Abstract: Traditionalmethodsforspinsatelliteattitudedeterminationusuallyutilizeearthsensorandsunsensorasthemeasurementinstruments.Thegeneratedsystemerrorsandinstallationerrorandsoonwillleadtolargespinattitudeerrors.Consideringthisproblem，anewmethodusingcontinuousstarmapacquiredbyastarsensortoestimatethespinattitudeparametersofthesatellitewasproposed.Inthismethod,thespinaxisandtheangularvelocityofthesatellitewereusedasstatevariables,andthepixelcoordinatesofstarsobtainedthroughstarmapmatchingbetweenadjacenttimewereusedasmeasurements.ThespinattitudeparametersofthesatellitewereestimatedbyunscentedKalmanfilter.Simulationresultsshowthatwiththestarsensoraccuracyof3″,theestimationaccuracyofthespinaxisislessthan0.3448″andtheestimationaccuracyofspinangularvelocityisof10^-4(°)/smagnitude.

Key words: Spinsatellite, Starmapobservation, UnscentedKalmanfilter, Starsensor, Attitudeestimation