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1、中國(guó)民航大學(xué)碩士學(xué)位論文摘要為解決VHF偏置載波信號(hào)交叉覆蓋區(qū)域的干擾問(wèn)題,提高地空通信通話質(zhì)量,保證飛行安全,論文分析了交叉覆蓋區(qū)域各種干擾的現(xiàn)象及產(chǎn)生機(jī)理,研究了常見(jiàn)干擾的解決方案,并通過(guò)實(shí)驗(yàn)提出了特殊干擾的解決方案和優(yōu)化原則。本文在介紹民航VHF地空通信系統(tǒng)的工作原理及系統(tǒng)結(jié)構(gòu)的基礎(chǔ)上,對(duì)VHF偏置載波信號(hào)交叉覆蓋系統(tǒng)的基本原理及存在的問(wèn)題進(jìn)行分析,并從干擾產(chǎn)牛機(jī)理的角度對(duì)中國(guó)民航近兩年已查明的典型干擾案例進(jìn)行了分析統(tǒng)計(jì)。結(jié)合北京管制區(qū)域偏置載波信號(hào)交叉典型干擾案例,論文從干擾現(xiàn)象出發(fā),分析了各種
2、干擾的產(chǎn)生機(jī)理,歸納總結(jié)了常見(jiàn)干擾的解決方案。針對(duì)特殊干擾之一差拍干擾,論文通過(guò)實(shí)驗(yàn)測(cè)試多個(gè)電臺(tái)在不同頻偏設(shè)置下,接收信號(hào)的頻率和話音效果特性,對(duì)頻偏設(shè)置方案進(jìn)行分析,得出偏置載波法頻率及臺(tái)站設(shè)置的優(yōu)化原則;針對(duì)另一種特殊干擾——時(shí)延干擾,論文通過(guò)對(duì)北京管制區(qū)域VHF通信系統(tǒng)發(fā)射時(shí)延的實(shí)驗(yàn)測(cè)試,分析得出現(xiàn)行解決方案在我國(guó)不夠完善的原因,并提出了GPS話音同步解決方案。研究結(jié)果表明,運(yùn)用偏置載波法應(yīng)避免3個(gè)以上的臺(tái)站覆蓋同一個(gè)扇區(qū),各電臺(tái)的頻偏差盡量在7.5K以上,且頻偏差越大越好。GPS話音同步解決方案
3、使不同地點(diǎn)的各發(fā)射機(jī)所發(fā)送的信號(hào)在頻率和時(shí)間上都能保持同步,既解決了時(shí)延干擾,又實(shí)現(xiàn)了異地同頻,該方案在實(shí)地進(jìn)行了試用和驗(yàn)證,結(jié)果表明干擾得到了有效抑制。關(guān)鍵詞:VHF,干擾,偏置載波法,同步中國(guó)民航大學(xué)碩士學(xué)位論文AbstractInordertosolvetheproblemthatkindsofinterferenceoccurfi'equentlyintheVHFoff-setcarrieroverlappingarea,improvethequalityoftheair-groundcommu
4、nicationandensurethesecurityofcivilaviation,thephenomenonandmechanismofcommonandspecialinterferenceareanalyzed,thecorrespondingsolutionsforcommoninterferenceareresearchedandthesolutionstogetherwithoptimizedmeasureforspecialinterferenceareproposed.Ontheba
5、seofelementsandframeworkofcivilaviationVHFair-groundcommunicationsystem.themechanismandproblemsoftheoff-setcarriersystemareanalyzed.Thestatisticsoftypicalcasesinlatesttwoyearsareanalyzedbasedonthemechanismoftheinterference.Thecausesandmechanismofinterfer
6、enceinoverlappingareaareanalyzedbycombiningwithtypicalcasesinBeijingareacontrolcenterfromthekindsofphenomenon.Thecorrespondingsolutionsforcommoninterferencearealsoproposed.Tooneofthespecialinterferenceinoverlappingarea.—-theCO—claannelinterference.thecha
7、racteristicfeaturesofsignaltransmittedbymulti-transmitterssettingdifferentoff-setfrequencyaretested,andthesettingmethodofthefrequencyisanalyzed.Thentheoptimizedsettingofthefrequencyandtransmittersisgained.Toanotherspecialinterferenceinoverlappingarea·—-t
8、betime—laginterference,thereasonwhycurrentsolutionisinapplicableinournationisgainedfromtheexperimentinBeijingareacontrollingcenter.AndthenthesynchronizationsolutionusingGPSisintroduced.Theresultsindicatethatmorethanthreeof