資源描述:
《超短波跳頻數(shù)傳電臺鏈路設計和實現(xiàn)》由會員上傳分享,免費在線閱讀,更多相關內(nèi)容在學術論文-天天文庫。
1、摘要超短波跳頻數(shù)傳電臺具有良好的抗干擾能力和保密能力,在民用及特殊環(huán)境通信中都有著廣泛的應用。設計并實現(xiàn)超短波跳頻數(shù)傳電臺仿真軟件,對超短波跳頻電臺的研發(fā)具有重要的工程應用價值。本文根據(jù)用戶需求,在深入進行需求和相關技術指標分析的基礎上,給出了超短波跳頻數(shù)傳電臺鏈路仿真軟件的總體設計方案,該方案能夠支持多種信道編碼、調(diào)制方式和適合山區(qū)、丘陵等信道環(huán)境。論文的重點在于跳頻同步、信道建模以及相關指標評估等方面。工作的關鍵在于跳頻同步、信道建模以及相關指標的評估三方面。本文采用將TOD信息作為同步字頭的方法實現(xiàn)跳頻同步,主要闡述該方法的原理及關鍵步驟;結合丘陵地帶超短波信號的傳播特
2、點和跳頻通信的特點,完成了鏈路信道的仿真建模;根據(jù)用戶要求的評估指標,給出了各指標的測試與評估方法,并設計了相應的仿真測試模塊。最后在ADS仿真軟件和Matlab上,實現(xiàn)了超短波跳頻數(shù)傳電臺鏈路仿真軟件。該仿真軟件能夠?qū)φ`比特率、解調(diào)輸出信噪比、頻譜圖、誤差向量幅度值和信道衰落深度等進行評估與分析。論文對超短波跳頻數(shù)傳電臺鏈路仿真軟件進行了測試,測試結果表明:該仿真軟件滿足用戶提出的所有要求,現(xiàn)已交付用戶使用。關鍵字:超短波跳頻擴頻通信鏈路ADS超短波跳頻數(shù)傳電臺鏈路的設計與實現(xiàn)AbstractWithwellanti-interferenceabilityandsecure
3、ability,theUltrashortwaveFHSSdata-transmittedradioiswidelyusedinbonlcivilandspecialcommunication.DesignandimplementationoftheUltrashortwaveFHSSdata-transmittedr.a(chǎn)diosimulativesoftwarehasimportantengineeringandappliedvalueintheresearchanddevelopmentoftheUltrashortwaveFHSSdata-transmittedradi
4、o.Accordingtothedemandsoftheusersandinthebaseofdeeplyanalyzingthedemandsandthetechnicalnorms,thispapershowstheoveralldesignedproposalofthesoftware.Theproposalcallprovidemanymethodsofmodulationandchannelcoding,andsuitsthechannelenvironmentofthehillyareas.Thefocalpointsofthispaperlieinthemeth
5、odofFHSSsynchronization,modelingofthechannelsandevaluationofthenorms,ete.ThispaperusessynchronizedmethodwhichmgardsTODinformationasthesynchronoushead,mainlyexpoundsprincipalandkeystepsofthismethod.CombiningthefeaturesofthefrequencyhoppingcommunicationandtheUltrashortwavesignalwhichtransmits
6、inhillyareas,thechannelsofthelinkaresimulatedandmodeled.Accordingtotheevaluatednormswhichtheusersneed,thetestedandevaluatedmethodsofthenormsareshowedandrelevantmodulesofsimulationandtestaredesigned.Last,thesimulativesoftwareoftheUltrashortwaveFHSSdata-transmittedradiolinkisimplementedbyADSa
7、ndMatlab.ThesimulativesoftwareCanevaluateandanalyzeBER,SNRafterdemodulating,frequencyspectrum,EVMandthechannelfadedepth,etc.11lesimulativesoftwareoftheUltrashortwaveFHSSdata-transmittedradiolinkhasbeentestedinthispaper.Theresultsofthetestindicatethatthes