Fig. 1. Schematic diagram of sub regional sensing process

Fig. 2. Relationship between guide star overlap and defocus amount

Fig. 3. Overlapping defocused star images

Fig. 4. Segmented and spliced defocused star point image (small aberration). (a) Pre-focal energy distribution; (b) post-focal energy distribution; (c) light intensity distribution difference

Fig. 5. (a) Reconstructed wavefront and (b) original wavefront of stitching defocused star point image under small aberration

Fig. 6. Restoration effect of defocused star image stitching under small aberration. (a) Comparison of correlation function between reconstructed wavefront and original wavefront; (b) Zernike coefficient

Fig. 7. (a) Reconstructed wavefront and （b）original wavefront of stitching defocused star image under large aberration

Fig. 8. Segmented and spliced defocused star point image (large aberration). (a) Pre-focal energy distribution; (b) post-focal energy distribution; (c) light intensity distribution difference

Fig. 9. Restoration effect of defocused star image stitching under large aberration. (a) Correlation function and (b) Zernike coefficient comparison between reconstructed wavefront and original wavefront

Fig. 10. Influence of turbulence on aberration extraction at 5 cm coherence length. (a) Pre-focal energy distribution; (b) post-focal energy distribution; (c) light intensity distribution difference; (d) short exposure reconstruction wavefront (10 ms); (e) long exposure reconstruction wavefront (100 ms); (f) original wavefront

Fig. 11. (a) Simulated binary detection intensity distribution; (b) experimental site; (c) comparison of two wavefront sensing results