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星敏感器高精度星点提取系统误差分析及补偿方法研究.docx

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星敏感器高精度星点提取系统误差分析及补偿方法研究 Abstract Starsensorsareimportantcomponentsofspacecraftattitudedeterminationandcontrolsystems.Theaccuracyofstarpointextractioniscriticaltotheoperationofstarsensors.Thispaperanalyzestheerrorsourcesaffectingtheaccuracyofstarpointextractioninhigh-precisionstarsensorsandproposesacompensationmethodtoimprovetheaccuracyofstarpointextraction.Thecompensationmethodisbasedontheprincipleoferrorcorrectionandisverifiedbysimulationexperiments. Introduction Starsensorsarewidelyusedinspacecraftattitudedeterminationandcontrolsystemsbecauseoftheirhighmeasurementaccuracyandreliability.Theaccuracyofstarsensormeasurementsdependsontheaccuracyofstarpointextraction.However,starextractionerrorscanbeaffectedbyvariouserrorsourcessuchasinstrumentorenvironmentalfactors.Therefore,itisimportanttoanalyzetheerrorsourcesaffectingtheaccuracyofstarpointextractioninhigh-precisionstarsensorsandproposeacompensationmethodtoimprovetheaccuracyofstarpointextraction. ErrorSourcesAnalysis Theerrorsaffectingtheaccuracyofstarpointextractioncanbedividedintotwocategories:randomerrorsandsystematicerrors. Randomerrorsarecausedbytheintrinsiclimitationsofthesensororexternalfactors,suchasnoise,vibration,andtemperaturefluctuation.Randomerrorscanbereducedbyaveragingthemeasurementsorusingsignalprocessingtechniques. Systematicerrorsarecausedbythedesignorcalibrationofthesensor.Thefollowingfactorsmayresultinsystematicerrors: -Opticaldistortion:Anopticaldistortioncancausestarimagestobedistorted,makingitdifficultforthesensortoidentifythestars. -Detectormisalignment:Misalignmentofthedetectorcancausethepositionofthestarimagetobeoffset,leadingtoerrorsinthestarpointextraction. -Attitudeerror:Theattitudeerrorofthespacecraftcancausetheapparentpositionofthestarstochange,leadingtoerrorsinthestarpointextraction. -Non-uniformityofthedetectorresponse:Thenon-uniformityofthedetectorresponsecancausesomeareasofthestarimagetobeoverexposedorunderexposed,leadingtoerrorsinthestarpointextraction. CompensationMethod Toimprov