Fig. 1. Schematic of sub-aperture stitching

Fig. 2. Schematic of hinge

Fig. 3. Schematic of two-dimensional rotation stage. (a) Three-dimensional schematic diagram; (b) pitch; (c) roll; (d) schematic of sinusoidal drive

Fig. 4. First-order mode of rotation stage

Fig. 5. Layout of modal testing measuring points

Fig. 6. Bode diagram

Fig. 7. Stability of rotation stage. (a) Pitch direction; (b) roll direction

Fig. 8. Resolution measurement result of rotation stage. (a) Pitch direction; (b) roll direction

Fig. 9. Attitude measurement result for pitch directional. (a) Rotation angle of rotation stage; (b) aperture attitude parameters

Fig. 10. Attitude measurement result for roll directional. (a) Rotation angle of rotation stage; (b) aperture attitude parameters

Fig. 11. Stitching interference instrument. (a) System diagram; (b) physical diagram

Fig. 12. Tested mirror

Fig. 13. Comparison of stitching middle line and LTP. (a) Comparison of surface height; (b) comparison of slope