地铁上盖物业的振动舒适度分析

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1、AbstractWiththecontinuousdevelopmentofsocialscientific，technologicallevelandeconomic．thesignalismoreandmorecrowdedbecauseofasignificantincreaseoftheshort．waveradiocommunicationsequipment．Theelectromagneticenvironmentofshort．waveradiocommunicationsisincreasing

2、lycomplex．Duetotheshortdistance，whenmultipleradioworksimultaneously,theywillinterferewitheachother,andwhat'sevenworse，theydonotworkbecauseoftheblockingofshortwavereceivers．Therefore，thedesignofanti-noise，anti-jamming，anti-decay,anti．multipathbystrongshort-wav

3、ereceiverhasaveryimportantsigniticance·Accordingtotheintroductionoftheideaofsoftwareradio，thecontentofthepaperiSthatdesignandachieveashortwavereceiverwithstronganti。interferenceability,goodnoisefigureandthereceiverisbasedonCNChigh-frequencyandimermediatefrequ

4、encyfront．endcircuitwithhighanti-interferenceability．Thebasicideaofsoftwareradioisacommon,standard，modularhardwareplatformbasedonsoftwareprogrammingtoachievethevariousfunctionsoftheradiostation,freedfromthehardware．based，purpose．orientedradiostationtraditiona

5、ldesignmethods·Itspurposeistoconstructacommonplatformofopen，standardizedandmodular,theworkingfrequencyband，modulationanddemodulationtype，dataformat，encryptionmode，thecommunicationprotocolarecompletedbysoftware，weusesoRwaretoacllieVetllefunctionofthemixingofan

6、alogcircuits，filtering，modulationanddemodulation．Theapplicationofsoftwareradiotechnologyintheshort。wavecoInmumcationmaketheshort．wavecommunicationuniversal，automated，modular,combinedwithtlleKgh．frequencyandintermediatefrequencyfront。endsignalprocessingcircuit

7、，makingthedesignofshort-wavereceiverwithsoftwareradiouniversal，flexiblefeatures，alongwithtraditionalanalogreceiverhighanti。noiseadvantage．whichiSthebasicideaofthisprojectdesign．Thespecificcontentofthestudyofthissubjectisthat，short—waveradiosignalswhoreceivedb

8、yantennapassthefront-endprotectionandCNCattenuator．Thentracktheselectedfrequencybythepreselectedtrackingfilter,toeliminateinterferenceandnoiseoutofband．Afterthegaincontrollableamplifierwi