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MEMS慣導(dǎo)-單目視覺(jué)里程計(jì)組合導(dǎo)航技術(shù)研究摘要
慣性導(dǎo)航系統(tǒng)(InertialNavigationSystem,INS)和視覺(jué)里程計(jì)(VisualOdometry,VO)是目前室內(nèi)和低空無(wú)人機(jī)(UAV)導(dǎo)航的兩種主要方式。然而,INS存在著漂移誤差隨時(shí)間的積累問(wèn)題,VO又容易受到場(chǎng)景(如光照強(qiáng)度、環(huán)境雜音等)的干擾。為了解決這些問(wèn)題,MEMS慣性傳感器和單目相機(jī)被廣泛應(yīng)用于導(dǎo)航中,成為組合導(dǎo)航的重要組成部分。本文針對(duì)MEMS慣導(dǎo)和單目VO組合導(dǎo)航技術(shù)的研究現(xiàn)狀和發(fā)展趨勢(shì)進(jìn)行了綜述和分析。首先介紹了MEMS慣導(dǎo)和單目VO的基本原理和優(yōu)缺點(diǎn),然后分別闡述了它們各自的應(yīng)用場(chǎng)景和存在的問(wèn)題。接著,結(jié)合實(shí)際的應(yīng)用需求和發(fā)展趨勢(shì),提出了MEMS慣導(dǎo)和單目VO組合導(dǎo)航的技術(shù)框架,包括誤差模型、狀態(tài)估計(jì)、濾波算法、閉環(huán)校正等方面的研究?jī)?nèi)容。最后,提出了未來(lái)研究的方向和重點(diǎn),以期為MEMS慣導(dǎo)和單目VO組合導(dǎo)航技術(shù)的發(fā)展提供參考和指導(dǎo)。
關(guān)鍵詞:MEMS慣導(dǎo);單目視覺(jué)里程計(jì);組合導(dǎo)航;誤差模型;狀態(tài)估計(jì);濾波算法;閉環(huán)校正
Abstract
InertialNavigationSystem(INS)andVisualOdometry(VO)aretwomajormethodsforindoorandlow-altitudeunmannedaerialvehicle(UAV)navigation.However,INShastheproblemofaccumulateddrifterrorovertime,andVOiseasilyaffectedbyscenes(suchaslightingintensity,environmentalnoise,etc.).Tosolvetheseproblems,MEMSinertialsensorsandmonocularcamerasarewidelyusedinnavigationandhavebecomeanimportantpartofintegratednavigation.ThispaperreviewsandanalyzesthecurrentstatusanddevelopmenttrendsofMEMSinertialnavigationandmonocularVOintegratednavigationtechnology.Firstly,thebasicprinciplesandadvantagesanddisadvantagesofMEMSinertialnavigationandmonocularVOwereintroducedrespectively,andtheirrespectiveapplicationscenariosandproblemswereelaborated.Then,basedonpracticalapplicationneedsanddevelopmenttrends,thetechnicalframeworkofMEMSinertialnavigationandmonocularVOintegratednavigationwasproposed,includingerrormodel,stateestimation,filteringalgorithm,closed-loopcalibration,etc.Finally,thedirectionandfocusoffutureresearchareputforwardtoprovidereferenceandguidanceforthedevelopmentofMEMSinertialnavigationandmonocularVOintegratednavigationtechnology.
Keywords:MEMSinertialnavigation;monocularvisualodometry;integratednavigation;errormodel;stateestimation;filteringalgorithm;closed-loopcalibratioIntegratednavigationtechnologybasedonMEMSinertialnavigationandmonocularvisualodometry(VO)hasreceivedincreasingattentioninrecentyearsduetoitsadvantagesoflowcost,smallsize,andhighaccuracy.However,theintegrationofthesetwosensorspresentsmanychallenges,suchassensorbiases,scalefactorerrors,andmodelingofsensorerrors.
Toaddressthesechallenges,researchershaveproposedvariouserrormodelstodescribetheerrorcharacteristicsofbothsensors.Stateestimationtechniques,suchasKalmanfiltersandparticlefilters,havealsobeendevelopedtoestimatethesystemstateandattenuatethemeasurementnoise.Closed-loopcalibrationmethodshavebeenproposedtoestimateandcorrectthesensorerrorsinreal-timeduringoperation.
Despitetheconsiderableprogressmadeinthisfield,therearestillseveraldirectionsforfutureresearch.Firstly,improvingtheaccuracyandrobustnessoftheintegratedsystemremainsachallenge,especiallyunderharshconditions.Secondly,theintegrationofothertypesofsensors,suchasGlobalNavigationSatelliteSystem(GNSS)andLiDAR,canfurtherenhancetheperformanceoftheintegratednavigationsystem.Thirdly,thereal-timeperformanceandcomputationalefficiencyofthealgorithmsneedtobeimprovedtomeettherequirementsofvariousapplications.
Inconclusion,theintegrationofMEMSinertialnavigationandmonocularVOisapromisingtechnologyfornavigationinvariousapplications,andfurtherresearchwilldriveitsadvancementandapplicationinthefutureAdditionally,theintegrationofinertialnavigationandmonocularVOopensupnewopportunitiesforautonomousnavigationinchallengingenvironments.Forexample,inindoorenvironmentswhereGPSsignalsmaybeweakornon-existent,thistechnologycanprovideaccuratenavigationwithouttheneedforexternalpositioningsystems.Thiscanbeparticularlyusefulinapplicationssuchasrobotics,whereprecisenavigationisessentialforsuccessfuloperation.
Anotherpotentialapplicationforthistechnologyisinautonomousvehicles,wheretheintegrationofinertialnavigationandmonocularVOcanaidinprecisevehiclepositioningandlocalization.Thiscouldeventuallyleadtothedevelopmentoffullyautonomousvehiclesystems,reducingtheneedforhumaninterventionindrivingtasks.
However,therearealsoseveralchallengesthatneedtobeaddressedintheintegrationofinertialnavigationandmonocularVO.Oneofthemostsignificantchallengesistheneedforaccuratecalibrationofboththeinertialandvisualsensors.Accuratecalibrationisessentialforachievinghigh-precisionnavigation,anditrequirescarefulconsiderationofvariousfactors,includingsensornoise,systembiases,andrandomerrors.
Anotherchallengeisthedesignofrobustalgorithmsthatcaneffectivelyfusedatafrombothinertialandvisualsensors.Thisrequiresthedevelopmentofcomplexfilteringtechniquesthatcanhandlenoisyandunreliablesensordatainreal-time,whilestillmaintainingaccuracyandprecision.
Despitethesechallenges,theintegrationofMEMSinertialnavigationandmonocularVOrepresentsasignificantstepforwardinthefieldofnavigation,withnumerouspotentialapplicationsinvariousindustries.ContinuedresearchanddevelopmentinthisareawillbeessentialforfurtheradvancingthetechnologyandunlockingitsfullpotentialinthefutureInadditiontothechallengespreviouslydiscussed,thereareseveralotherfactorsthatcanimpacttheaccuracyandreliabilityofMEMSinertialnavigationandmonocularVOsystemsinreal-timeapplications.Thesefactorsincludevibrations,temperaturevariations,andelectromagneticinterference.
VibrationscanintroduceerrorsintothemeasurementsrecordedbyMEMSinertialsensors.Thiscanbeparticularlyproblematicforapplicationsintheautomotiveandaerospaceindustries,wherevehiclesexperiencesignificantvibrationsduringoperation.Severalstrategieshavebeendevelopedtomitigatetheeffectsofvibrationsoninertialnavigationsystems,suchasusinghigh-sensitivitysensorsandapplyingsophisticatedfilteringalgorithmstothesensordata.Additionally,someresearchhasexploredtheuseofadditionalsensorstoprovidecomplementarydataandimprovetheaccuracyofthenavigationsysteminvibratingenvironments.
TemperaturevariationscanalsoimpacttheaccuracyofMEMSinertialsensors.Becausethesesensorsrelyonthemovementofsmall,delicatecomponents,theyaresusceptibletochangesintemperaturethatcancausedriftandothererrors.Somesolutionstothisproblemincludeincorporatingtemperaturecompensationalgorithmsthatcanadjustthesensorreadingstoaccountfortemperaturevariations,orusingsensorsthataremorerobusttotemperaturechanges.
Electromagneticinterference(EMI)isanotherfactorthatcanimpacttheperformanceofMEMSinertialsensors.Thiscanbeparticularlyproblematicinindustrialsettingswheretherearehighlevelsofelectromagneticradiationfromequipmentandmachinery.EMIcancausenoiseinthesensordata,whichcanmaskthesignalsthatthenavigationsystemistryingtodetect.OnesolutiontothisproblemistoshieldthesensorsandothercomponentsfromEMIusingspecializedmaterialsandtechniques.
Despitethesechallenges,therearenumerouspotentialapplicationsforMEMSinertialnavigationandmonocularVOsystemsinindustriessuchasaerospace,automotive,robotics,andvirtualreality.Forexample,thesesystemscouldbeuse
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