PKI系統(tǒng)證書服務(wù)的實(shí)踐和優(yōu)化研究.pdf

1、南京理工大學(xué)碩士學(xué)位論文調(diào)頻步進(jìn)雷達(dá)技術(shù)研究姓名：紀(jì)小利申請學(xué)位級別：碩士專業(yè)：通信與信息系統(tǒng)指導(dǎo)教師：牟善祥2001.3.1ABSTRACTThisdissertationfclllowsthetracksoftheresearchfoCUSofwidebandHRRradartechniquesathomeandabroad，andmakesastudyofradartechniqueswithtWOkindsofwavefornl

2、sAccordingtotheanalysisofLMFstepped—frequencyradarwaveform’Sambiguityfunction，theambiguitycharacteristicsofthewaveformareconcludedAndthesignalprocessingandtheDopplerperformancesareanalyzedThenthesystemblockdiagramofLMF—s

3、teppedfrequencyradarisproposed，andtheprinciplethatintrapulseandinterpulsetwo—stagecompressionprovidesbigcompressionratioisalsoanalyzedAftertheprinciple，characteristicsandconstructionofCostasarrayareintroduced，withrespect

4、todelay—DopplercouplingandbiggerambiguitysidelobewhichexistinLMF—stepped—frequencyradarsystem，arlewwaveformutilizingCostassequencesandLMFstepped—frequencyradartechniquesisusedasagoodhighrangeresolutionradarsignal，whichis

5、calledLMFCostas—steppedfrequencyradarsignalAfterthat，thesystemblockdiagramoftheLMF—Costas—steppedfrequencyradarisgivenTheambiguityfunctionisemployedtostudytheLMFCostasstepped—frequencyradarAndthen，theambiguitycharacteris

6、ticsoftheradarsignalareconcludedincomparisonwithLMF—steppedfrequencyradarsignalMoreoverthesignalprocessingandtheeffectsoftargetmotiononthesyntheticrangeprofilearestudiedAtthesametime，theuniversalmethodtosynthesizerangepr

7、ofileisproposedItisalsoanalyzedthatrandomshiftingofcarrierfrequencybringseffectsonsyntheticrangeprofileintheLMF—CostassteppedfrequencyradarTheintroductionofCostascodemakessyntheticrangeprofilewidenatrangedimensiontOformr

8、andomsidelobeInordertoreduceitseffects，acoherentprocessingmethodofseveraltrainsofLMF—Costas—steppedfrequencypulseisproposedtestrainclutterKeywords：linearmodulatedfrequency(LMF)，steppedFrequencyCostasarrayambiguityfunctio