谐振式光学陀螺频率锁定技术与FPGA实现

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1、浙江大学信息与电子工程学系硕士学位论文谐振式光学陀螺频率锁定技术与FPGA实现姓名：鲍慧强申请学位级别：硕士专业：微电子与固体电子学指导教师：马慧莲;金仲和20100101浙江大学硕士学位论文构成的频率伺服回路精度为o．02。／s，阶跃响应时间60ms。在上述分析和电路研制的基础上，对基于调相谱检测技术的谐振式光学陀螺系统进行了实际陀螺转动信号的测试，并对陀螺静止时的输出波动进行了测试，在10s的积分时间参数下，零偏约．12。／s，阈值精度0．1。／s。关键词：谐振式光学陀螺、频率锁定技术、数字锁相放大器、PI控制器、FPGAIII浙江大学硕士学位论文AbstractResonat

2、oropticgyroscopeisanewhigh—precisionangularrotationsensorbasedonSagnaceffect．Theopticringresonator,asthekeyrotationsensingelement，isimplementedwithashortsensingfibercoilorallintegratedoptics．Ithastheuniqueadvantagesforminiaturizationandintegration．Intheresonatoropticgyroscope，theangularrotatio

3、nvelocityismeasuredthroughthedetectionoftheresonantfrequencydifferencebetweentheclockwiseandthecounter-clockwiselightwavescounter-propagatingintheresonator．Therearemanykindsofreciprocitynoisesintheloopastheactualopticaldevicessuchaslasersource，opticringresonator,etcsubjecttoenvironmentalfactor

4、ssuchastemperatureandstressfluctuations，whiletheresonantfrequencydifferencecausedbytheSagnaceffectisnon—reciprocityandextremelyweak．Therefore，thelaserfrequencymustbelockedtooneoftheresonantfrequencyoftheresonatorthroughthemodulationanddemodulationmethods．Ahigh-precisionfrequencylockingmethodaf

5、fectsthegyrosensitivitydirectlyinthepracticalgyrosystem．Ontheonehanditisessentialtoestablishagoodfrequencylockingloopinordertoreducetheimpactofreciprocitynoise．Thedetectionsensitivityofthefrequencylockingloopfinallydependsontheaccuracyofthesignalprocessingcircuits．Undertheabovebackground，adigi

6、talsignalprocessingcircuitincludingthedigitalLIAandthefrequencyservoloopbasedonthePIcontrollerisdesignedandimplementedfortheresonatoropticgyroscope、ⅣitIla7．9cmlengthopticalwaveguideringresonator．AlltheprocessingcircuitisimplementedwithasingleFPGA．Specifically,thispapercardedoutfollowingresearc

7、hworks：Byanalyzingthecharacteristicsandthetransferpatternsofthereciprocitynoisesinthefrequencylockingloop，itWasfoundthelaser，theopticalringresonator,thephotodetector,andtheunitgainofthedemodulationcircuitscouldbelookedasonemodel．Avariab