSM900 DCS18003.ARFCHAo4.l_30km5.TAGSMSKGSMMSK270kb/sBo3.12.3CH2-12.3.2GSMGSMTCHoGSM2-3GSMGSMBCIIBCHBCH2-3 GSM(1)BCH(2)(3)(4)2.MNCFCHPCHFCHSCHoFCH3.PLLPLLSCHCPUTDMAsen4.PCHABPCHo PCHBB5.RACHAGCHRACHAGCHTCHo6.FACCHSDCCH7.SACCHSACCHFACCHFACCH2-3SACCHFACCHBCHTCHTCHTCHFACCHSACCHSACCHRCH4.615msFACCHGSMSACCH26FACCH122.42-4一一TCHFACCH于机之问週佰 必須经过基站, 圣站好比中 介所-2-4BCHTCHBCHBCHTCHGSMCPUPLL200kHz200kH冇则在机i2-5公用信道A空闲信迪(V、CH1 |CH2| - -|CH.|加 |CH；|CH； |- ；/ - )CH；广播信道ii5i业务信道（控制信iff）（话音伍ii）PLL22.2BCHBCHBCHBCHBCHMNCBSICFCHSCHRSSISIMBCHBCHTCHCPUPLLRACHPCHTCHCPUCH,、讯CH1、.CH：2-5202.5.1TACSFDMATACS19851987GSMTDMAGSM19801982GSM198716GSMCEPTGSMGSM1000199320TACSGSM90GSMGSMGSM2.5.2wheneverwhereverwhomeverwhoeverwhatev erPCN5WPCSPCNInternetIntemert2-5.32002CDMACDMA CDMAIMT-2000WCDMAUMTSCDMA _ 2000(1)(43GtfoCDMA900MHz 1800MHz2002AT&T5AT&T5Internet2.5.43G4GAT&T4GAT&T5TDMAGSMCDMATDMAGSM