Fig. 1. Radius of Gaussian beam and error value of RMS

Fig. 2. The extraction precision of pixel in different positions of 7 pixel×7 pixel

Fig. 3. Power density of 6.5 magnitude star under different colour temperatures

Fig. 4. SNR as integration time changes under different apertures

Fig. 5. Number and probability of attitude determining stars in field of view

Fig. 6. Light path diagram

Fig. 7. Spot diagrams

Fig. 8. Distortion of centroid

Fig. 9. Geometric encircled energy

Fig. 10. Lateral color

Fig. 11. RMS of spot diameter as field of view changes

Fig. 12. Centroid shift of diffused light spot as field of view changes

Fig. 13. Accuracy test equipment

Fig. 14. Imaging spot

Fig. 15. Distribution of calibration residual error

Fig. 16. Scene of out-field stargazing

Fig. 17. Results of measurement accuracy

Fig. 18. Gray-level distribution of 6.51 magnitude star

Fig. 19. Variation curve of transmittance before and after irradiation

Fig. 20. Gray-level distribution of 6.01 magnitude star