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光纤陀螺,旋转捷联惯导系统误差分析(英文).docx

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光纤陀螺,旋转捷联惯导系统误差分析(英文) FiberOpticGyroscopes:ErrorAnalysisforRotationalStrapdownInertialNavigationSystems Introduction: FiberOpticGyroscopes(FOGs)areinertialsensorsusedinstrapdowninertialnavigationsystemsformeasuringangularvelocity.Thesesensorshavegainedpopularityinthefieldofnavigationandguidancesystemsowingtotheirhighaccuracy,lowpowerconsumption,andlonglife.However,likeanyothersensor,FOGssufferfromdifferenttypesoferrorsthataffecttheirperformanceaccuracy.Thispaperpresentsanin-depthanalysisofthevarioustypesoferrors,theircauses,andpossibletechniquesformitigatingtheseerrorsinFOGsystems. TypesofErrorsinFOGSystems: 1.BiasError:ThiserroroccurswhentheFOGreadingisnotequaltozerointheabsenceofangularvelocity.Theprimarycauseofthiserroristhepresenceofnon-zeroangularratewhentheFOGisnotmoving.Othercausesincludedriftinthesensor'scomponentsandtemperatureeffects. 2.ScaleFactorError:ThiserroroccurswhentheFOGreadingisnotproportionaltotheactualangularvelocity.TheprimarycauseofthiserrorissensitivitydriftintheFOG'scomponents. 3.RandomError:ThiserroroccursduetonoiseintheFOG'soutputsignal.ItaffectstheaccuracyoftheFOG'smeasurementsandiscausedbythermalfluctuations,electromagneticinterference,andotherenvironmentalfactors. FOGErrorMitigationTechniques: 1.Calibration:ThismethodinvolvesmeasuringtheerrorsintheFOGandadjustingtheoutputsignalsuchthatitisaccurate.ThecalibrationprocesscanbedonebeforeorduringtheoperationoftheFOG.Thismethodallowsforthecorrectionoferrorssuchasbiasandscalefactorerrors. 2.TemperatureCompensation:Thismethodinvolvescompensatingforthetemperature-dependentdriftsintheFOG'scomponents.TheFOG'sbiasandscalefactorerrorsareaffectedbychangesintemperature,andthismethodinvolvesmeasuringthetemperatureandadjustingtheoutputsignal. 3.Redundancy:ThismethodinvolvesusingmultipleFOGsinasystemtomeasurethesameangularvelocity.AcommontechniqueistousethreeFOGsinasystemsuchthattheirreadingscanbeaveragedtoobtainanaccuratemeasurement.ThismethodallowsforthereductionofrandomerrorsinFOGsystems. Conclusion: