1、天津大學碩士學位論文提高跳頻頻率合成器鎖定速度的研究與實現(xiàn)姓名:武永軍申請學位級別:碩士專業(yè):通信與信息系統(tǒng)指導教師:沈保鎖2002.1.1ABSTRACTlnformationwarfareandcommunicationsystemsinthepresentrequirehigherandhighercommunicationtechnologyFH(FrequencyHopping)hasmanybenefitssuchasgoo
2、dsecurity,strongantijammingandCDMAnetworkbuilding,andetcTherebyitshowsmoreandmoreadvantagesinmilitaryandcivilutilizationHoppingfrequencysynthesizeristheheartofFHsystem,whoseperformanceaffectsthecapabilityofFHsystemcritic
3、allyThestudyandimplementationofhoppingfrequencysynthesizerisimportantforbuildingFHsystemThefundamentalprincipleofFHandhoppingfrequencysynthesizerisintroduced,andvarianttechnologiesoffrequencysynthesizinganalyzedandcompar
4、edinthethesisOnthisbasisfrequencysynthesizerschemeofDDSactuatingPLLisdesignedandoptimizedIn也escheme,meritsofDDSremedydefaultofPLLandmeritsofPLLremedydefaultofDDSAndSOhoppingspeedoffrequencyisfast,steppingoffrequencyfine,
5、andoutputfrequencyhighManywaysofimprovinglockingspeedoffrequencysynthesizerarediscussedinthisthesisOnthebasisofpresettingtechnologyofsketchilytuning,presettingtechnologyofselfadaptingisgiven,whichmakesPLLworkatthestateof
6、phaselockingallthetimeThereforelockingspeedofPLLmadlong—termstabilityofhoppingfrequencysynthesizerareimproved,TheschemeiSimplementedandverifiedinhardwarePerformanceofCauerfilter,VCOandPLLaretested,andthegraphsareprotract