Fig. 1. Principle block diagram of on-orbit co-phasing alignment

Fig. 2. Co-phasing measurement precision chain

Fig. 3. Schematic diagram of rectangular spiral scanning

Fig. 4. Workflow of image point focusing

Fig. 5. Schematic of dispersed fringe sensor

Fig. 6. Principle of phase diversity algorithm

Fig. 7. Schematic diagram of hardware components of tested system

Fig. 8. Optical system of segmented telescope

Fig. 9. Image quality of optical system

Fig. 10. Segmented primary mirrors

Fig. 11. Optical design of wavefront sensing system

Fig. 12. Hardware components of wavefront sensing system

Fig. 13. Image points formed by two segmented mirrors in camera

Fig. 14. Comparison of focal plane image before and after segment-image array

Fig. 15. Maximum grayscale value detection fitting curve for image spots

Fig. 16. Image after segment-image focusing

Fig. 17. Focal plane image after segment-image stacking

Fig. 18. Dispersed fringe images acquired by DFS（before coarse-phasing）

Fig. 19. Dispersed fringe images acquired by DFS（after coarse-phasing）

Fig. 20. Segments number and slits number

Fig. 21. Comparison between theoretical PSF and acquired images

Fig. 22. Focal plane image changes before and after actuation

Fig. 23. Test result of interferometer after fine phasing