Abstract: detectionmethodbasedonpredictiondispersionwaspresentedtodealwithLEOspacecraftorbitanomalycausedbymaneuvers,collisions,andatmosphericenvironment.Thesemimajoraxisandinclinationwereselectedasorbitcharacteristicparameters.PredictionvaluesoforbitcharacteristicparameterscanbeachievedbyorbitextrapolationbasedonSGP4modelsecularterm.Afterdatasmoothingprocess,predictiondispersionsequencecanbeobtainedbycalculatingthedifferencebetweenpredictionandcatalogvaluesofthecharacteristicparameters.TheorbitanomalywasdetectedthroughthepredictiondispersiondatabasedonMahalanobisdistance.ThedetectionresultsofTerrain2010isconsistentwiththemaneuverhistorypublishedbyNASA,whichindicatethatthemethodpresentedinthispapercandetectthetimes,epochandtypeoforbitanomalyandcanbewidelyappliedtothespacesurveillanceandspacesituationalawareness.

Key words: Lowearthorbit, Orbitanomaly, Simplifiedgeneralperturbation4modelMahalanobisdistance, Twolineelements, Spacecraft