地铁上盖物业的振动舒适度分析

地铁上盖物业的振动舒适度分析

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时间:2019-06-25

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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

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