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The Advanced Space-based Solar Observatory (ASO-S) mission aims to exploretwo most spectacular eruptions in the Sun: solar flares and coronal massejections (CMEs), and their magnetism. For the studies of CMEs, the payloadLyman-alpha Solar Telescope (LST) has been proposed. It includes a traditionalwhite-light coronagraph and a Lyman-alpha coronagraph which opens a new windowto CME observations. Polarization measurements taken by white-lightcoronagraphs are crucial to derive fundamental physical parameters of CMEs. Tomake such measurements, there are two options of Stokes polarimeter which havebeen used by existing white-light coronagraphs for space missions. One uses asingle or triple linear polarizers, the other involves both a half-wave plateand a linear polarizer. We find that the former option subjects to lessuncertainty in the derived Stokes vector propagated from detector noise. Thelatter option involves two plates which are prone to internal reflections andmay have a reduced transmission factor. Therefore, the former option is adoptedas our Stokes polarimeter scheme for LST. Based on the parameters of theintended linear polarizer(s) colorPol provided by CODIXX and the half-waveplate 2-APW-L2-012C by Altechna, it is further shown that the imperfect maximumtransmittance of the polarizer significantly increases the varianceamplification of Stokes vector by at least about 50% when compared with theideal case. The relative errors of Stokes vector caused by the imperfection ofcolorPol polarizer and the uncertainty due to the polarizer assembling in thetelescope are estimated to be about 5%. Among the considered parameters, wefind that the dominant error comes from the uncertainty in the maximumtransmittance of the polarizer.

On the error analyses of polarization measurements of the white-light coronagraph aboard ASO-S