Abstract: To suppress stray light from the star sensor,a cylindrical deployable membrane sunshield with axial expansion was designed,including inflatable support tubes,membrane skin and vanes.The structure and material design of each component were completed.Kinematic analysis model of the membrane skin was established,and the variation process of the configurations with the dihedral angle was analyzed.The membrane skin can be folded and deployed completely by hexagonal origami pattern.The repetitive deployment precision of the sunshield was studied by experiments,including the axial and radial precision.The prototype model of the sunshield was developed,and the ground deployment test was carried out.Results showed that the sunshield was successfully deployed under the drive of the inflatable support tubes.The work provides a new technical scheme for the engineering application of large size sunshields.

Key words: membrane sunshield, inflation, origami, kinematic analysis, repetitive deployment precision