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ID:39126610
大小:2.03 MB
页数:58页
时间:2019-06-25
《地铁上盖物业的振动舒适度分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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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