提高跳頻頻率合成器鎖定速度的研究與實(shí)現(xiàn).pdf

1、天津大學(xué)碩士學(xué)位論文提高跳頻頻率合成器鎖定速度的研究與實(shí)現(xiàn)姓名：武永軍申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：通信與信息系統(tǒng)指導(dǎo)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