光纤陀螺的信号处理与闭环检测技术研究

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1、密级无分类号Ｖ２４１．５ｍ＇ＡＮＸＩＴＥＣＨＮＯＬＯＧＩＣＡＬＵＮＩＶＥＲＳＩＴＹ硕士学位论文？题目：光纤陀螺的信号处理与闭环检测技术研究作者：苏耀指导教师：．刘钧教授申请学位学科：光学工程２０１８年５月１６日密级无分类号V241.5XI’ANTECHNOLOGICALUNIVERSITY硕士学位论文题目:光纤陀螺的信号处理与闭环检测技术研究作者：苏耀指导教师：刘钧教授申请学位学科：光学工程2018年5月16日号的调制解调和反馈。系统在常

2、温条件下的零偏为22.154°/h，标度因数为341.72bit/°/s，标度因数非线性为1109.41ppm。所设计的光源驱动电路和信号检测电路满足指标要求，达到了预期效果。关键词：光纤陀螺；闭环检测；恒流/温控；现场可编程门阵列；反馈gyroscopeatpresent.Thispaperalsodesignedaclosed-loopdetectioncircuit,includingsignaldetectionanalogcircuit,digitalclosed-loopdetectionc

3、ircuitandfeedbackdrivecircuit,thecoreprocessingunitinthiscircuitisFPGA.Thesignaldetectionanalogcircuitrealizesthephotoelectricconversionandanalog-to-digitalconversionoflightsignal.Thedigitalclosed-loopdetectioncircuitmainlycompletesthedemodulationofmodul

4、atingthedigitalsignal,generatingthestepfeedbacksignal,andoutputtingthesignalinformation.Thefeedbackdrivecircuittransformsthestepwavesignalandbiasmodulatedsignalintovoltageanalogsignaltoactonthephasemodulator.ThesystemrealizesthecommunicationbetweenFPGAan

5、dhostcomputerthroughUART.Finally,Wehaveperformedaperformancetestonthelightsourcedrivecircuitanddigitalclosed-loopdetectioncircuit.Testresultsareasfollows:Thelightsourcedrivingcircuiteffectivelyimprovesthecurrentdriftandtemperaturedriftoflightsource.Thema

6、ximumdeviationofcurrentiswithin0.5mA.Inthetemperaturerangeof-40℃~60℃,thewavelengthofthelightsourceisstableat1310±0.3nm,andthestabilityoflightpowerislessthan7μW.Theclosed-loopdetectioncircuitcaneffectivelyextractstheopticalsignalof100KHz,andcompletesthemo

7、dulation/demodulationofthesignal.Atroomtemperature,thezerodriftofthesystemis22.154°/h,thescalingfactoris341.72bit/°/s,andthenonlinerityofscalingfactoris1109.41ppm.Thelightsourcedrivecircuitandsignaldetectioncircuitmeettherequirementsandachievesthedesired

8、effect.Keywords:Fiberopticgyroscope;Closed-loopdetection;Constantcurrent/Temperaturecontrol;FPGA;Feedback目录1绪论................................................................................................................