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